• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Different filters adapted to respective respective frequency bands can be applied in reception of a frame according to a modulation scheme used to transmit said frame. A receiver device receives (301) signals representative of a preamble of the frame, and: determines (302), from the preamble, in which frequency band is the signals useful for demodulation of said frame; selects (303) the filter to be applied in reception of said one of said set of filters, as a function of said determined frequency band.
    公开号:FR3036566A1
    申请号:FR1554503
    申请日:2015-05-20
    公开日:2016-11-25
    发明作者:Henri Teboulle；Kaveh Razazian
    申请人:Sagemcom Energy and Telecom SAS；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a selection of filter to be applied in reception of a frame, transmitted by a transmitting device to a receiving device, from among a set of filters adapted to different respective frequency bands. The present invention also relates to a possible selection of filter to be applied in transmission of said frame. Each transmission of frames from a transmitting device to a receiving device is based on a predefined frequency band usage, this frequency band may be different from one transmission to another, sometimes even in the context of sending data from the same device transmitter to the same receiver device. This is the case for example in powerline communications networks ("powerline communications network" in English) according to the G3-PLC communication standard or according to the PRIME specifications ("PoweRline Intelligent Metering Evolution" in English), where OFDM (Orthogonal Frequency Division Multiplexing) type modulation schemes are used in the context of AMM (Automated Meter Management) type power supply networks. Each modulation scheme that can be used in such an in-line carrier communication network is associated with a frequency band in which are found the signals that are useful for the demodulation operations performed by the receiver device following transmission by the transmitting device according to said transmission scheme. modulation. It is then desirable to use a filter in reception, and possibly a filter in transmission, so as to focus on the frequency band concerned. This type of transmission is also found in radiofrequency communication technologies. These frame transmissions are based on the implementation of preambles allowing the receiving device to synchronize on said frame, that is to say to be able to determine an effective start frame time. The modulation scheme used, and therefore the frequency band used, are generally predefined and known to the transmitting device and the receiving device. There may be changes in the modulation scheme during transmission, which potentially implies changes in the frequency band in which the signals useful for the demodulation operations performed by the receiver device are found. There are situations in which it is advantageous to be able to switch, from one frame to another, from one modulation scheme to another and therefore potentially from one frequency band to another, without these changes of 3036566 2 modulation are predefined, and especially without these changes are known to the receiving device. During such a frequency band change, it is desirable to adapt the filter in reception (and when present, the filter in transmission) to this frequency band change, so as to maximize the chances of success of correct demodulation in reception. The transmitting device can then react on its own to changes in the transmission channel used between the transmitting device and the receiving device, and thus increase the performance of the transmission. The transmitting device can then warn, in a frame, the receiving device that a modulation scheme change will occur and indicate, implicitly or explicitly, when this change will occur and which is the frequency band concerned. However, this requires signaling, consuming communication resources. OFDM technology makes it possible to work at high transmission rates by increasing the spectral efficiency. In the case of a flexible allocation of the spectrum 15 used, the OFDM technology makes it possible to manage the transmission rates, in order to fight against disturbances due to noise. In particular, the G3-PLC and PRIME technologies use OFDM technology and have defined several frequency bands between 10 kHz and 500 kHz, in order to optimize transmission rates and combat noise in transmissions. Conventionally, these networks according to the G3-PLC and PRIME technologies are managed with predefined spectral allocations which do not make it possible to switch quickly enough from one frequency band to another. Due to rapid changes in the transmission channel noise conditions, the communications systems must be able to change the frequency band to be used for each frame to be transmitted. Thus, the receiving device must be able, in order to modify a filtering applied in reception, to dynamically recognize which frequency band said receiving device deals with each received frame. In addition, preferably, the transmitting device must be able to dynamically modify a filter applied in transmission, as a function of the frequency band to be used for each frame to be transmitted. It is desirable to overcome these various disadvantages of the state of the art. In particular, it is desirable to provide a solution which enables the receiver device to determine, on reception of signals representative of a frame preamble, which filter to apply when receiving the frame, without the transmitting device 3036566 3 having to signal it. to the receiving device. It is particularly desirable to provide a solution that is simple to implement and low cost. The invention relates to a method for selecting a filter to be applied in reception of a frame from a first set of filters adapted to respective frequency bands, a receiver device receiving from a transmitting device signals representative of a preamble of said frame, the preamble being predefined according to a modulation scheme according to which said signals have been modulated from among a set of modulation schemes corresponding to a set of respective known demodulation schemes of the receiver device 10 and the preamble being adapted to allow the receiving device to synchronize on said frame. The method is such that the receiving device performs the following steps: determining, from the preamble signals, in which frequency band are the signals useful for a demodulation of said frame; and, selecting the filter to be applied on reception of said one of said first set of filters, as a function of said frequency band determined by the receiving device. Thus, thanks to the preamble (which, by definition, does not have to undergo demodulation operations), the receiver device is able to determine in which frequency band are the signals useful for the demodulation (of the rest) of the frame and thus apply the appropriate filter in reception of said frame. The processing performance at the receiver device, and in particular the demodulation operations, are then improved in a simple manner. According to a particular embodiment, said first set of filters is included in a delta-sigma analog-to-digital converter of said receiver device.
    [0002] According to a particular embodiment, to determine, from the preamble, in which frequency band are the signals useful for the demodulation of said frame, the receiving device performs the following steps: sampling said signals at a suitable sampling frequency the demodulation scheme operating in the highest frequency band of the set of demodulation schemes, to obtain an amount N of samples taken xn, where n is a sampling index ranging from 0 to N-1, the quantity N of samples being, in view of said sampling frequency, representative of an integration period over which the noise potentially present in said received signals is statistically zero on average; obtaining reference samples Yin 3036566 4 corresponding to a sampling of a reference preamble according to said sampling frequency, the reference samples being also of quantity N, m being a sampling index ranging from 0 to N-1; calculating a sum S such that: N-1 N-1 S = Xn.Yirt n = m = o perform a comparison of the calculated sum S with at least one predetermined value; and selecting the filter to be applied to receive the frame from said first set of filters, depending on the result of the comparison. According to a particular embodiment, in addition to selecting said filter, the receiver device selects, from the set of demodulation schemes, the demodulation scheme to be applied in reception of the frame, as a function of the result of the comparison. Thus, by virtue of the fact that the quantity N of samples is representative of an integration period over which the noise potentially present in said received signals is statistically zero on average, said noise is self-compensated in the expression of the sum S which, moreover, makes it possible to highlight a level of intercorrelation between the sampled samples and the reference samples, which consequently makes it possible to determine which modulation scheme has been applied, therefore which frequency band is concerned, and therefore which filter to apply in reception of the frame, without resorting to a specific signaling. According to a particular embodiment, the reference samples Yin are theoretical samples determined by applying theoretical sampling according to said sampling frequency on the preamble as expected for a predetermined demodulation scheme among said set of demodulation, and each said predetermined value is the result of the same calculation as the sum S for each other demodulation scheme of said set other than said predetermined demodulation scheme, and the receiver device selects the filter 25 corresponding to the calculation result giving the value the higher among said first set of filters. According to a particular embodiment, the set of demodulation schemes comprises only two demodulation schemes and said first set of filters comprises only two corresponding filters, the reference samples Yin are samples taken by the receiving device during the reception. from the last previous frame from the same transmitting device as the frame whose received signals are representative of the preamble, and the receiving device performs the comparison of the calculated sum S with a single predetermined value which is a predefined threshold, and the receiving device maintains the filter used for said last preceding frame when the sum S is greater than or equal to the predefined threshold and changes filter with respect to said last previous frame when the sum S is less than the predefined threshold. According to a particular embodiment, the set of demodulation schemes consists of a set of OFDM multi-carrier demodulation schemes. According to a particular embodiment, the method comprises a selection of a filter to be applied, by a transmitting device in transmission of said frame, among a second set of filters adapted to respective respective frequency bands, the transmitting device synchronizing with said frame so as to program the filter to be applied before the transmission of said frame, as follows: select in which frequency band are the signals resulting from a modulation of said selected frame in response to an observation of successive failures of transmission of said frame to the receiving device; selecting the filter to be applied in transmission of said frame from said second set of filters, as a function of said frequency band determined by the transmitting device; and wait for the end of transmission of any current frame while said frame is to be transmitted, before activating the filter selected by said transmitting device. According to a particular embodiment, said second set of filters is included in a delta-sigma-type digital-to-analog converter of said transmitting device. According to a particular embodiment, the transmitting device transmits each frame, and the receiving device receives each frame, in the context of online carrier communications. The invention also relates to a receiver device adapted to select a filter to be applied in reception of a frame from a set of filters adapted to respective respective frequency bands, the receiver device being adapted to receive signals representative of a preamble of said frame, the preamble being predefined according to a modulation scheme according to which said signals have been modulated from among a set of modulation schemes corresponding to a set of respective known demodulation schemes of the receiving device and the preamble being adapted to enable the receiving device to synchronize on said frame. The receiver device is such that it comprises: means for determining, from the preamble signals, in which frequency band are the signals useful for a demodulation of said frame; and means for selecting the filter to be applied on reception of said frame from said set of filters, as a function of said determined frequency band. The invention also relates to a communication system comprising a receiver device as previously mentioned, and a transmitter device adapted to select a filter to be applied in transmission of said frame, from a second set of filters adapted to respective respective frequency bands, the A transmitting device being adapted to synchronize on said frame so as to program the filter to be applied before the transmission of said frame, comprising: means for selecting in which frequency band are the signals resulting from a modulation of said frame selected in response to an observation of successive failures of transmission of said frame to the receiving device; means for selecting the filter to be applied in transmitting said frame from said second set of filters, as a function of said frequency band determined by the transmitting device; and means for waiting for the end of transmission of any current frame while said frame is to be transmitted, before activating the filter selected by said transmitting device.
    [0003] The invention also relates to a computer program, which can be stored on a storage medium and / or downloaded from a communication network, in order to be read by a processor. This computer program includes instructions for implementing the method mentioned above, when said program is executed by the processor. The invention also relates to storage means 25 comprising such a computer program. The characteristics of the invention mentioned above, as well as others, will emerge more clearly on reading the following description of an exemplary embodiment, said description being given in relation to the attached drawings, among which: FIG. schematically illustrates a communication system in which the invention can be implemented; FIG.
    [0004] 1B schematically illustrates an example of a preamble of frames transmitted in the communication system; FIG.
    [0005] 1C schematically illustrates a first example of a partial architecture of a receiver device of the communication system; FIG.
    [0006] 1D schematically illustrates a second example of a partial architecture of a receiver device of the communication system; FIG. FIG illustrates schematically an example of a partial architecture of a transmitter device of the communication system; FIG. 2 schematically illustrates another example of partial architecture of the receiver device and / or the transmitter device; FIG.
    [0007] 3A schematically illustrates an algorithm, implemented by the receiver device, for selecting a frame receiving filter; FIG.
    [0008] 3B schematically illustrates an algorithm, implemented by the receiver device, for selecting a filter in frame reception, as well as a suitable demodulation scheme; FIG. 4 schematically illustrates an algorithm, implemented by the receiver device, for selecting a frame receiving filter and a suitable demodulation scheme, according to a first particular embodiment; FIG. 5 schematically illustrates an algorithm, implemented by the receiver device, for selecting a frame receiving filter and a suitable demodulation scheme, according to a second particular embodiment; and FIG. 6 schematically illustrates an algorithm implemented by the transmitting device for selecting a transmission filter and for activating said filter synchronously with the transmission of a frame. Fig. schematically illustrates a communication system in which the invention can be implemented. The communication system includes a transmitter device 110 and a receiver device 111. The transmitter device 110 is adapted to transmit data frames to the receiver device 111 via a communication link 120. The communication link may be wireless or wired. . The following description more particularly takes the preferred example of powerline transmissions via a wired-type communication link 120, but the principles presented here also apply to transmissions of radiofrequency signals via a communication link 120 of the wireless type. The communication link 120 may also be part of a communication network interconnecting a plurality of communication devices, including the transmitter 110 and receiver 111 devices.
    [0009] The transmitter device 110 is adapted to transmit the data frames according to a modulation scheme selected from a predefined set of modulation schemes. The modulation schemes of said set act in respective frequency bands, i.e. said frequency bands contain the signals useful for the demodulation operations corresponding to the respective modulation schemes. These modulation schemes correspond to demodulation schemes to be applied by the receiver device 111 in order to be able to demodulate the data frames, and thus there is also a correspondence between said frequency bands and said demodulation schemes. Thus, the receiver device 111 has a set of demodulation schemes respectively operating in said frequency bands. The transmitter device 110 is adapted to generate the data frames so that each frame transmitted as modulated signals begins with a predefined preamble according to the modulation scheme according to which said signals have been modulated. The preamble is adapted to allow the receiving device to synchronize on said frame, that is to say to be able to determine an effective start frame time. To do this, the preamble typically comprises a plurality of successive copies of the same symbol. The content and duration of the preamble are thus predefined and depend on the modulation scheme used by the transmitting device 110 to transmit said frame to the receiver device 111. The preambles of several frames transmitted by the transmitting device 110 are identical when the same pattern of modulation is applied by the transmitter device 110 to transmit said frames to the receiver device 111, and otherwise differ. The modulation schemes applicable by the transmitting device 110, and therefore the demodulation schemes applicable by the receiver device 111, are preferably modulation schemes, respectively demodulation, OFDM type multi-carrier. An example of such a preamble, as specified in ITU Recommendation G.9903 defining the G3-PLC communication standard, is schematically illustrated in FIG.
    [0010] 1B. Thus, in FIG.
    [0011] 1B, the preamble of each frame comprises a predefined quantity of successive copies 130 of the same symbol, called SYNCP in the G3-PLC communication standard. Then follows a symbol 131 and a half-symbol 132, called SYNCM in the G3-PLC communication standard, which are in phase opposition with respect to the successive copies 130 of the SYNCP symbol. The shape of each preamble symbol is predefined according to the modulation scheme selected by the transmitting device 110. According to the G3-PLC communication standard, several modulation schemes can be applied, using OFDM type modulation, in frequency bands. Respective ones: a first thirty-six carrier modulation scheme in the CENELEC A frequency band, which ranges from approximately 35 kHz to 91 kHz; a second seventy-two-carrier modulation scheme in the FCC frequency band, which is approximately 150 kHz to 480 kHz; a third fifty-four carrier modulation scheme in the ARIB frequency band, which also ranges from approximately 150 kHz to 400 kHz; and a fourth sixteen-carrier modulation scheme in the CENELEC B frequency band, which ranges from approximately 98 kHz to 122 kHz. The communication standard G3-PLC defines in particular, for the formation of the preamble, phase shifts to be applied between the carriers used in each of these frequency bands. The transmission time of each symbol, called the symbol time, also depends on the frequency band on which the selected modulation scheme is based and therefore on the modulation scheme selected by the transmitting device 110. Thus, according to the communication standard G3- PLC, the symbol time is 640 las in the context of the first modulation scheme in the CENELEC A frequency band and 213 las in the context of the second modulation scheme in the FCC frequency band. A similar approach is found in the PRIME specifications, which also includes in its most recent version several frequency bands. A similar approach is also applicable in the context of radiofrequency signal transmission via a wireless type of communication link 120.
    [0012] Since the transmitting device 110 is able to select a modulation scheme from among a predefined set of modulation schemes, and in particular to dynamically pass (eg according to transmission condition criteria on the communication link 120) a modulation scheme to another of said set, the receiver device 111 may not know a priori which demodulation scheme to apply when said receiver device 111 receives signals from the transmitting device 110 via the communication link 120 and therefore not to know which frequency band is actually used by the transmitting device 110.
    [0013] The receiving device 111 must be adapted to determine which filter to apply in frame reception, without having been previously informed by the transmitting device 110. In other words, the receiving device 111 must select a filter adapted to the frequency band. on which rests the modulation scheme which has been applied by the transmitter device 110 (and thus the demodulation scheme to be applied by the receiver device 111). A filter adapted to a frequency band is understood to mean a filter retaining the signals in said frequency band and rendering negligible the signals outside said frequency band (with potentially a certain margin around the cut-off frequencies of the filter vis-à-vis of said frequency band). This determination of the filter is preferably accompanied by a determination of the demodulation scheme to be applied, and taking into account in particular the fact that the preamble of each frame transmitted by the transmitting device 110 may be embedded in noise. An arrangement of the receiver device 111 adapted to determine which filter to apply, without having been previously informed by the transmitting device 110, is presented below in connection with FIG.
    [0014] 1 C. An arrangement of the receiver device 111 adapted to determine which filter to apply and which demodulation scheme to apply, without having been previously informed by the transmitting device 110, is presented hereinafter with reference to FIG.
    [0015] 1D. An alternative arrangement of the receiver device 111 is also presented hereinafter with reference to FIG. 2. FIG.
    [0016] 1C schematically illustrates a first example of partial architecture of the receiver device 111, allowing the receiver device 111 to determine which filter to apply in frame reception, without having been previously informed by the transmitting device 110.
    [0017] According to the arrangement of FIG.
    [0018] 1C, the receiving device 111 comprises a reception interface RX 150 adapted to receive signals, in analog form, transmitted by the transmitting device 110 via the communication link 120. The receiving device 111 further comprises a detector module 153 adapted to detecting the preamble of each received frame from the transmitting device 110, and determining, from the detected preamble, which frequency band was used by the transmitting device 110 to transmit said frame and thus selecting which filter to apply in frame reception among a predefined set of filters.
    [0019] In a particular embodiment, the detector module 153 comprises a sampling module SAMP 151 adapted to sample the signals received by the reception interface RX 150 and supplied to it by the reception interface RX 150. SAMP sampling module 151 is adapted to perform sampling of said signals at a sampling frequency adapted to the demodulation scheme operating in the highest frequency band of all the demodulation schemes that the receiver device 111 can apply. The SAMP sampling module 151 thus makes it possible to obtain, for each received frame preamble from the transmitting device 110, a predefined quantity N of samples xn, where n is a sampling index ranging from 0 to N-1. . Samples are taken xn, since these samples are obtained from said received signals. In addition, the detector module 153 includes a SYNCH synchronization module 152 adapted to detect a preamble presence in the signals received via the RX reception interface 150 from the samples supplied by the SAMP sampling module 151, and perform a frame synchronization, that is to say determine the start times of frames and end of the preambles of said frames. An embodiment of the SYNCH timing module 152 based on a comparison with reference samples is described below in connection with FIG.
    [0020] 1D.
    [0021] The receiver device 111 further comprises a plurality of filters, one for each frequency band usable by the transmitter device 110 for modulating the signals to be transmitted to the receiver device 111. In a particular embodiment, as shown in FIG.
    [0022] 1C, the receiver device 111 comprises two FILA filters 155 and FILB 156 respectively corresponding to two distinct frequency bands that can be used by the transmitter device 110 to modulate the signals to the receiver device 111. Each filter is associated with an analog conversion function -digital. Preferably, the analog-to-digital conversion function is performed by means of an analog-digital converter 157 of the delta-sigma (also called sigma-delta) type including said filters, so that the analog-digital converter 157 integrates and quantifies the signal analogue, from the RX 150 receiving interface, into a bit frame. The analog-digital converter 157 then uses a decimation filter which filters the analog signal by increasing its resolution.
    [0023] It should be noted that the receiver device 111 can physically comprise a plurality of filters each having predefined coefficients as a function of the frequency band that said filter is supposed to isolate. In an alternative embodiment, the receiver device 111 can physically comprise a single filter and configure it with distinct predefined coefficients, and this, depending on the frequency band that said filter is supposed to isolate. It is also possible to integrate the SAMP sampling module 151 with the analog-digital converter 157. The receiving device 111 further comprises a SEL selection module 154 adapted to receive from the detector module 153 information representative of the filter selected by the detector module 153. The SEL selection module 154 is adapted to activate the frame reception filter which has been selected by the detector module 153. The detector module 153 transmits the information representative of said selected filter, so that said filter selected is activated by the SEL selection module 154 at the end of the preamble of the frame being received, that is, so that said selected filter is active for the data of said frame following the preamble. When the SEL selection module 154 activates one of said plurality of filters of the analog-to-digital converter 157, the signals received via the RX receive interface 150 are filtered by the activated filter and transmitted to a PRO 160 processor unit. receiving device 111. The processing unit PRO 160 can notably demodulate the signals received via the reception interface RX 150 from the transmitting device 110. Other treatments can be applied by the processing unit PRO 160 One embodiment of the PRO processing unit 160 is described below in connection with FIG.
    [0024] 1D. Fig.
    [0025] 1D thus schematically illustrates a second example of a partial architecture of the receiver device 111, enabling the receiver device 111 to determine which filter to apply in frame reception, without having been previously informed by the transmitting device 110.
    [0026] According to the arrangement of FIG.
    [0027] 1D, the receiver device 111 includes the RX reception interface 150 and the detector module 153 adapted to detect the preamble of each received frame from the transmitting device 110, and to determine, according to the detected preamble, which frequency band has was used by the transmitting device 110 to transmit said frame and thus select which filter to apply in frame reception from a predefined set of filters. The receiver device 111 further comprises the analog-to-digital converter 157, preferably of the delta-sigma type, including the said plurality of filters. In a particular embodiment, as shown in FIG.
    [0028] 1D, the receiver device 111 comprises the two FILA filters 155 and FILB 156 respectively corresponding to two distinct frequency bands that can be used by the transmitter device 110 to modulate the signals to the receiver device 111. The receiver device 111 furthermore comprises the module SEL selection device 154 adapted to receive from the detector module 153 the information representative of the filter 10 selected by the detector module 153. The receiver device 111 furthermore comprises, interposed between the analog-digital converter 157 and the processing unit PRO 160, another selection module SEL '154'. According to the arrangement of FIG.
    [0029] 1D, the processing unit PRO 160 comprises a plurality of demodulators, one for each demodulation scheme usable by the receiver device 111 for demodulating the signals received from the transmitting device 110. In a particular embodiment, as shown in FIG.
    [0030] 1D, the receiver device 111 comprises three demodulators DEMA 161, DEMB 162 and DEMC 163, respectively corresponding to three demodulation schemes 20 that can be used by the receiver device 111 to demodulate the signals received from the transmitting device 110. The arrangement of the FIG. .
    [0031] 1D then has two filters and three demodulators, it being understood that in this case, two demodulators correspond to separate demodulation schemes but associated with the same frequency band. This is for example the case according to the G3-PLC communication standard by applying the same filter to recover the signals in the frequency band which goes approximately from 150 kHz to 480 kHz regardless of the modulation scheme used by the transmitting device 110 among the aforementioned second modulation scheme (FCC) and the third aforementioned modulation scheme (ARIB). The demodulator to be applied in frame reception (after the preamble) is activated by the selection module SEL '154' based on information representative of the demodulator selected by the detector module 153. According to the arrangement of FIG.
    [0032] 1D, the detector module 153 includes the SAMP sampling module 151 and further comprises a COMP comparator module 152 'adapted to obtain Yin reference samples from a storage unit REF 152 ". storage REF 152 "of the detector module 153 stores reference samples Yin, these reference samples Yin corresponding to a sampling of a reference preamble according to said sampling frequency used by the sampling module SAMP 151. The reference samples Yin 5 are also of quantity N, where m is a sampling index ranging from 0 to N-1. As detailed below, the reference samples Yin are, according to the embodiment considered, either theoretical samples stored in the storage unit REF 152 ", for example in the manufacture of the receiving device 111, or samples taken by the SAMP sampling module 151 when receiving the preamble of the last previous frame received from the transmitting device 110. As for the arrangement of FIG.
    [0033] 1C, here it is also possible to integrate the SAMP sampling module 151 with the analog digital converter 157. The comparator module COMP 152 'is further adapted to calculate a sum S such that: N-1 N-1 S = Xn.Yirt n = 0 m = 0 and to perform a comparison of the calculated sum S with at least one predetermined value. As detailed below, according to the embodiment considered, there exists either one such predetermined value which corresponds to a predefined threshold Scor, or a plurality of such predetermined values which respectively correspond to other sums calculated by the comparator module COMP. 152.
    [0034] The comparator module COMP 152 'is further adapted to select, from among the set of demodulation schemes, the filter and the demodulation scheme to be applied in reception of the frame, depending on the result of the comparison. The selection module SEL '154' is then adapted to receive from the comparator module COMP 152 'the information representative of the demodulator selected by the comparator module COMP 152'. The comparator module COMP 152 'transmits the information representative of said selected filter, so that said selected filter is activated by the selection module SEL 154 at the end of the preamble of the frame being received, that is to say say, that said selected filter is active for the data of said frame following the preamble. When the SEL selection module 154 activates one of said plurality of filters of the analog-to-digital converter 157, the signals received via the RX receive interface 150 are filtered by the activated filter and transmitted to the processing unit PRO 160 via the other 3036566 15 SEL selection module '154'. The comparator module COMP 152 'also transmits the information representative of said selected demodulator, so that said selected demodulator is activated by the selection module SEL' 154 'at the end of the preamble of the frame being received, c' i.e., said selected demodulator is active for the data of said frame following the preamble. The selection module SEL '154' then transmits the samples at the output of the analog-to-digital converter 157 (hence after filtering) to the demodulator selected by the comparator module COMP 152 '. Fig. FIG. 1 illustrates schematically an example of a partial architecture of the transmitter device 110. According to the arrangement of FIG.
    [0035] 1E, the transmitting device 110 comprises a TX transmission interface 190 adapted to transmit signals, in analog form, via the communication link 120. According to the arrangement of FIG.
    [0036] 1E, the transmitter device 110 further comprises a CTRL control module 170, adapted to supply in digital form signals to be transmitted in the form of frames to the receiver device 111. The control module CTRL 170 is adapted to supply said signals in form. The TXSEL selection module 171 is adapted to route said signals in digital form to a modulator among a plurality of modulators MODA 181, MODB 182, MODC 183 of a processing unit 180 of the transmitting device 110. The modulator towards which said signals in digital form are routed is selected by the control module CTRL 170, which warns the selection module TXSEL 171. The control module CTRL 170 selects the modulation scheme, and therefore the corresponding frequency band to be applied according to reports of frame transmission failures. Similarly, the control module CTRL 170 selects a filter to be applied, as a function of said frequency band, as detailed below in relation to FIG. 6. The transmitter device 110 thus further comprises a plurality of filters, one for each frequency band usable by the transmitter device 110 for modulating the signals to be transmitted to the receiver device 111. In a particular embodiment, as shown in FIG. Fig.
    [0037] 1E, the transmitting device 110 comprises two FILA '175 and FILB' filters 176 (respectively corresponding to the FILA filters 155 and FILB 156 of the receiving device 111), respectively corresponding to two distinct frequency bands that can be used by the transmitter device 110 to modulate the signals to the receiving device 111. Each filter is associated with a digital-to-analog conversion function. Preferably, the digital-to-analog conversion function is performed by means of a delta-sigma (also called sigma-delta) type 185 digital-to-analog converter including said filters, so that the 180 sigma-delta digital-to-analog converter uses a over-sampling technique to reduce noise in the frequency band used by spreading it over a wider spectrum. The digital-to-analog converter 180 then uses an interpolation filter to perform the oversampling. The filter to be applied is selected by the control module 170 via a TXSEL selection module '171' which inputs the respective outputs of the modulators MODA 181, MODB 182, MODC 183, and routes the digital signals from the selected modulator. by the control module 170 to the selected filter. The respective outputs of the FILA '175 and FILB' filters 176 are connected to the TX transmission interface 190, so as to allow the transmission of frames, in analogue form, to the receiver device 111. It should be noted that the device Transmitter 110 may physically comprise a plurality of filters each having predefined coefficients as a function of the frequency band that said filter is supposed to isolate. In an alternative embodiment, the transmitting device 110 can physically comprise a single filter and configure it with distinct predefined coefficients, and this, as a function of the frequency band that said filter is supposed to isolate. Fig. 2 schematically illustrates another example of partial architecture of the receiver device 111 (respectively of the transmitter device 110). The receiver device 111 (respectively of the transmitter device 110) then comprises, connected by a communication bus 210: a processor or CPU ("Central Processing Unit" in English) 200; a Random Access Memory (RAM) 201; a ROM (Read Only Memory) 202; a storage unit or a storage medium reader, such as a Secure Digital (SD) card reader 203; an interface 204 enabling the receiving device 111 to receive signals from the transmitting device 110 (respectively allowing the transmitting device 110 to transmit signals to the receiving device 111), to convert them to an analog-to-digital conversion and (respectively to in the case of the transmitting device 110, make a digital analog conversion, on command, to filter them. By analogy with the arrangements of FIGS.
    [0038] 1C and 1D, the interface 204 then corresponds to the assembly formed by the reception interface RX 150, the analog-digital converter 157, and, if present, the sampling module 151. By analogy with the arrangement of FIG. FIG.
    [0039] 1E, the interface 204 then corresponds to the assembly formed by the TX transmission interface 190 and the digital-analog converter 180. The processor 200 is capable of executing instructions loaded into the RAM 201 from the ROM 202, an external memory (not shown), a storage medium (such as an SD card), or a communication network. When the receiving device 111 (respectively the transmitting device 110) is turned on, the processor 200 is able to read instructions from RAM 201 and execute them. These instructions form a computer program causing the processor 200 to implement all or part of digital processing steps 310, 330, 410, 510 described below in relation to FIGS.
    [0040] 3A, 3B, 4 and 5 (respectively of all or part of digital processing steps 610 described below in connection with Fig. 6 in the case of the transmitter device 110). All or part of the digital processing steps 310, 330, 410, 510 described hereinafter with reference to FIGS.
    [0041] 3A, 3B, 4 and 5 (respectively of all or part of digital processing steps 610 described hereinafter with reference to Fig. 6 in the case of the transmitting device 110) can be implemented in software form by execution of a set of instructions by a programmable machine, for example a DSP ("Digital Signal Processor" in English) or a microcontroller, or be implemented in hardware form by a machine or a dedicated component, for example an FPGA ("Field-Programmable" Gate Array ") or an ASIC (Application-Specific Integrated Circuit).
    [0042] FIG.
    [0043] 3A schematically illustrates an algorithm, implemented by the receiver device 111, filter selection to be applied in reception of a frame from the transmitting device 110, and among a predefined set of filters adapted to frequency bands associated with different schemes modulation devices usable by the transmitting device 110.
    [0044] In a step 301, the receiving device 111 receives signals representative of the preamble of a frame transmitted by the transmitting device 110. The preamble is predefined according to a modulation scheme according to which the signals received in step 301 have have been modulated by the transmitter device 110, and is intended to 3036566 18 allow the receiving device to synchronize on said frame. The preamble follows, for example, the format already presented in relation to FIG.
    [0045] 1B. In a next step 302, the receiver device 111 determines a frequency band in which the signal necessary for the demodulation operations to be performed by the receiver device 111 for the rest of the frame being received is determined. The preamble makes it possible to determine which modulation scheme has been used by the transmitting device 110 to transmit said frame, and therefore which demodulation scheme must be used by the receiver device 111 to demodulate said frame, and therefore which is the frequency band concerned.
    [0046] In a next step 303, the receiver device 111 selects the filter corresponding to said frequency band from among the plurality of filters available to the receiver device 111. By selecting, in frame reception, the filter adapted to the frequency band corresponding to the modulation scheme used. by the transmitting device 110 for transmitting said frame, any signals outside this frequency band are discarded, which improves the demodulation (and processing, more generally) performance at the receiver device 111. It may be noted that steps 302 and 303 can be considered as digital processing steps, grouped as 310 in FIG.
    [0047] 3A, which can then be implemented in software as well as in hardware as already mentioned. Fig.
    [0048] 3B schematically illustrates an algorithm, implemented by the receiver device 111, for selecting a filter and a demodulation scheme to be applied in reception of a frame from the transmitting device 110, from one of a predefined set respectively. of filters and a predefined set of 25 demodulation schemes. In a step 321, the receiver device 111 receives signals representative of the preamble of a frame transmitted by the transmitting device 110. The preamble is predefined according to a modulation scheme according to which the signals received at the step 321 have been modulated by the transmitter device 110, and is intended to allow the receiver device to synchronize on said frame. The preamble follows, for example, the format already presented in relation to FIG.
    [0049] 1B. The signals representative of the preamble may, however, be noisy. In a subsequent step 322, the receiving device 111 samples said received signals at a sample rate adapted to the demodulation scheme operating in the highest frequency band of the set of demodulation schemes. As already indicated, the receiving device thus obtains a quantity N of samples taken xn, where n is a sampling index ranging from 0 to N-1. The quantity N of samples is, considering said sampling frequency, representative of an integration period T on which the noise potentially present in the signals received in step 321 is statistically zero on average. By taking again the examples of modulation schemes (and therefore of demodulation) introduced in relation to FIG. 1A with reference to the G3-PLC communication standard, a sampling frequency adapted to said second FCC frequency modulation scheme is applied by the receiver device 111 in step 322, for example 1.2 MHz. In a following step 323, the receiving device 111 obtains reference samples' m corresponding to a sampling of a reference preamble according to said sampling frequency, the reference samples Yin also being of quantity N, m being then a sampling index ranging from 0 to N-1. According to a first particular embodiment, said set of demodulation schemes comprises two or more demodulation schemes applicable to reception of frames from the transmitting device 110. The reference samples' m are then theoretical samples determined by application of FIG. theoretical sampling according to said sampling frequency on the preamble as expected for a predetermined demodulation scheme among said set of demodulation schemes. This aspect is detailed below in relation to FIG. 4. According to a second particular embodiment, said set of demodulation schemes comprises only two demodulation schemes applicable in receiving frames from the transmitting device 110. For example, according to the G3-PLC communication standard, said set of demodulation schemes includes only said first modulation scheme in the CENELEC A frequency band and said second modulation scheme in the FCC frequency band. The reference samples Yin are then samples taken by the receiving device 111 when the last previous frame is received from the transmitting device 110. This aspect is detailed hereinafter with reference to FIG. 5. In a next step 324, the receiver device 111 calculates a sum S such that: N-1 N -1 S = Xn. n = 0 m = 0 In a next step 325, the receiving device 111 compares the calculated sum S with at least one predetermined value. In said first particular embodiment, the receiver device 111 performs a comparison of the calculated sum S with a predetermined value for each other demodulation scheme applicable by said receiver device 111 in reception of frames from the transmitter device 110, ie for each demodulation scheme contained in said set of demodulation schemes other than that for which the sum S has been calculated at step 324. Each said predetermined value is then the result of the same calculation as the sum S, but for each other 10 demodulation scheme applicable by said receiver device 111 in receiving frames from the transmitter device 110. This aspect is detailed below in relation to FIG. 4. In said second particular embodiment, the receiver device 111 performs a comparison of the calculated sum S with a single predetermined value, i.e., the predefined threshold S ', already mentioned. This aspect is detailed below in relation to FIG. 5. In a subsequent step 326, the receiver device 111 selects, from among the set of filters, the filter to be applied in reception of the frame, according to the result of the comparison. In addition, the receiver device 111 selects, from among the set of demodulation schemes, the demodulation scheme to be applied in reception of the frame, depending on the result of the comparison. The receiver device 111 then applies the selected filter to filter the signals following the preamble of said frame being received and applies the selected demodulation scheme to demodulate the frame transmitted by the transmitting device 110 from the filtered signals. In said first particular embodiment, the receiver device selects the filter and the demodulation scheme corresponding to the calculation result giving the highest value among the demodulation schemes applicable by the receiving device 111 in receiving frames from the device Transmitter 110. This aspect is detailed below in connection with FIG. 4. In said second particular embodiment, the receiving device 111 maintains the same filter and the same demodulation scheme as those used in receiving the last previous frame from the transmitting device 110, when the result of the calculation of the sum S is greater than or equal to the predefined threshold Scor. Otherwise, the receiver device 111 changes filter and demodulation scheme compared to those used in receiving the last previous frame 5 from the transmitting device 110. This aspect is detailed below in connection with FIG. 5. The predefined threshold Scor is set such that the calculation of the sum S for different preambles gives a result strictly less than the predefined threshold Scor and that the calculation of the sum S for identical preambles gives a result greater than or equal to predefined threshold Seo ,. The predefined threshold Scor can thus be set theoretically or experimentally. It may be noted that steps 323 to 326 can be considered as digital processing steps, grouped as 330 in FIG.
    [0050] 3B, which can then be implemented both in software form and in hardware form, as already mentioned.
    [0051] FIG. 4 schematically illustrates an algorithm, implemented by the receiver device 111 for selecting a filter and a frame reception demodulation scheme, according to said first particular embodiment. In a step 401, the receiving device 111 receives signals representative of the preamble of a frame transmitted by the transmitting device 110. The step 401 corresponds to the step 301 of FIG.
    [0052] 3A and at step 321 of FIG.
    [0053] 3B. In a subsequent step 402, the receiving device 111 samples said received signals at a sampling frequency adapted to the demodulation scheme operating in the highest frequency band of the set of demodulation schemes. Step 402 corresponds to step 322 of FIG.
    [0054] 3B.
    [0055] In a subsequent step 403, the receiver device 111 calculates the sum S for each demodulation scheme of said predefined set of demodulation schemes. Thus, the reference samples' m differ from one calculation to another of the sum S in the context of step 403. Indeed, according to the demodulation scheme considered, the reference samples Yin correspond to a sampling, according to said sampling frequency, a theoretical reference preamble which depends on the demodulation scheme considered. In a next step 404, the receiving device 111 compares the results of the sum calculations S performed at step 403 for said set of demodulation schemes. In other words, the receiver device 111 performs a comparison of the calculated sum S for one of said demodulation schemes with a predetermined value for each other demodulation scheme applicable by said receiver device 111 to receive frames from the device Transmitter 110. Receiver device 111 then selects the demodulation scheme which provides the result of calculating the highest value sum S. Indeed, since the noise potentially present in the signals received in step 401 is statistically zero average on said integration period T, the demodulation scheme which provides the result of calculating the sum S of the most value. high is the one that has the highest level of cross correlation ("cross 10 correlation" in English) between the sampling of the received signals and the sampling of the theoretical preamble. The receiver device 111 then applies the selected demodulation scheme to demodulate the frame transmitted by the transmitting device 110. Furthermore, according to the calculation result of the sum S, the receiver device 111 selects the filter adapted to the associated frequency band. in the selected demodulation scheme 15, and activate the selected filter, so as to focus on the signals in said frequency band. It may be noted that steps 403 and 404 can be considered as digital processing steps, grouped as 410 in FIG. 4, which can then be implemented in software as well as in hardware as already mentioned. Fig. 5 schematically illustrates an algorithm, implemented by the receiver device 111 for selecting a demodulation scheme, according to said second particular embodiment. In a step 501, the receiving device 111 receives signals representative of the preamble of a frame transmitted by the transmitting device 110. The step 501 corresponds to the step 301 of FIG.
    [0056] 3A and at step 321 of FIG.
    [0057] 3B. In a subsequent step 502, the receiving device 111 samples said received signals at a sampling frequency adapted to the demodulation scheme operating in the highest frequency band of the set of demodulation schemes. Step 502 corresponds to step 322 of FIG.
    [0058] 3B. In the context of the arrangement of FIG.
    [0059] 1C, the samples obtained in step 502 are stored by the comparator module COMP 152 with a view to their subsequent storage (after selection of the demodulation scheme to be applied for the frame whose signals representative of the preamble have been received at the step 501) in the storage unit REF 153. In a subsequent step 503, the receiver device 111 calculates the sum S, the reference samples Yin being obtained by sampling, at said sampling frequency, signals representative of the preamble from the last previous frame transmitted by the transmitting device 110 to the receiving device 111. In a subsequent step 504, the receiving device 111 compares the result of the calculation of the sum S with the predefined threshold Seo. In a next step 505, the receiving device 111 selects the demodulation scheme 10 to be applied, depending on the result of the comparison performed in step 504. Since only two demodulation schemes are applicable by the receiving device 111, the receiving device 111 maintains, to demodulate the frame whose signals representative of the preamble were received in step 501, the demodulation scheme used by the receiver device 111 to demodulate the last previous frame transmitted by the transmitting device 110, when the result of the calculation of the sum S is greater than or equal to the predefined threshold Seo ,. Otherwise, the receiver device 111 changes demodulation scheme, to demodulate the frame whose signals representative of the preamble have been received in step 501, with respect to the demodulation scheme used by the receiver device 111 to demodulate the last previous frame transmitted by the transmitting device 110. Indeed, if the transmitting device 110 has not changed the modulation scheme since the last previous frame transmitted by the transmitting device 110 to the receiving device 111, a high level of intercorrelation appears between the sampling the signals received at step 501 and sampling the signals representative of the preamble of the last preceding frame transmitted by the transmitting device 110, which implies that the result of the calculation of the sum S is greater than or equal to the predefined threshold Seo ,. The receiver device 111 then applies the selected demodulation scheme to demodulate the frame whose signals representative of the preamble were received at step 501. In addition, based on the result of calculating the sum S, the receiving device 111 selects the filter adapted to the frequency band associated with the selected demodulation scheme, and activates the selected filter, so as to focus on the signals in said frequency band. For the very first frame transmitted by the transmitting device 110 to the receiving device 111 (for which there are therefore no reference samples 3036566 24 Y ,,), the modulation scheme and the corresponding demodulation scheme which are applied are predefined, and the filter to be used in reception by the receiver device 111 is also (since there is a filter within the receiver device for each frequency band that can be used to enable the transmitting device 110 to modulate the signals to be transmitted to the receiver. receiver device 111). It may be noted that steps 503 to 505 can be considered as digital processing steps, grouped as 510 in FIG. 5, which can then be implemented both in software form and in hardware form, as already mentioned.
    [0060] FIG. 6 schematically illustrates an algorithm, implemented by the transmitting device 110, for selecting a transmission filter from a predefined set of filters adapted to the frequency bands associated with the different modulation schemes that can be used by the transmitting device 110, and of activation said filter synchronously with the transmission of a frame.
    [0061] In a step 601, the transmitting device makes a report of successive failures to transmit a frame to the receiving device 111 (no acknowledgment received from the receiving device 111 indicating that said receiving device 111 has received said frame). In a next step 602, the transmitting device 110, before retransmitting said frame, selects, based on the previous transmission failures of said frame, a new frequency band to be used and therefore the filter to be used in transmission. The selection of the frequency band to be used goes with the selection of a modulation scheme adapted from the previous transmission failures of said frame.
    [0062] In a next step 603, the transmitting device 110 waits for any frame possibly being transmitted by said transmitting device 110 to be fully transmitted. In a next step 604, the transmitting device 110 configures and activates the filter selected in step 602. This frame can then be transmitted, in a next step 605, by the transmitting device 110. It may be noted that steps 601 to 604 can be considered as digital processing steps, grouped as 610 in FIG. 6, which can then be implemented both in software form and in hardware form, as already mentioned.
    [0063] It should be noted that communications between the transmitting device 110 and the receiving device 111 may be implemented within a communication network. In this case, when said second particular embodiment is implemented by a recipient device such as the receiver device 111, said recipient device executes the algorithm of FIG. 5 between two successive frames transmitted by the same source device, such as the transmitting device 110, to said recipient device. This would be the case, for example, in an in-line carrier communication network compliant with the G3-PLC communication standard or the PRIME specifications.
    [0064] Note that if the applied filters are generally identical to the sending and receiving, they may also be different.
    权利要求:
    Claims (14)
    [0001]
    CLAIMS1) A method of selecting a filter to be applied in reception of a frame from a first set of filters adapted to respective respective frequency bands, a receiving device (111) receiving (301) from a transmitting device (110) ) signals representative of a preamble of said frame, the preamble being predefined according to a modulation scheme according to which said signals have been modulated from among a set of modulation schemes corresponding to a set of respective known demodulation schemes of the device receiver and the preamble being adapted to allow the receiving device to synchronize on said frame, characterized in that the receiving device performs the following steps: - determining (302), from the preamble signals, in which frequency band are the signals useful for demodulating said frame; selecting (303) the filter to be applied on reception of said frame from said first set of filters, as a function of said frequency band determined by the receiving device.
    [0002]
    2) Selection method according to claim 1, characterized in that said first set of filters is included in a delta-sigma analog-to-digital converter of said receiver device.
    [0003]
    3) Selection method according to any one of claims 1 and 2, characterized in that, to determine, from the preamble, in which frequency band are the signals useful for the demodulation of said frame, the receiving device performs the following steps: - sampling (322) the preamble signals at a sampling frequency adapted to the demodulation scheme operating in the highest frequency band of the set of demodulation schemes, to obtain a quantity N of samples taken xn, n being a sampling index ranging from 0 to N-1, the quantity N of samples being, in view of said sampling frequency, representative of an integration period over which the noise potentially present in said signals are statistically zero on average; Obtaining (323) reference samples Yin corresponding to a sampling of a reference preamble according to said sampling frequency, the reference samples being also of quantity N, m being a sampling index ranging from 0 to N-1; Calculating (324) a sum S such that: N-1 N-1 S = Xn. Yin n = 0 m = 0 - perform (325) a comparison of the calculated sum S with at least one predetermined value; and - selecting (326) the filter to be applied in reception of the frame among said first set of filters, depending on the result of the comparison. 10
    [0004]
    4) A selection method according to claim 3, characterized in that, besides selecting said filter, the receiver device selects (326), from the set of demodulation schemes, the demodulation scheme to be applied in reception of the frame, in function of the result of the comparison. 15
    [0005]
    5) A selection method according to any one of claims 3 and 4, characterized in that the reference samples Yin are theoretical samples determined by applying a theoretical sampling according to said sampling frequency on the preamble as expected for a predetermined demodulation scheme among said set of demodulation schemes, and in that each said predetermined value is the result of the same calculation as the sum S for each other demodulation scheme of said set other than said predetermined demodulation scheme, and in that the receiver device selects (404) the filter corresponding to the calculation result giving the highest value among said first set of filters.
    [0006]
    6) A method of selection according to any one of claims 3 and 4, characterized in that the set of demodulation schemes comprises only two demodulation schemes and said first set of filters comprises only two corresponding filters, the reference samples Yin are samples taken by the receiving device upon receipt of the last preceding frame from said transmitting device, and in that the receiving device 30comprises the comparison of the calculated sum S with a single predetermined value which is a threshold predefined, and in that the receiving device maintains (505) the filter used for the last preceding frame when the sum S is greater than or equal to the predefined threshold and changes (505) of filter relative to said last 5 last frame when the sum S is below the predefined threshold.
    [0007]
    7) A selection method according to any one of claims 1 to 6, characterized in that the set of demodulation schemes consists of a set of multi-carrier demodulation schemes OFDM type. 10
    [0008]
    8) Method according to any one of claims 1 to 7, characterized in that it comprises a selection of a filter to be applied by the transmitting device (110) in transmission of said frame, among a second set of adapted filters at respective respective frequency bands, the transmitting device (110) being synchronized to said frame so as to program the filter to be applied before transmission of said frame, as follows: - selecting (602) in which frequency band are the signals resulting from a modulation of said selected frame in response to an observation of successive failures of transmission of said frame to the receiving device; selecting (602) the filter to be applied in transmission of said frame from said second set of filters, as a function of said frequency band determined by the transmitting device; and - wait (603) for the end of transmission of any frame in progress while said frame 25 is to be transmitted, before activating (604) the filter selected by said transmitting device.
    [0009]
    9) Selection method according to claim 8, characterized in that said second set of filters is included in a delta-sigma type digital-to-analog converter of said transmitting device.
    [0010]
    10) A method of selection according to any one of claims 1 to 9, characterized in that the transmitting device transmits each frame, and the receiving device 3036566 receives each frame, in the context of in-line carrier communications.
    [0011]
    11) Computer program product, characterized in that it comprises instructions for implementing, by a receiving device, the method according to any one of claims 1 to 7, when said program is executed by a processor of the receiving device.
    [0012]
    12) Storage means, characterized in that they store a computer program comprising instructions for implementing, by a receiving device, the method according to any one of claims 1 to 7, when said program is executed by a processor of the receiver device.
    [0013]
    13) Receiving device (111) adapted to select a filter to be applied in reception of a frame from a first set of filters adapted to respective respective frequency bands, the receiver device being adapted to receive (301) signals representative of a preamble of said frame, the preamble being predefined according to a modulation scheme according to which said signals have been modulated from among a set of modulation schemes corresponding to a set of respective known demodulation schemes of the receiving device and the preamble being adapted to enable the receiving device to synchronize on said frame, characterized in that the receiver device comprises: - means (153) for determining (302), from the preamble signals, in which frequency band are the useful signals demodulating said frame; means (153, 154) for selecting (303) the filter to be applied in reception of said frame from said first set of filters, as a function of said frequency band determined by the receiving device. 30
    [0014]
    14) Communication system, characterized in that it comprises a receiving device according to claim 13 and a transmitting device adapted to select a filter to be applied in transmission of said frame, from a second set of filters adapted to respective respective frequency bands the transmitting device (110) being adapted to synchronize on said frame to program the filter to be applied before the transmission of said frame, comprising: - means for selecting (602) in which frequency band are located the signals resulting from a modulation of said selected frame in response to a finding of successive failures of transmission of said frame to the receiving device; means for selecting (602) the filter to be applied by transmitting said frame from said second set of filters, as a function of said frequency band determined by the transmitting device; and means for waiting for (603) the end of transmission of any current frame while said frame is to be transmitted, before activating (604) the filter selected by said transmitting device.
    类似技术:
    公开号 | 公开日 | 专利标题
    FR3036566B1|2019-07-19|METHOD FOR SELECTING A FILTER FOR APPLICATION IN RECEPTION OF A FRAME
    EP0580216B1|1999-03-10|System and receiver for orthogonal frequency division multiplexed signals provided with a frequency synchronisation circuit
    EP0441730A1|1991-08-14|Method of data broadcasting with time-frequency interleaving, using frequency reference signals
    EP0036084A1|1981-09-23|Process and device for the control of the initial adjustment of the clock of a receiver for synchronous data
    EP1330091B1|2012-07-11|Method of selecting a position of a FFT window in a COFDM receiver
    EP0881804A1|1998-12-02|Method and system for the determination of the symbol transmission format in a transmission system
    FR3046709B1|2019-06-14|RF RECEIVER WITH FREQUENCY TRACKING
    EP3266256B1|2019-01-23|Methods for transmitting data between a terminal and a frequency-synchronised access network on an uplink message from said terminal
    EP1508232A1|2005-02-23|Method and device for estimating the transfer function of a channel for the variable transmission of a multicarrier signal
    FR3006535A1|2014-12-05|METHOD AND DEVICE FOR MODULATING DELIVERING MULTIPLE CARRIER SIGNAL, DEMODULATION METHOD AND DEVICE AND CORRESPONDING COMPUTER PROGRAM.
    EP3202077B1|2020-09-16|Method of sending a multicarrier signal, method of reception, devices, and computer programs associated therewith implementing an oqam type modulation
    EP3116135A1|2017-01-11|Method for processing a signal from a transmission channel, in particular a signal carried over power line, and in particular the channel estimation, and corresponding receiver
    EP2870740A1|2015-05-13|Method for searching for a useful signal in a multiplexing band
    EP1094631B1|2006-09-27|Quest for the optimum sampling point in a TDMA packet transmission system
    EP3087695B1|2017-09-20|Selection of a subset of adjacent carriers in an ofdm system
    FR3038808A1|2017-01-13|QUADRATURE DEMODULATOR FOR HIGH-SPEED RFID RECEIVER
    EP3116181B1|2017-07-12|Rfid receiver with very high throughput
    EP2351305B1|2012-08-08|Multi state continuous phase modulation process and transmitter for this process
    EP3104566B1|2021-06-30|Method for selecting a modulation during frame transmissions by power line carriers
    EP1533907A1|2005-05-25|Method and apparatus for decoding asynchronous biphase coded data frames with variable length
    FR3022712A1|2015-12-25|SELF-ADAPTIVE DEMODULATION METHOD OF QUASI-ORTHOGONAL SIGNALS, DEMODULATION UNIT AND RADIO SIGNAL RECEIVER
    FR2916920A1|2008-12-05|METHOD FOR RECEIVING A MULTIPLEX FREQUENCY TRANSMITTED SIGNAL.
    FR2675001A1|1992-10-09|Method and device for digital modulation with components in phase and in quadrature and transmission installation including an application thereof
    EP1093267B1|2005-08-17|Frequency correction at reception in a packet transmission system
    FR3006132A1|2014-11-28|DEMODULATION METHOD AND DEMODULATOR OF A CONTINUOUS PHASE MODULE SIGNAL, AND CORRESPONDING COMPUTER PROGRAM
    同族专利:
    公开号 | 公开日
    CN106169938B|2021-08-10|
    EP3104569A1|2016-12-14|
    FR3036566B1|2019-07-19|
    CN106169938A|2016-11-30|
    EP3104569B1|2020-01-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2003015292A2|2001-08-10|2003-02-20|Adaptive Networks, Inc.|Digital equalization process and mechanism|
    US20120093198A1|2010-10-08|2012-04-19|Texas Instruments Incorporated|Building, Transmitting, and Receiving Frame Structures in Power Line Communications|CN109039378A|2018-08-16|2018-12-18|江苏林洋能源股份有限公司|A method of realizing the switching of G3-PLC network communication frequency band adaptive|CN1822518A|2005-02-17|2006-08-23|三菱电机株式会社|Distribution line carrier transmitting device|
    US8204164B1|2007-10-12|2012-06-19|Harris Corporation|Communications system using adaptive filter and selected adaptive filter taps|
    EP2131540B1|2008-06-04|2013-09-18|Sony Corporation|New frame structure for multi-carrier systems|FR3089728A1|2018-12-10|2020-06-12|Sagemcom Energy & Telecom Sas|Device for receiving PLC signals|
    FR3112258A1|2020-07-01|2022-01-07|Sagemcom Energy & Telecom Sas|WIDE BAND TRANSMISSION PROCESS BETWEEN TWO NEIGHBORING DEVICES OF A NETWORK.|
    FR3112257A1|2020-07-01|2022-01-07|Sagemcom Energy & Telecom Sas|RECEPTION PROCESS AND CHAIN FOR MODEM PLC.|
    FR3112259A1|2020-07-01|2022-01-07|Sagemcom Energy & Telecom Sas|METHOD AND DEVICE FOR TRANSMISSION OF A MESSAGE|
    FR3112260A1|2020-07-01|2022-01-07|Sagemcom Energy & Telecom Sas|TRANSMISSION PROCESS IN SEVERAL FREQUENTIAL BANDS BETWEEN TWO NEIGHBORING DEVICES IN A NETWORK.|
    法律状态:
    2016-04-21| PLFP| Fee payment|Year of fee payment: 2 |
    2016-11-25| PLSC| Publication of the preliminary search report|Effective date: 20161125 |
    2017-04-21| PLFP| Fee payment|Year of fee payment: 3 |
    2018-04-23| PLFP| Fee payment|Year of fee payment: 4 |
    2019-04-19| PLFP| Fee payment|Year of fee payment: 5 |
    2020-04-22| PLFP| Fee payment|Year of fee payment: 6 |
    2022-02-11| ST| Notification of lapse|Effective date: 20220105 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1554503A|FR3036566B1|2015-05-20|2015-05-20|METHOD FOR SELECTING A FILTER FOR APPLICATION IN RECEPTION OF A FRAME|
    FR1554503|2015-05-20|FR1554503A| FR3036566B1|2015-05-20|2015-05-20|METHOD FOR SELECTING A FILTER FOR APPLICATION IN RECEPTION OF A FRAME|
    EP16169610.9A| EP3104569B1|2015-05-20|2016-05-13|Method for selecting a filter to be applied when receiving and transmitting a frame|
    CN201610333312.3A| CN106169938B|2015-05-20|2016-05-19|Method for receiving and demodulating signal, receiving device and communication system|
    [返回顶部]