• 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:
    A multiple input multiple output (MIMO) antenna system, a signal transmission method, a signal transmission apparatus and a computer program product for the MIMO antenna system are provided. The signal transmission method comprises the following steps of transmitting a signal with a first signal transmission mode and a first transmission power via a signal transmission channel; receiving a signal to noise ratio (SNR) of the signal; receiving an interference value of the signal transmission channel; obtaining a power weight value according to the interference value; determining a system threshold of the signal transmission channel to the SNR of the signal; determining a second signal transmission mode of the signal transmission channel based on the system threshold; and determining a second transmission power of the signal transmission channel according to the power weight value.
    公开号:SE535783C2
    申请号:SE0900103
    申请日:2009-01-30
    公开日:2012-12-18
    发明作者:Hsuan-Jung Su；Wie-Shun Liao；Chia-Yi Huang；Chun-Chi Chen；Kun-Hung Lee
    申请人:Inst Information Industry；
    IPC主号:
    专利说明:

    The receiving end, so that data can be transmitted via a number of signal transmission channels to increase the data rate. In particular, a signal is divided into multiple parts at the transmission end for synchronous transmission through a plurality of antennas. Because individual parts of the signal are transmitted through different signal transmission channels, they may arrive at the receiving end at different times. To prevent failure of recombination due to different reception times of individual parts, the receiving end has a plurality of antennas for receiving these signals simultaneously. Through digital signal processing and recalculation, the separate signal parts are then recombined to the original signal quickly and correctly.
    By splitting the signal, the traffic in the individual signal transmission channel can be reduced so that the signal transmission distance can be increased. Consequently, MIMO technology has been able to speed up the signal transmission and avoid the use of additional spectrum, as well as increase the signal transmission distance. Therefore, many wireless network devices have adopted MIMO technology to meet the increasing demands on signal transmission speed and signal transmission distance. Thus, MIMO technology has become a key technology that must be used in the new generation of mobile communication systems.
    Compared to a single antenna system, a MIMO antenna system can receive a larger amount of data and consequently has a higher data rate. In the MIMO antenna system, a signal transmission channel can be established between each of the transmitting antennas at the transmitting end and a corresponding receiving antenna at the receiving end.
    Since channel states are not always the same among the signal transmission channels, wireless network device manufacturers use adaptive modulation coding (AMC) technology to transmit the split signals. With AMC technology, when a signal transmission channel is in a good state, i.e. a low signal error rate or a high signal-to-noise ratio (SNR), the signal is transmitted in a transmission mode having a higher transmission rate. Conversely, the signal is transmitted in a transmission mode that has a lower transmission rate. In this way, a better data throughput is achieved in the MIMO antenna system. Here, data retrieval is denoted as the number of correct signals received by the receiving end within a unit of time.
    To implement the AMC technology, the conventional practice is to acquire characteristics of the individual signal transmission channels through simulation or performance of practical measurements, and to predetermine a system threshold value related to the signal transmission channels. During fi er, during operation of the MIMO antenna system, a signal transmission mode will be determined for the signal transmission channels according to the predetermined system threshold value. Table 1 (below) shows the signal transmission modes against predetermined system threshold values in a conventional MIMO antenna system.
    Table 1 Modulation scheme, code rate Data rate (kBit / sec) Interval for SNR QPSK, l / 2 228 SNR <10 dB 16QAM, 1/2 462 10 dBS SNR <32 dB 64QAM, 2/3 942 SNR z 32 dB 10 15 20 25 535 783 In Table 1, the signal transmission modes (modulation scheme, code rate) are (QPSK, 1/2), (16QAM, 1/2) and (64QAM, 2/3), since the predetermined system threshold values are set to be 10 dB and 32 dB. In the conventional MIMO antenna system, if the receiving end measures an SNR for the signal transmitted via a First signal transmission channel to be 20 dB, which falls within an SNR range of 10 dB s SNR <32 dB, the transmission end can set the transmission mode of the first signal transmission channel to be (16QAM, 1/2), which corresponds to a data rate of 462 kbit / sec. If an SNR of the signal transmitted via a second signal transmission channel in the MIMO antenna system is measured to be 60 dB, which falls within an SNR range of SNR 2 32 dB, the transmission end will set the transmission mode of the second signal transmission channel to be ( 64QAM, 2/3), which corresponds to a data rate of 942 kbit / sec. The SNR of the signal transmitted via the second signal transmission channel is much higher than that of the signal transmitted via the first signal transmission channel, which means that the second signal transmission channel has a better channel state than the first signal transmission channel. The second signal transmission channel may use a higher data rate transmission mode to transmit a signal. In this way, the MIMO antenna system using AMC technology can maximize data throughput.
    However, in a realistic environment, parameters related to each signal transmission channel of a MIMO antenna system vary with time. If the related parameters for a signal transmission channel change for a period of time due to environmental changes because the corresponding system threshold value of the signal transmission channel is the same, the general data throughput of the MIMO antenna system will be adversely affected due to setting the wrong transmission mode.
    Consequently, it is important to reduce the error rate of data transmissions in a MIMO antenna system as related parameters of the signal transmission channel vary with time. SUMMARY OF THE INVENTION An object of this invention is to provide a MIMO antenna system, a signal transmission method and a computer program product for the MIMO antenna system.
    The MIMO antenna system has a first signal transmission channel and at least a second signal transmission channel. The MIMO antenna system can adjust a system threshold value related to a signal transmission mode, and a power weight value related to a signal transmission power according to channel state of the signal transmission channels to mitigate interference among the signal transmission channels and increase the data throughput of the MIMO antenna system.
    The MIMO antenna system of this invention includes a first signal transmission device and a second signal transmission device. The first signal transmission device is configured to transmit a signal with a first transmission mode and a first transmission power via the first signal transmission channel. The second signal transmission device is configured to calculate, and transmit an interference value for this first signal transmission channel and to calculate and transmit an SNR for the signal after receiving the signal. The interference value is related to a transmission power of the at least one second signal transmission channel. The first signal transmission device calculates a power weight value according to the interference value, sets a system threshold value for the first signal transmission channel according to the SNR of the signal, determines a second transmission power of the first signal transmission channel according to the power weight value, and determines a second transmission signal mode mode transmission mode. The signal transmission mode of the MIMO antenna system according to this invention comprises the following steps of: operating a first signal transmission device to transmit a signal having a first transmission mode and a first transmission power via the first signal transmission channel; operating a second signal transmission device to receive the signal; operating the second signal transmission device to calculate and transmit an interference value for the first signal transmission channel, the interference value being related to a transmission power of the at least one second signal transmission channel; operating the first signal transmission device to calculate a power weight value according to the interference value; operating the second signal transmission device to calculate and transmit an SNR for the signal; operating the first signal transmission device to set a system threshold value for the first signal transmission channel according to the SNR of the signal; operating the first signal transmission device to determine a second transmission power of the first signal transmission channel according to the power weight value; and operating the first signal transmission device to determine a second transmission mode of the first signal transmission channel according to the system threshold value.
    The invention further provides a computer program product comprising a plurality of instructions stored on a computer readable medium for the IVHMO antenna system of this invention to perform the signal transmission method described above.
    Another object of this invention is to provide a signal transmission device, a signal transmission method and a computer program product for the signal transmission device. The signal transmission device is used for a MIMO antenna system having a first signal transmission channel and at least one second signal transmission channel. The signal transmission device can adjust a system threshold value related to a signal transmission mode, and a power weight value related to a signal transmission power according to the channel state of the signal transmission channels. As a result, interference among the signal transmission channels is mitigated, thereby increasing data throughput of the MIMO antenna system. Another signal transmission device according to this invention comprises at least one transmission unit, a calculation module, a microprocessor and an adjustment module. The at least one transmission unit is configured to transmit a signal with a first transmission mode and a first transmission power via the first signal transmission channel, and to receive an SNR for the signal and an interference value for the first signal transmission channel. The calculation module is configured to calculate a power weight value according to the interference value of the first signal transmission channel. The microprocessor is configured to set a system threshold value for the first signal transmission channel according to the SNR of the signal. The adjustment module is configured to determine a second transmission mode for the first signal transmission channel according to the system threshold value, and to determine a second transmission power for the first signal transmission channel according to the power weight value. The interference value is related to a transmission power of the at least one second signal transmission channel.
    In addition, another signal transmission method according to this invention comprises the following steps: operating at least one transmission unit to transmit a signal with a first transmission mode and a first transmission power via the first signal transmission channel; operating the at least one transmission unit to receive an SNR for the signal and an interference value for the first signal transmission channel, the interference value being related to a transmission power of the at least one second signal transmission channel; operate a calculation module to calculate a power weight value according to the interference value; operating a microprocessor to set a system threshold value for the first signal transmission channel according to the SNR of the signal; and operating an adjustment module to determine a second transmission mode of the first signal transmission channel according to the system threshold value, and determining a second transmission power of the first signal transmission channel according to the power weight value. In addition, another computer program product is stored in a computer readable medium for the signal transmission device of this invention to perform the signal transmission method described above.
    In summary, the MIMO antenna system, signal transmission method, signal transmission device and computer program product of the MIMO antenna system of this invention are adapted to dynamically adjust the SNR system threshold value for the signal transmitted via the signal transmission channel, and switch among the transmission transmission mode of the signal transmission mode. This invention can further calculate the interference caused by other signal transmission channels and, based on the calculated interference, allocate a transmission effect for the signal transmission channels to mitigate data transmission errors caused by interference among the signal transmission channels and increase the data throughput of the MIMO antenna system. In this way, shortcomings of known technology are overcome.
    The detailed technology and preferred embodiments implemented for this invention are described in the following paragraphs accompanying the accompanying drawings, and it is easy for those skilled in the art to understand the features of this invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view illustrating a first embodiment of this invention; Fig. 2 is a schematic view illustrating related parameters in a MIMO antenna system according to the first embodiment; Fig. 3 is a schematic view illustrating updated related parameters in the MIMO antenna system according to the first embodiment; Fig. 4 is another schematic view illustrating updated related parameters in the MIMO antenna system according to the first embodiment; Fig. 5 is a flow chart illustrating a second embodiment of this invention; and Fig. 6 is a flow chart illustrating a third embodiment of this invention.
    DESCRIPTION OF THE PREFERRED EMBODIMENT This invention provides a MIMO antenna system, a signal transmission method, a signal transmission device and a computer program product for the MIMO antenna system. The following description of embodiments according to the invention is for illustrative purposes only, not limiting. In the following embodiments and the accompanying drawings, elements not related to this invention have been omitted from the description.
    F ig. 1 describes a first embodiment of this invention, which is a MIMO antenna system 1. In this embodiment, the MIMO antenna system is a system with a hybrid automatic retransmission request (HARQ) structure. More specifically, when receiving a signal transmitted from a transmitting end of the MIMO antenna system 1, a receiving end of the MIMO antenna system 1 determines whether the signal is correct. If the signal is determined to be correct, the receiving end returns an acknowledgment (ACK) to the transmitting end to inform that the signal has been received correctly and that no retransmission of the signal is required. On the other hand, if the signal is determined to be incorrect, the receiving end feedbacks a negative acknowledgment (NACK) to inform the transmitting end to retransmit the signal. In other examples, the MIMO antenna system 1 may be a system with some kind of feedback mechanism structure. The type of feedback mechanism structure used by the MIMO antenna system 1 is not limited in this invention.
    The MIMO antenna system 1 comprises a first signal transmission device 11 and a second signal transmission device 13. In this embodiment, the first signal transmission device 11 is a signal transmission end, since the second signal transmission device 13 is a signal receiving end. The first signal transmission device 11 comprises a number of transmission units 111, 112, 115, a calculation module 117, a microprocessor 19, an adjustment module 121 and a register 123. The second signal transmission device 13 also has a number of transmission units 131, 133, 135. Thus, a number of signal transmission channels 151, 153 and 155, respectively, are established in the MIMO antenna system 1 by the transmission units 111, 113, 115 of the first signal transmission device 11 and the transmission units 131, 133, 135 of the second signal transmission device 13.
    For the sake of simplicity, the first, second and third transmission units 11 1, 113, and 115, respectively, in this embodiment will be taken as an example to describe the transmission units of the first signal transmission device 11. The first, second and third transmission units 131, 133, 135 will be taken as an example to describe the transmission units of the second signal transmission device 13. The first, second and third signal transmission channels 151, 153, 15 will be taken as an example to describe the signal transmission channels of the MIMO antenna system 1.
    Although only three signal transmission channels 151, 153, 155 in the MIMO antenna system 1 are described in Figs. 1, the number of signal transmission channels of the MIMO antenna system is not limited in this invention. In other words, one skilled in the art can easily implement more than three signal transmission channels in the MIMO antenna system based on the above description, and thus no further description will be made herein. In this embodiment, each of the signal transmission channels 151, 153, 155 of the MIMO antenna system 1 has three transmission modes, i.e. a transmission mode (QPSK, 1/2) with a data rate of 228 kbit / sec, a transmission mode (16QAM, 1/2) with a data rate of 469 kbit / sec and a transmission mode (64QAM, 2/3) with a data rate of 924 kbit / sec. The register 123 of the first signal transmission device 11 stores a first dry-determined threshold value p1, a second dry-determined threshold value pg, a first predetermined threshold interval D; and a second predetermined threshold range DZ. The first feed-determined threshold value n; is 18 dB, the second dry-determined threshold value n; is 28 dB, and both the first dry-determined threshold interval D, and the second pre-determined threshold interval DZ are 6 dB. As can be seen in Fig. 2 and in the description above, three SNR intervals can be formed by the first predetermined threshold value p, and the second predetermined threshold value 112, i.e. 0 dB ~ 18 dB, 18 dB ~ 28 dB and from 28 dB and up. Depending on the SNR interval falling therein, the MIMO antenna system 1 transmits a signal in one of the three transmission modes. At the same time, the first predetermined threshold interval D1 and the second dry predetermined threshold interval D; defined according to the first predetermined threshold value n; and the second predetermined threshold value p; are 15 dB ~ 2l dB and 25 dB ~ 31 dB, respectively.
    More specifically, the number, types and values of the transmission modes and the predetermined threshold values are not limited in the MIMO antenna system 1 of this invention, and those skilled in the art can define the number of transmission modes and values of the predetermined thresholds in the MIMO antenna system according to existing M-O technologies. , and thus no further description will be made herein.
    Hereinafter, operations and functions of the MIMO antenna system 1 according to this invention will be described in detail. Initially, the first transmission device 11 sends a first signal 150 from the first transmission unit 111 to the second signal transmission device 13 with a first transmission mode (eg 16QAM 1/2) and a first transmission power via the thirst signal transmission system. At the same time, the first signal device 11 transmits a second signal 152 from the second transmission unit 13 to the second signal transmission device 13 via the second signal transmission channel 153. Meanwhile, the first signal device 11 transmits a third signal 154 from the third transmission the unit 115 to the second signal transmission device 13 via the third signal transmission channel 155.
    When the first, second and third signals 150, 152, 154 are transmitted, the first transmission unit 131 of the second signal transmission device 13 receives the first signal 150 via the first transmission channel 151. However, the first transmission unit 151 may further receive interference 152a from the second signal. 152 and interference 154a from the third signal 154. For example, if the second signal 152 is transmitted with too high a transmission power and / or the first signal transmission channel 151 is too close to the second signal transmission channel 153, the second signal will 152 have an effect on the first signal 150 transmitted over the first signal transmission channel 151, thus causing interference 152a.
    Similarly, if the third signal 154 is transmitted with an excessively high transmission power and / or the first signal transmission channel 151 is too close to the third signal transmission channel 155, the third signal 154 will have an effect on the first signal 150 transmitted over the first signal transmission channel 151, thus causing interference 154a.
    Similarly, in addition to the second signal 152 transmitted via the second signal transmission channel 15, the second transmission unit 133 of the second signal transmission device 13 may also receive interference (not shown) from the first signal 150 and the third signal 154. The third transmission unit 135 of the second signal transmission device 13 may also receive interference (not shown) from the first signal 150 and the second signal 152 in addition to the third signal 154 transmitted via the third signal transmission channel 155. 535 783 Upon receiving the first signal 150 via the first transmission unit 131, the second signal transmission device 13 calculates an SNR 150b for the first signal 150 and an interference value 15 lb for the first signal transmission channel 151. Generally speaking, the second signal transmission device 13 calculates and quantizes the interference. from the second signal 152 and the interference l54a fr to the third signal 154 in a physical manner to derive the interference value 151b.
    There, the second signal transmission device 13 transmits SNR 150b for the first signal 150 and the interference value 15 lb for the first signal transmission channel 151 from the first transmission unit 131 to the first signal transmission device 11. At the same time, if the second signal transmission device 13 determines that the first signal 150 is correct, the first transmission unit 131 feedbacks an ACK to the first signal transmission device 11 to inform that no retransmission of the first signal 150 is needed. Conversely, if the second signal transmission device 13 determines that the first signal 150 is incorrect, the first transmission unit 131 feedbacks a NACK to the first signal transmission device 11 to request a retransmission of the first signal 150 from the first signal transmission device 11.
    After the first transmission unit 11 of the first signal transmission device 11, SNR 150b receives the first signal 150 and the interference value 151b of the first signal transmission channel 151, the calculation module 117 calculates a power weight value 110 according to the interference value 15. 1b for the first signal transmission channel 151 by an iterative procedure. According to the power weight value 110, the adjustment module 121 allocates a second transmission power to the first signal transmission channel 151.
    More specifically, the calculation module 117 uses a water filling algorithm to calculate the power weight value 110 according to the interference value 15 lb for the first signal transmission channel 151. According to the water filling algorithm, without increasing the total transmission power of the first, second and third The signal transmission channels 151, 153, 155 of the MIMO antenna system 1 allocate signal transmission channels with lower interference values a larger transmission power, since those with higher interference values are allocated a smaller transmission power.
    For example, if the interference value 151b of the signal transmission channel 151 is less than the interference value (not shown) of the second signal transmission channel 153, the calculation module 117 will increase the power weight value 110 of the first signal transmission channel 151, and decrease the power weight value (not shown) of the second signal transmission the transmission channel 153, so that a balance in transmission power can be achieved among the first, second and third signal transmission channels 151, 153, 155 by continuous calculations with the water filling algorithm. At the same time, through the aforementioned calculation process, the interferences from the first, second and third signal transmission channels 151, 153 and 155, respectively, converge. MIMO technology, and thus will not be discussed further here.
    Upon completion of adjusting power weight values of the corresponding signal transmission channels, the adjustment module 121 determines a second transmission power of the first signal transmission channel 151 according to the power weight value 110 of the first signal transmission 151. The second transmission power of the first signal transmission channel 151 is higher than the previous signal power. , so that the first transmission unit 111 of the first signal transmission device 11 can transmit the next signal with the second transmission power. The microprocessor 119 of the first signal transmission device 11 sets a system threshold 112 for the first signal transmission channel 151 according to SNR 150b of the first signal 150. More specifically, if the transmission unit 111 of the first signal transmission device 11 receives an ACK transmitted by the first transmission unit 131 of the second signal transmission device 13, the microprocessor 119 determines whether the SNR 150b of the first signal 150 falls within the first predetermined threshold range DI or the second predetermined threshold range D; (i.e. 15 dB ~ 21 dB and 25 dB ~ 31 dB, respectively). If the SNR 150b of the first signal 150 does not fall within any of the predetermined threshold ranges, the adjustment module 121 determines a second transmission mode of the first signal transmission channel 151 according to the prior art AMC technology so that the first transmission unit III of the first signal transmission device 11 can send the next signal with the second transmission mode. On the other hand, if the SNR 150b of the first signal 150 falls within any of the predetermined threshold ranges, the microprocessor 119 determines whether the SNR 153 is less than the first predetermined threshold value u] (i.e., 18 dB) or the second predetermined threshold value u; (d v s 28 dB).
    For example, if the SNR 150b of the first signal 150 is 27 dB, the microprocessor 119 determines that the SNR 150b of the first signal 150 is less than the second predetermined threshold value p; (d v s 28 dB). In this case, the calculation module 117 of the first signal transmission device 11 acquires the second dry-determined threshold value u; from register 123 and subtracts a correction value from the second predetermined threshold value uz. Here, the correction value can be designed depending on different conditions and is not limited in this invention. In this embodiment, the correction value is set to 2 dB. The microprocessor 119 sets the system threshold 112 for the first signal transmission channel 151 to be a result of subtracting the correction value from the second predetermined threshold value ul, i.e. 26 dB. Thereafter, the calculation module 117 updates the second predetermined threshold value u; stored 10 15 20 25 535 783 16 in the register 123 to 26 dB. At the same time, the second predetermined threshold interval D is updated; to 23 dB ~ 29 dB. These updated parameters of the MIMO antenna system 1 are shown in Fig. 3.
    Here, the result falls from subtracting the correction value from the second predetermined threshold value u; (i.e., 26 dB) still within the original second predetermined threshold range D; (d v s 25 dB ~ 31 dB). Accordingly, according to the system threshold 112, the adjustment module 121 switches the transmission mode of the first signal transmission channel 151 from the first transmission mode (16QAM, 1/2) with a data rate of 462 kbit / sec to the second transmission mode (64QAM, 2/3) with a data rate of 924 kbit / sec, so that the first signal transmission unit 111 will transmit the next signal with the second transmission mode having a higher data rate and the determined second transmission power. On the other hand, if the SNR 150b of the first signal 150 is 20 dB, the microprocessor 119 determines that the SNR 150b of the first signal 150 is higher than the first predetermined threshold value u, (i.e., 18 dB). In this case, the calculation module 117 of the first signal transmission device 11 acquires the second predetermined threshold value u; from register 123 and adds a correction value to the first predetermined threshold value ul. Here, the correction value can be designed depending on different conditions and is not limited in this invention. In this embodiment, the correction value is defined to be 2 dB. The microprocessor 119 sets the system threshold 112 of the first signal transmission channel 151 to be a result of adding the correction value to the first predetermined threshold value ul, i.e. 20 dB. Thereafter, the calculation module 117 updates the first predetermined threshold value u] stored in the register 123 to 20 dB. At the same time, the first predetermined threshold interval D is updated; to 17 dB ~ 23 dB. These updated parameters for the MIMO antenna system I are shown in Fig. 4. Here, after adding the correction value to the first predetermined threshold value p; (i.e. 20 dB) the added result still falls within the original first predetermined threshold range D1 (i.e. 15 dB ~ 21 dB). Accordingly, according to the system threshold 112, the adjustment module 121 switches the transmission mode of the first signal transmission channel 151 from the first transmission mode (10QAM, 1/2), with a data rate of 462 kbps, to the second transmission mode (QPSK, I / 2). a data rate of 228 kbit / sec, so that the first signal transmission unit 111 will transmit the next signal with the second transmission mode having a lower data rate and the predetermined second transmission power.
    In general, the original first predetermined threshold value p; (18 dB) and the original second predetermined threshold value p; (28 dB) is dynamically adjusted by the calculation module 117 according to SNR 150b for the first signal 150 each time, and the aforementioned determination is made by the microprocessor 19 to reduce data transmission errors caused by setting the wrong transmission mode and opening the data feed. in the MIMO antenna system 1.
    Fig. 5 describes a second embodiment of this invention, which is a signal transmission method adapted for a MIMO antenna system, for example the MIMO antenna system 1 described in the first embodiment. The MIMO antenna system has a first signal transmission channel and at least a second signal transmission channel. More specifically, the signal transmission method according to the second embodiment can be implemented by a computer program product. When the computer program product is loaded into a computer and a number of instructions contained therein are executed, the signal transmission method according to the second embodiment will be achieved. This computer software product can be stored in a material machine readable medium, such as read only memory (ROM), an ash memory, a floppy disk, a hard disk, a CD, a mobile disk, a magnetic tape, a network accessible database , or any other storage medium having the same function and well known to those skilled in the art. The signal transmission method according to the second embodiment comprises the following steps. Initially, in step 501, a first signal transmission device transmits a signal having a first transmission mode and a first transmission power via the first signal transmission channel. Then, in step 503, a second signal transmission device receives the signal. There, in step 505, the second signal transmission device calculates and transmits an interference value for the first signal transmission channel. The interference value is related to the transmission power of the at least one second signal transmission channel. In step 507, a power weight value is calculated by using an iterative method according to the interference value. Then, in step 509, the second signal transmission device calculates and transmits an SNR for the signal. Then, in step 5 l1, it is determined whether the first signal transmission device has received an ACK for the signal from the second signal transmission device. If not, the process returns to step 501 for the first signal transmission device to continue transmitting a signal having a first transmission mode and a first transmission power via the first signal transmission channel.
    If the first signal transmission device receives an ACK for the signal from the second signal transmission device in step 511, it is determined in step 513 whether the SNR of the signal falls within a predetermined threshold range. If not, the process proceeds to step 515 without adjusting the system threshold. Conversely, if it is determined in step 513 that the SNR of the signal falls within the predetermined threshold range, the first signal transmission device determines whether the SNR of the signal is less than the predetermined threshold value in step 517. If so, in step 519, it subtracts the first signal transmission device a correction value from the predetermined threshold value and sets the system threshold value to be the subtraction result. Then, in step 521, the first signal transmission device updates the predetermined threshold value to the subtraction result. Here, the subtraction result falls within the predetermined threshold range. Finally, in step 523, a second transmission mode for the first signal transmission channel is determined according to the system threshold value, while a second transmission power is determined for the first signal channel according to the power weight value. Here, the data rate for the first transmission mode is lower than that of the second transmission mode.
    If it is determined in step 517 that the SNR of the signal is less than the predetermined threshold value, the first signal transmission device adds a correction value to the predetermined threshold value and sets the system threshold value to be the result of adding the correction value to the predetermined threshold value in step 5. , in step 527, the first signal transmission device updates the predetermined threshold value to the addition result. Here, the addition result falls within the predetermined threshold range. Finally, in step 529, a second transmission mode of the first signal transmission channel is determined according to the system threshold value, while the second transmission power is determined of the first signal transmission channel according to the power weight value. Here, a data rate for the first transmission mode is higher than that of the second transmission mode.
    In addition to the previously mentioned steps, the second embodiment can also perform all operations and functions produced in the first embodiment. The methods in which the second embodiment performs these operations and functions will be readily understood by those skilled in the art based on an explanation of the first embodiment and will thus not be discussed further herein.
    Fig. 6 describes a third embodiment of this invention, which is a signal transmission method adapted to use a signal transmission device, for example the first signal transmission device 11 of the MIMO antenna system 1 described in the first embodiment. More specifically, the signal transmission method according to the third embodiment can be implemented by a computer program product. When the computer program product is loaded into a computer and a number of instructions contained therein are executed, the signal transmission method according to the third embodiment will be performed. This computer software product may be stored in a physical machine readable medium, such as a ROM, an inne memory, a floppy disk, a hard disk, a CD, a mobile disk, a magnetic tape, a database accessible by network, or any other storage medium that has the same function and is well known to those skilled in the art.
    The signal transmission method according to the third embodiment comprises the following steps. Initially, in step 601, a transmission unit transmits a signal having a first transmission mode and a first transmission power via a first signal transmission channel. Then, in step 603, the transmission unit receives an interference value for the first signal transmission channel and an SNR for the signal, in which the interference value is related to a transmission power of at least a second signal transmission channel. Then, in step 605, a calculation module calculates a power weight value using an iterative method according to the interference value. In step 607, it is determined whether an ACK for the signal has been received. If not, the process returns to step 601, where the transmission unit continues to transmit the signal with the first transmission mode and the first transmission power via the first signal transmission channel.
    If the transmission unit receives an ACK for the signal in step 607, a microprocessor then determines in step 609 whether the SNR of the signal falls within a predetermined threshold range. If not, the process proceeds to step 611 without adjusting the system threshold. Conversely, if it is determined in step 609 that the SNR of the signal falls within the predetermined threshold range, then, in step 613, the microprocessor determines whether the SNR of the signal is less than a predetermined threshold value. If so, in step 615, a calculation module subtracts a correction value from the predetermined threshold value, and the microprocessor sets the system threshold value to be the result of the subtraction of the correction value from the predetermined threshold value. Then, in step 617, a register updates the predetermined threshold value to the subtraction result. Here, the subtraction result falls within the predetermined threshold range. Finally, in step 619, an adjustment module determines a second transmission mode for the first signal transmission channel according to the system threshold value, and determines a second transmission power for the first signal transmission channel according to the power weight value. Here, the data rate for the first transmission mode is lower than that of the second transmission mode.
    If the microprocessor determines in step 613 that the SNR of the signal is not less than the predetermined threshold value, then in step 621 the calculation module adds a correction value to the predetermined threshold value and the microprocessor sets the system threshold value to be a result of the addition of the correction value. tamed threshold. Then, in step 623, the register updates the predetermined threshold value to the addition result. Here, the addition result falls within the predetermined threshold range. Finally, in step 625, a second transmission mode for the first signal transmission channel is determined according to the system threshold value, and a second transmission power is determined for the first signal transmission channel according to the power weight value. Here, a data rate for the first transmission mode is higher than that of the second transmission mode.
    In addition to the previously mentioned steps, the third embodiment can also execute all operations and functions produced in the first embodiment. The method in which the third embodiment performs these operations and functions can be readily understood by those skilled in the art based on an explanation of the first embodiment, and thus will not be further described herein.
    According to the MIMO antenna system, and the signal transmission method, the signal transmission device and the computer program product of the MIMO antenna system according to this invention, the system threshold value can be adjusted dynamically according to an SNR of a signal and finally approach a suitable system threshold value. In addition, by using an iterative method to derive power weight value, a better balance of the interference can be achieved among the signal transmission channels. As a result, better data throughput is obtained in the MIMO antenna system. 535 783 22 The description above refers to the detailed technical content and innovative features thereof. Those skilled in the art can develop various modifications and substitutions based on the descriptions and proposals of the invention as described without departing from its characteristics. Nevertheless, although such modifications and substitutions have not been fully described in the above descriptions, they have been substantially covered by the following appended claims.
    权利要求:
    Claims (19)
    [1]
    A signal transmission method for a MIMO antenna system, the MIMO antenna system having a first signal transmission channel and at least a second signal transmission channel, the signal transmission method comprising the steps of: operating a first signal transmission device to transmit a signal with a first transmission signal and a first transmission signal. via the first signal transmission channel; operating a second signal transmission device to receive the signal; operating the second signal transmission device to calculate and transmit an interference value of the first signal transmission channel, the interference value being related to a transmission power of the at least one second signal transmission channel; operating the first signal transmission device to calculate a power weight value according to the interference value; operating the second signal transmission device to calculate and transmit a signal-to-noise ratio (SNR) of the signal; operating the first signal transmission device to receive SNR and an acknowledgment (ACK) of the signal from the second signal transmission device; operating the first signal transmission device to determine that the SMK of the signal is within a predetermined threshold range; operating the first signal transmission device to set a system threshold value for the first signal transmission channel according to the SNR of the signal; operating the first signal transmission device to determine a second transmission power for the first signal transmission channel according to the power weight value; and operating the first signal transmission device to determine a second transmission mode for the first signal transmission channel according to the system threshold value; and operating the first signal transmission apparatus to switch the first transmission mode to the second transmission mode. 10 15 20 25 30 535 783 29
    [2]
    The signal transmission method of claim 1, wherein the step of setting the system threshold value for the first signal transmission channel further comprises the steps of: operating the first signal transmission device to determine that the SNR of the signal is less than a predetermined threshold value; operating the first signal transmission device to subtract a correction value from the predetermined threshold value; operating the first signal transmission device to set the system threshold value as the subtraction result thereof; and operating the first signal transmission device to update the predetermined threshold value to the subtraction result; wherein the subtraction result falls within the predetermined threshold range.
    [3]
    The signal transmission method according to claim 1, wherein the step of setting the system threshold value of the first signal transmission channel further comprises the steps of: operating the first signal transmission device to determine that the SNR of the signal is higher than a predetermined threshold value; operating the first signal transmission device to add a correction value to the predetermined threshold value; operating the first signal transmission device to set the system threshold value as the addition result thereof; and operating the first signal transmission device to update the predetermined threshold value to the addition result; wherein the addition result falls within the predetermined threshold range.
    [4]
    A MIMO antenna system, comprising: a first signal transmission channel; at least one second signal transmission channel; 535 783 a first signal transmission device configured to transmit a signal having a first transmission mode and a first transmission power via the first signal transmission channel; and a second signal transmission device configured to calculate and transmit an interference value for the first signal transmission channel, and to calculate and transmit an SNR for the signal after receiving the signal, the interference value being related to a transmission power of the at least one second signal transmission; wherein the first signal transmission device calculates a power weight value according to the interference value, receives SNR and an acknowledgment (ACK) of the signal from the second signal transmission apparatus, determines that the SNR of the signal falls within a certain threshold range, sets a system threshold value for the first signal determines a second transmission power for the first signal transmission channel according to the power weight value, and determines a second transmission mode of the first signal transmission channel according to the system threshold value, and switches the transmission mode to the second transmission mode.
    [5]
    The MIMO antenna system of claim 4, wherein the first signal transmission device further determines whether the SNR of the signal is less than a predetermined threshold value, subtracts a correction value from the predetermined threshold value, sets the system threshold value as the subtraction result, and updates the subtractor result. - set the threshold value to the subtraction result, the subtraction result falling within the predetermined threshold range. 10 15 20 25 535 783 26
    [6]
    The MIMO antenna system of claim 4, wherein the first signal transmission apparatus further determines the SNR of the signal not less than the predetermined threshold value, adds a correction value to the predetermined threshold value, sets the system threshold value as the addition result, and updates the predetermined threshold result. - the value of the addition result, the addition result falling within the predetermined threshold range.
    [7]
    A computer program product stored on a computer readable medium for a MIMO antenna system for performing a signal transmission method, the MIMO antenna system having a first signal transmission channel and at least a second signal transmission channel, the computer program product comprising: a first instruction for a first signal transmission device transmitting a signal having a first transmission mode and a first transmission power via the first signal transmission channel; a second instruction for a second signal transmission device to receive the signal; a third instruction for the second signal transmission device to calculate and transmit an interference value for the first signal transmission channel, the interference value being related to a transmission power of the at least one second signal transmission channel; a fourth instruction for the first signal transmission device to calculate a power weight value according to the interference value; a fifth instruction for the second signal transmission device to calculate and transmit an SNR for the signal; a sixth instruction for the first signal transmission apparatus to receive SNR and an ACK for the signal from the second signal transmission apparatus; a seventh instruction for the first signal transmission apparatus to determine that the SNR of the signal is within a predetermined threshold range; 10 15 20 25 535 783 2 an eighth instruction for the first signal transmission device to set a system threshold value for the first signal transmission channel according to the SNR of the signal; a ninth instruction for the first signal transmission device to determine a second transmission power of the first signal transmission channel according to the power weight value; and a tenth instruction for the first signal transmission device to determine a second transmission mode for the first signal transmission channel according to the system threshold value, and an eleventh instruction for the first signal transmission apparatus to switch the first transmission mode to the second transmission mode;
    [8]
    The computer program product of claim 7, wherein the sixth instruction further comprises: a twelfth instruction for the first signal transmission device to determine that the SNR of the signal is less than a predetermined threshold value; a thirteenth instruction for the first signal transmission device to subtract a correction value from the predetermined threshold value; a fourteenth instruction for the first signal transmission device to set the system threshold value to the subtraction result; and a fifteenth instruction for the first signal transmission device for updating the predetermined threshold value to the subtraction result; wherein the subtraction result falls within the predetermined threshold range. 10 15 20 25 30 535 783 25 '
    [9]
    The computer program product of claim 7, wherein the sixth instruction further comprises a twelfth instruction for the first signal transmission device for determining that the SNR of the signal is higher than a predetermined threshold value; a thirteenth instruction for the first signal transmission device to add a correction value to the predetermined threshold value; a fourteenth instruction for the first signal transmission device for setting the system threshold value to the addition result; and a fifteenth instruction for the first signal transmission device for updating the predetermined threshold value to the addition result; wherein the addition result falls within the predetermined threshold range.
    [10]
    A signal transmission method for a MIMO antenna system, wherein the MIMO antenna system has a first signal transmission channel and at least a second signal transmission channel, the signal transmission method comprising the steps of: operating at least one transmission unit to transmit a signal with a first transmission mode of transmission. the first signal transmission channel; operating the at least one transmission unit to receive an SNR for the signal and an interference value for the first signal transmission channel, the interference value relating to a transmission power of the at least one second signal transmission channel; operate a calculation module to calculate a power weight value according to the interference value; operating at least the transmission unit to receive an acknowledgment of the signal; operating a microprocessor to determine that the SNR of the signal falls within a predetermined threshold range; operating the microprocessor to set a system threshold value for the first signal transmission channel according to the SNR of the signal; Operating an adjustment module to determine a second transmission power for the first signal transmission channel according to the power weight value; operate the adjustment module to switch the first transmission mode to the second transmission mode.
    [11]
    The signal transmission method of claim 10, wherein the step of setting the system threshold value for the first signal transmission channel further comprises the steps of: operating the microprocessor to determine that the SNR of the signal is less than a predetermined threshold value; operating the calculation module to subtract a correction value from the predetermined threshold value; operating the microprocessor to set the system threshold value as the subtraction result thereof; and operating the microprocessor to update the predetermined threshold value to the subtraction result; wherein the subtraction result falls within the predetermined threshold range.
    [12]
    The signal transmission method of claim 10, wherein the step of setting the system threshold value of the first signal transmission channel further comprises the steps of: operating the microprocessor to determine that the SNR of the signal is higher than a predetermined threshold value; operate the calculation module to add a correction value to the predetermined threshold value; operating the microprocessor to set the system threshold value as the addition result thereof; and operating the microprocessor to update the predetermined threshold value to the addition result; wherein the addition result falls within the predetermined threshold range. 10 15 20 25 30 535 783 30
    [13]
    The signal transmission method according to claim 10, wherein the step of determining the second transmission mode of the first signal transmission channel further comprises the step of: operating the adjustment module to switch the first transmission mode to the second transmission mode according to the system threshold value.
    [14]
    A signal transmission device for a MIMO antenna system, wherein the MIMO antenna system has a first signal transmission channel and at least a second signal transmission channel, the signal transmission device comprising: at least one transmission unit configured to transmit a signal having a first transmission mode and a first transmission mode. the signal transmission channel, receive an acknowledgment of the signal and receive an SNR for the signal and an interference value for the first signal transmission channel; a calculation module configured to calculate a power weight value according to the interference value of the first transmission channel; a microprocessor configured to determine if the SNR of the signal falls within the predetermined threshold range and set a system threshold value for the first signal transmission channel according to the SNR of the signal; and an adjustment module configured to determine a second transmission mode for the first signal transmission channel according to the system threshold value, switch the first transmission mode to the second transmission mode and determine a second transmission power for the first signal transmission channel according to the power weight value; wherein the interference value is related to a transmission power for the at least one second signal transmission channel.
    [15]
    The signal transmission device of claim 14, further comprising: a register configured to store a predetermined threshold value and a predetermined threshold range; wherein, the microprocessor further determines whether the SNR of the signal is less than the predetermined threshold value and the calculation module further subtracts a correction value from the dry-determined threshold value, where the microprocessor sets the system threshold value as the subtraction result and updates the predetermined threshold value. the result falls within the predetermined threshold range.
    [16]
    The signal transmission device of claim 14, further comprising a register configured to store a predetermined threshold value and a predetermined threshold range; wherein the microprocessor further determines when the SNR of the signal is not less than the predetermined threshold value, and the calculation module further adds a correction value to the predetermined threshold value, where the microprocessor sets the system threshold value as the addition result and updates the predetermined lag rate in the result. thereof, the addition result falling within the predetermined threshold range.
    [17]
    A computer program product stored on a computer readable medium for a signal transmission device for performing a signal transmission method, the computer program product comprising: a first instruction for at least one transmission unit for transmitting a signal having a first transmission mode and a first transmission power via a first signal transmission channel; a second instruction for the at least one transmission unit to receive an SNR for the signal and an interference value for the first transmission channel, the interference value being related to a transmission power for the at least one second signal transmission channel; a third instruction for at least the transmission unit to receive an acknowledgment of the signal; a fourth instruction for the microprocessor to determine that the SNR of the signal is less than a predetermined threshold value; a fifth instruction for a calculation module for calculating the power weight value according to the interference value; a sixth instruction for a microprocessor to set a system threshold value for the first signal transmission channel according to the SNR of the signal; and a seventh instruction for an adjustment module for determining a second transmission mode of the first signal transmission channel according to the system threshold value, and determining a second transmission power for the first signal transmission channel according to the power weight value; and an eighth instruction for the adjustment module to switch the first transmission mode to the second transmission mode.
    [18]
    The computer program product of claim 17, wherein the fourth instruction comprises: a ninth microprocessor instruction for determining that the SNR of the signal falls within a predetermined threshold range; a tenth instruction for the calculation module to subtract a correction value from the predetermined threshold value; an eleventh instruction for the microprocessor to set the system threshold value as the subtraction result thereof; and a twelfth instruction for the microprocessor to update the predetermined threshold value to the subtraction result; wherein the subtraction result falls within the predetermined threshold range. 10 535 783 33
    [19]
    The computer program product of claim 17, wherein the fourth instruction further comprises: a ninth microprocessor instruction for determining that the SNR of the signal is higher than a predetermined threshold value; a tenth instruction for the calculation module to add a correction value to the predetermined threshold value; an eleventh instruction for the microprocessor to set the system threshold value as the addition result thereof; and a twelfth instruction for the microprocessor to update the predetermined threshold value to the addition result; wherein the addition result falls within the predetermined threshold range.
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    法律状态:
    优先权:
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    TW097130589A|TWI435561B|2008-08-11|2008-08-11|Multiple input multiple output antenna system, signal transmission method, signal transmission apparatus, computer readable medium, and computer program product for the multiple input multiple output antenna system|
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