• 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:
    PURPOSE: A symbol generator for establishing synchronization, is provided to reduce a size of counter and a size of memory storing a symbol pattern establishing synchronization, by stopping an operation of the counter at an interval which does not transmit a symbol establishing synchronization for transmitting a data symbol. CONSTITUTION: A symbol generator for establishing synchronization, comprises storages(43-1-43-3), a counter(42), a channel selector(44), and a clock gator(41). The storages(43-1-43-3) stores symbol data. The counter(42) supplies a read address in the storages(42-1-42-3), and determines a size of the counter according to a channel having the most symbols in a wireless frame. The channel selector(44) selects one of output from the storages(43-1-43-3) according to a select signal in reference of channel classes. The clock gator(41) supplies a clock input terminal of the counter(42) with a symbol clock only at a pilot symbol interval.
    公开号:KR20000042687A
    申请号:KR1019980058953
    申请日:1998-12-26
    公开日:2000-07-15
    发明作者:최안나；구준모；김병무
    申请人:조정남；에스케이 텔레콤주식회사；
    IPC主号:
    专利说明:

    Synchronous Establishment Symbol Generator and Method
    The present invention relates to an apparatus and method for generating a synchronization symbol in a code division multiple access (CDMA) system. More particularly, the present invention relates to a method for determining synchronization establishment in a transceiver of a CDMA system. An apparatus and method for generating a sync symbol used for transmission and reception in a pattern.
    Synchronized symbol generator is a newly proposed component in the specification of the W-CDMA next generation mobile communication (IMT-2000) system, the actual implementation structure of this device is not yet disclosed. In general, however, the synchronization symbol generator may be configured with a symbol counter for one period of the synchronization symbol and a memory for storing the synchronization establishment symbol pattern according to the position.
    1 illustrates a physical channel signal format of a W-CDMA next generation mobile communication system.
    One radio frame is composed of a plurality of (L) time slots, each time slot is a period for transmitting a pilot symbol transmission and other control symbols or data symbols other than the pilot symbol and the synchronization symbol transmission period is possible Divided. The size of the pilot symbol transmission interval and the interval for transmitting symbols other than the pilot symbol may be variously given according to the type of channel.
    The synchronization establishment symbol is transmitted in a pilot symbol transmission interval, and has a predetermined pattern between the transceivers and is used as a basis for determining whether frame synchronization is established. The synchronization establishment symbol pattern is repeated every one frame, and is divided and transmitted in pilot symbol transmission intervals of L time slots.
    By transmitting the synchronization establishment symbol in the pilot symbol interval, the phase of the transmission signal in this interval is changed in symbol units according to the synchronization establishment symbol. Therefore, a phase estimator or a correlator of a power estimation apparatus that needs to use a pure pilot symbol having a constant transmission phase needs to compensate for this by using a predetermined synchronization establishment symbol pattern. This may be implemented using a method of converting a sign of a correlation code used in a correlator of a receiver according to a synchronization establishment symbol pattern. Fig. 2 is a block diagram of a code conversion device for a correlation code using such a sync establishment symbol, in which 21 is a code generator, 22 is a synchronization symbol generator, 23 is a code conversion device, and 24 is a correlator.
    The code conversion device 23 converts the code output from the code generation device 21 according to the symbol output from the synchronization establishment symbol generation device 22. The correlation code generated in this manner is used to output a correlation signal of the signal input from the correlator 24 of the receiver. Through this process, the receiver can obtain the same correlation signal as when transmitting a pure pilot symbol.
    FIG. 3 is a block diagram of a synchronization symbol generation apparatus implemented in this manner, in which 31 is an N-count counter, 32-1 to 32-M is a memory, and 33 is a channel selector, respectively.
    Since the synchronization symbol is repeated every one radio frame and is not caused by any regularity like other codes, it requires a memory capable of representing a symbol pattern of one entire radio frame period. When using a structure that simply determines whether the correlation code is inverted in code units, a memory corresponding to the number of codes in one radio frame is required.
    That is, as shown in FIG. 3, a counter 31 is provided which operates as a code unit clock at one radio frame, and outputs the counter 31 to read addresses of the memories 32-1 to 32-M. In this way, the synchronization symbol generator can be configured by reading a value of the stored memory.
    At this time, the size of the counter 31 used and the size of the memories 32-1 to 32-M correspond to the number of codes N in one radio frame period and are constant regardless of the channel type. However, since the patterns stored in the memory differ according to the channel type, separate memory (M) 32-1 to 32-M must exist according to the channel type. In addition, a channel selector 33 is required to select the output according to the channel type. In fact, the number of channels required by the specification of the next generation mobile communication system is 8 or more, and the number of codes in the radio frame period corresponding to the 5 MHz band is 40960.
    That is, when the synchronization symbol generation device is implemented in this manner, the size of the memory should be 40960 or more, and at least eight such memory types are required. As a result, since the circuit becomes large and requires a lot of memory when the synchronization symbol generator is implemented, there is a problem of increasing the manufacturing cost.
    Accordingly, the present invention devised to solve the above problems of the prior art, by stopping the operation of the counter in the interval that does not transmit the synchronization establishment symbol for data symbol transmission, reducing the size of the counter as well as the synchronization establishment symbol An object of the present invention is to provide a synchronization symbol generator and a method for reducing the size of a memory storing a pattern.
    1 is a radio channel signal format diagram of a code division multiple access (CDMA) system.
    2 is a configuration diagram of a code conversion device of a correlation code using a synchronization establishment symbol.
    3 is a block diagram of a device for generating a synchronization symbol operating in code units according to the present invention;
    4 is a block diagram of an apparatus for generating a synchronization symbol according to the present invention;
    * Explanation of symbols for the main parts of the drawings
    41: clock gator
    42: N-coin counter
    43-1 to 43-3: memory
    44: channel selector
    A symbol generating apparatus according to the present invention for achieving the above object, a plurality of storage means for storing the symbol data; Counting means for providing a read address to said storage means; Channel selection means for selecting one of outputs of the plurality of storage means in accordance with a selection signal according to a channel type; And clock gating means for providing a symbol clock to a clock input terminal of the counting means only in a pilot symbol period.
    In addition, the apparatus for generating a synchronization symbol according to the present invention for achieving the above object includes generating a synchronization symbol applied to an apparatus including a plurality of memories for storing symbol data and a channel selector for selecting an output of the plurality of memories. In the method, generating an address for reading symbol data stored in the plurality of memories only in a transmission period of a pilot symbol, reading the stored symbol data, and then selecting one of the read symbol data according to a channel type. It features.
    The synchronization establishment symbol is not actually changed in units of codes but in units of symbols. Therefore, when the structure for determining whether the correlation code is inverted in units of symbols, the size of the required counter and the size of the memory can be reduced somewhat. That is, the apparatus for synchronizing establishment symbol can be configured in such a manner that a counter is provided which operates as a symbol unit clock every cycle of the radio frame, and that the stored memory value is read using the counter output as a read address. In this case, the size of the counter and the size of the memory used correspond to the number of symbols in one radio frame period, and are variously given according to the type of channel. Therefore, in order to implement one counter regardless of the type of channel, the counter may be implemented according to the channel having the largest number of symbols in one radio frame, and then a part of the counter may be selected and used according to the type of channel. In this case as well, since the patterns stored in the memory differ according to the channel type, a separate memory is required according to the channel type.
    In the present invention, the operation of the counter is stopped in the period in which the synchronization establishment symbol is not transmitted to transmit the control symbol or the data symbol, and the counter is operated only in the pilot symbol period in which the synchronization establishment symbol is actually transmitted, thereby significantly reducing the size of the counter. In addition, the size of the memory storing the synchronization establishment symbol pattern can be reduced.
    Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
    Fig. 4 is a block diagram of a synchronization symbol generator according to the present invention, in which 41 is a clock gate, 42 is an N-counter, 43-1 to 43-3 is a memory, and 44 is a channel selector.
    The clock gate 41 passes the symbol clock used for the operation of the N-counter 42 only in the pilot symbol transmission period, and blocks the symbol clock in the symbol transmission period other than the pilot symbol. The clock gate 41 may be simply implemented by an AND gate that ANDs the symbol clock and the pilot symbol interval selection signal.
    The N-ary counter 42 outputs a count value according to the clock inputted through the clock gate 41, and the output value of the N-based counter 42 is used as an address for reading data stored in the memory.
    The channel selector 44 selects and outputs symbol data output from each of the memories 43-1 to 43-3 according to the selection control signal according to the channel type.
    By doing so, a counter of a size corresponding to the number of pilot symbols existing in one radio frame can be used to select an address of the memory. According to the present invention, even if the number of data symbols in one period is different when the channel types are different, the synchronization establishment symbol pattern storage memory can be shared when the number of pilot symbols used for synchronization establishment symbol transmission is the same. There is an advantage. Indeed, if only 64 binary counters and three types of memory having sizes of 64, 32, and 16 are needed, a synchronization generating device for all channels required by the next generation mobile communication (IMT-2000) standard can be implemented.
    The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.
    According to the present invention as described above it is possible to significantly reduce the number of hardware, such as memory and counters required for the implementation of the synchronization symbol generator, which is an essential component of the transceiver of the mobile communication system, to increase the integration circuit implementation and to greatly increase the implementation cost There is a saving effect.
    权利要求:
    Claims (4)
    [1" claim-type="Currently amended] A plurality of storage means for storing symbol data;
    Counting means for providing a read address to said storage means;
    Channel selection means for selecting one of outputs of the plurality of storage means in accordance with a selection signal according to a channel type; And
    Clock gating means for providing a symbol clock to the clock input of said counting means only in a pilot symbol period;
    Synchronization establishment symbol generation apparatus comprising a.
    [2" claim-type="Currently amended] The method of claim 1,
    And the counting means is configured to determine the size of the counter according to the channel having the largest number of symbols in a radio frame.
    [3" claim-type="Currently amended] The method of claim 1,
    And the clock gating means comprises logical AND means for ANDing the symbol clock and the pilot symbol interval selection signal.
    [4" claim-type="Currently amended] A method of generating a synchronized symbol applied to an apparatus including a plurality of memories for storing symbol data and a channel selector for selecting an output of the plurality of memories, the method comprising:
    A method for generating a synchronization symbol that generates an address for reading symbol data stored in the plurality of memories only in a transmission period of a pilot symbol, reads the stored symbol data, and then selects one of the read symbol data according to a channel type. .
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1998-12-26|Application filed by 조정남, 에스케이 텔레콤주식회사
    1998-12-26|Priority to KR1019980058953A
    1998-12-26|Priority claimed from KR1019980058953A
    2000-07-15|Publication of KR20000042687A
    2002-07-18|Application granted
    2002-07-18|Publication of KR100340027B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019980058953A|KR100340027B1|1998-12-26|Apparatus and Method for Generation of Symbol for Synchronous Establishment|
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