WO2009003403A1 - Procédé et dispositif correspondant pour sélection d'un motif d'entrelaçage, et émetteur pour entrelaçage - Google Patents

Procédé et dispositif correspondant pour sélection d'un motif d'entrelaçage, et émetteur pour entrelaçage Download PDF

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Publication number
WO2009003403A1
WO2009003403A1 PCT/CN2008/071480 CN2008071480W WO2009003403A1 WO 2009003403 A1 WO2009003403 A1 WO 2009003403A1 CN 2008071480 W CN2008071480 W CN 2008071480W WO 2009003403 A1 WO2009003403 A1 WO 2009003403A1
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WIPO (PCT)
Prior art keywords
symbol
interleaving
channel quality
symbol data
channel
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PCT/CN2008/071480
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English (en)
Chinese (zh)
Inventor
Sheng Liu
Rongdao Yu
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Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2009003403A1 publication Critical patent/WO2009003403A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems

Definitions

  • the present invention relates to the field of communications, and in particular, to a selection method and apparatus suitable for interleaving in a multi-carrier system, and a transmitter for implementing interleaving. Background technique
  • the interleaving technique is usually adopted, that is, by changing the transmission order of the signals, the continuously occurring errors are decentralized, so as to correct the scattered errors by using other techniques, such as error correction coding.
  • error correction coding improves the error correction capability of the communication system.
  • interlacing is a data processing method that changes the information structure to the maximum extent without changing the information content, so that the errors concentrated in the channel transmission process are decentralized and irregularized to the utmost extent.
  • the interleaving includes a plurality of, such as bit interleaving, symbol interleaving, etc., wherein symbol interleaving refers to a process of reordering the modulated symbol sequence.
  • symbol interleaving refers to a process of reordering the modulated symbol sequence.
  • each symbol in a symbol sequence is sequentially mapped to a corresponding one of the sub-carriers, so that when the system introduces symbol interleaving, each symbol and sub-carrier can be changed by reordering the symbol sequences.
  • Mapping relations The rearrangement order of each symbol sequence corresponds to a symbol interleaving manner.
  • a symbol interleaver that changes the mapping relationship between symbols and subcarriers is often introduced in a multi-carrier communication system, and frequency selective fading is countered by selecting a symbol interleaving method.
  • Orthogonal Frequency Division Multiplexing OFDM
  • > HARQ Hybrid Automatic Repeat Request
  • Different subcarriers may have different channel gains, symbols transmitted on subcarriers with high channel gain have better reception states, and symbols transmitted on subcarriers with lower channel gain have poor reception states.
  • the error packet retransmission supported by HARQ can improve the signal-to-noise ratio (SNR) by combining the two transmissions before and after the receiver, the symbols that were last transmitted incorrectly are still mapped during retransmission. To have low channel increase On the subcarriers of the benefit, a transmission error may occur again.
  • SNR signal-to-noise ratio
  • a symbol interleaver that changes the mapping relationship between symbols and subcarriers may be introduced in the system, and a symbol interleaving manner is selected according to the number of retransmissions.
  • the principle structure of the transmitting end is as shown in FIG. 1 , and FIG. 1 is a prior art.
  • the method for selecting the symbol interleaving method in the multi-carrier communication system is specifically described below with reference to FIG. 1.
  • the specific working process of the transmitting end is as follows:
  • the encoder 110 performs error correction coding such as convolutional code, concatenated code, etc., and adds redundant bit information to the bit stream to be transmitted, so as to be able to correct the error at the receiving end by using the added redundant bit information. ;
  • bit interleaver 120 bit-interleaving is performed on the encoded bit stream, that is, the bit stream is sequentially rearranged;
  • the bit-interleaved bit data stream is mapped to different constellation points of the constellation to form a modulated symbol sequence, that is, a constellation mapping, such as 16QAM constellation modulation, which can be modulated by 4 bits.
  • a constellation mapping such as 16QAM constellation modulation, which can be modulated by 4 bits.
  • the modulated symbol sequence is buffered by the buffer 170, and the buffer 170 is used to support the system for error packet retransmission.
  • the buffer 170 is cleared;
  • the non-acknowledgment message NACK is sent, the cached content retained in the buffer 170 is used for subsequent HARQ retransmission.
  • the transmitter does not include the buffer 170; and then, in the symbol interleaver In 140, symbol constellation is performed on the constellation-mapped symbol sequence.
  • the size of the data block processed by the symbol interleaver at one time is determined according to the effective carrier number of the OFDM system.
  • the number of effective carriers of the OFDM system is 1512
  • the data block processed by the symbol interleaver at one time includes 1512 symbols. That is to say, the symbol interleaver sequentially rearranges the sequence of symbols in units of data blocks.
  • the symbol interleaving method used by the symbol interleaver 140 that is, the rearrangement order of the symbol sequences is implemented by the symbol interleaving mode selector 160.
  • the selection of the symbol interleaving mode is determined according to the number of retransmissions, that is, according to the acknowledgement/non-confirmation information (ACK/NACK) fed back by the receiving end, specifically: when the HARQ is transmitted for the first time.
  • ACK/NACK acknowledgement/non-confirmation information
  • the transmitting end randomly selects a symbol interleaving manner from the pre-defined symbol interleaving to perform symbol interleaving on the symbol sequence in the data block. If the receiving end receives the correct, the ACK information is fed back to the transmitting end, and the next data block is used. The same symbol interleaving method performs symbol interleaving. If the receiving end feeds back the NACK information, it indicates that the transmission fails, and the transmitting end needs to change the current symbol interleaving manner, and the transmitting end removes the remaining symbols. In the interleaving mode, one of the interleaving modes is arbitrarily selected as the current symbol interleaving mode. When the HARQ second transmission is performed, the original data block is symbol interleaved again, and when the receiving end feeds back the NACK information, the symbol interleaving mode is changed again, and so on. Until the receiving end can receive it correctly.
  • the symbol interleaver 140 has N preset symbol interleaving modes, each symbol interleaving mode has one symbol interleaving index number, and the symbol interleaving index number can be represented by multiple bits. For example, when N is equal to 4, two are used.
  • the bit indicates the symbol interleaving mode, for example, 00, 01, 10, and 11 respectively indicate the symbol interleaving mode index numbers 0, 1, 2, and 3.
  • the symbol interleaving mode selector 160 selects a symbol interleaving mode, the symbol interleaving mode index number corresponding to the symbol interleaving mode is input to the symbol interleaver 140.
  • the symbol-interleaved symbol sequences are sequentially mapped to different subcarriers by OFDM modulation, and transmitted.
  • one symbol corresponds to one subcarrier, so that the data blocks that are symbol-interleaved at the same time can be mapped to each subcarrier simultaneously and transmitted.
  • the symbol interleaving method only randomly selects according to the ACK/NACK information from the receiving end. That is to say, the transmitting end can only determine whether the symbol interleaving mode needs to be changed according to the receiving result of the transmission data by the receiving end, and cannot directly directly according to the receiving result.
  • the appropriate symbol interleaving method is determined, and can only be determined by multiple symbol interleaving methods by multiple retransmission experiments. Therefore, the method of selecting symbol interleaving currently needs to retransmit data multiple times, thus affecting system throughput and poor transmission performance.
  • the embodiments of the present invention provide a method for selecting an interleaving manner, which can improve system throughput.
  • Embodiments of the present invention provide an apparatus for implementing interleaving mode selection, which can improve system throughput.
  • Embodiments of the present invention provide a transmitter that implements symbol interleaving, which is capable of improving system throughput.
  • Embodiments of the present invention provide a transmitter that implements bit interleaving, which can improve system throughput.
  • the technical solution of the embodiment of the present invention is specifically implemented as follows: A method for selecting an interleaving manner, the method includes: acquiring, by a transmitting end, channel quality information; and using a channel quality information, selecting, by a transmitting end, Interweaving method.
  • An apparatus for implementing interleaving mode selection includes: an information acquiring module and an interleaving mode selecting module; And acquiring the channel quality information, and sending the channel quality information to a symbol interleaving mode selection module, where the interleaving mode selecting module is configured to select an interleaving manner by using the channel quality information.
  • a transmitter for implementing symbol interleaving the transmitter includes: a symbol interleaving selector and a symbol interleaver;
  • the symbol interleaving selector is configured to acquire channel quality information, and select a symbol interleaving manner by using the channel quality information, and send the selected symbol interleaving manner to a symbol interleaver;
  • the symbol interleaver is configured to perform symbol interleaving according to the symbol interleaving manner.
  • a transmitter for implementing bit interleaving includes: a bit interleaving selector and a bit interleaver; the bit interleaving selector And using the channel quality information, selecting a bit interleaving manner, and transmitting the selected bit interleaving manner to a bit interleaver; the bit interleaver, according to the bit interleaving manner, Perform bit interleaving.
  • DRAWINGS 1 is a schematic structural diagram of a transmitter incorporating a symbol interleaver in the prior art
  • FIG. 2 is a schematic structural diagram of a transmitter incorporating a symbol interleaver according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a bit interleaver introduced in an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a symbol interleaving mode selector in the transmitter shown in FIG. 2
  • FIG. 5 is a schematic structural diagram of a bit interleaving mode selector of the transmitter shown in FIG.
  • FIG. 6 is a schematic flowchart of a method for selecting a symbol interleaving method according to an embodiment of the present invention
  • FIG. 7 is a schematic flowchart of a method for selecting a bit interleaving method according to an embodiment of the present invention. detailed description
  • the channel condition when the interleaving mode is selected, the channel condition is considered. Specifically, the transmitting end acquires channel quality information; the transmitting end uses the obtained channel quality information to select a better interleaving manner, thereby reducing transmission errors and improving system throughput.
  • the interleaving manner in the embodiment of the present invention may be a symbol interleaving manner or a bit interleaving manner.
  • the method for selecting the symbol interleaving method and the transmitter for implementing the symbol interleaving mode are described in the multi-carrier system that does not support the error packet retransmission.
  • the embodiment of the present invention selects a symbol interleaving manner according to channel quality information
  • the channel quality information in the embodiment is a channel quality indication (CQI) of each subband fed back to the transmitting end by the receiving end, and thus,
  • the input of the 2 symbol interleaving mode selector 260 is the CQI according to each subband shown.
  • the subband includes a plurality of subcarriers
  • the subband CQI information refers to average information of a plurality of subcarriers CQI.
  • this embodiment may also select a symbol interleaving manner, or other types of channel quality information, according to other information indicating the channel quality from the receiving end, for example, SNR measurement information of the subcarrier or subband fed back to the transmitting end by the receiving end.
  • FIG. 4 is a schematic structural diagram of a symbol interleaving mode selector according to an embodiment of the present invention.
  • the symbol interleaving mode selector 360 inputs the index number corresponding to the selected symbol interleaving mode to the symbol interleaver 340.
  • the symbol interleaver 340 has N preset symbol interleaving modes, each of which has The symbol interleaving method has a symbol interleaving index number.
  • the symbol interleaver 340 triggers the selection switch according to the symbol interleaving mode index number, and strops the corresponding symbol interleaving mode.
  • the symbol The number interleaving method and its corresponding symbol interleaving index number are known.
  • the symbol interleaving mode selector of the embodiment of the present invention includes: an information acquisition module 380 and a symbol interleaving mode selection module 390;
  • the information acquiring module 380 is configured to obtain channel quality information.
  • the symbol interleaving mode selection module 390 selects the symbol interleaving method using the channel quality signal from the information acquiring module 380.
  • the symbol interleaving mode selecting module 390 includes: a first presetting unit 391, a symbol data rearranging unit 392, and a symbol interleaving mode determining unit 393;
  • the first preset unit 391 stores a correspondence relationship between the preset symbol interleaving manner and the symbol data rearrangement order
  • the symbol data rearranging unit 392 sequentially rearranges the symbol data mapped on each channel according to the channel quality information by using the channel quality information from the information acquiring module 380, and obtains a symbol data rearrangement order, and the symbol is reordered.
  • the data rearrangement sequence is sent to the symbol interleaving mode determining unit 393; the symbol interleaving mode determining unit 393 is configured to: according to the correspondence between the symbol interleaving manner preset in the first presetting unit 391 and the symbol data rearrangement order, The symbol data rearrangement order of the symbol data rearranging unit 392 determines a symbol interleaving method as the selected symbol interleaving method.
  • the symbol data rearranging unit 392 includes: a channel ordering subunit 394 and a mapping subunit 395;
  • the channel ordering sub-unit 394 sorts the channels according to the channel quality information from the information acquiring module 380 according to the channel quality, and obtains the channel quality in the order of the channel quality.
  • the channel in this embodiment is a sub-band in the multi-carrier system. Therefore, the channel quality information is the CQI information of each sub-band, and the sub-band with a higher CQI value has better channel quality. Therefore, according to the CQI information of each sub-band, the channel quality order can be obtained;
  • the pre-set symbol interleaving mode directly corresponds to a symbol data reordering sequence
  • the mapping sub-unit 372 establishes channel quality sequence and symbol data rearrangement according to a preset mapping strategy of channel and symbol data.
  • one symbol data is a plurality of symbols mapped onto one sub-band.
  • the symbol interleaving mode determining unit 393 includes: a function generating subunit; and a function generating subunit for multiplying the rearranged symbol sequence by The transposed sequence of the pre-rearranged symbol sequence is corresponding to the symbol interleaving permutation function.
  • the symbol interleaving mode selector in this embodiment may further include: an instructing module 370, where the indication module 370 indicates the symbol interleaving mode index number selected by the transmitting end according to the symbol interleaving mode index number input by the symbol interleaving mode selector 390. .
  • the receiving end knows the correspondence between the symbol interleaving index number and the symbol interleaving manner, corresponding symbol deinterleaving can be performed according to the symbol interleaving index number.
  • corresponding symbol deinterleaving can be performed according to the symbol interleaving index number.
  • other methods for indicating the symbol interleaving manner may be used.
  • FIG. 6 is a schematic flowchart of a method for selecting a symbol interleaving method according to an embodiment of the present invention, which specifically includes the following steps:
  • Step 401 The transmitting end sends a data block.
  • the data block sent by the transmitting end is a constellation-mapped symbol sequence.
  • the OFDM carrier is divided into several sub-bands in advance, and each sub-band includes several sub-carriers, because each sub-carrier transmission A symbol, thus, each sub-band can transmit symbol data composed of a plurality of symbols.
  • the OFDM system in this embodiment is divided into four sub-bands, and the data block in this embodiment is correspondingly divided into four symbol data, respectively corresponding to the four sub-bands, namely, symbol data 1, symbol data 2, and symbol data 3.
  • the sum symbol data 4 is sequentially mapped to subband 1, subband 2, subband 3, and subband 4 for transmission.
  • the transmitting end does not perform symbol interleaving when transmitting the first data block, but directly maps the symbol data obtained by constellation mapping to the sub-bands respectively, and transmits them, which may also be predefined. After selecting one of the symbol interleaving methods for symbol interleaving, the symbol data is separately mapped to the sub-band and transmitted.
  • Step 402 Obtain channel quality information fed back by the receiving end.
  • the channel quality information acquired by the transmitting end is the sub-band CQI information fed back to the transmitting end by the receiving end, that is, after receiving the data block from the transmitting end, the receiving end may according to the receiving state of the data block, etc.
  • the transmitting end feeds back channel quality information of each channel.
  • the channel ⁇ in this embodiment is defined as a subband.
  • the channel in this embodiment may also be a subcarrier of the multi-carrier system and other channels.
  • the transmitter may also obtain other types of channel quality information, for example, the sub-carrier SNR fed back to the transmitting end by the receiving end. Measurement information, channel quality information extracted from the storage area, and the like.
  • Step 403 Sort each channel according to channel quality according to channel quality information.
  • the CQIs of the sub-bands 1, sub-band 2, sub-band 3, and sub-band 4 are sequentially CQI1, CQI2, CQI3, and CQI4, and the channel quality CQI2>CQI1>CQI4>CQI3 is assumed.
  • subband 2 > subband 1 > subband 4 > subband 3 when the symbol sequence after the constellation mapping is directly transmitted, the symbol data 2 is transmitted in the subband 2 Since the channel quality of the subband 2 is the best, correspondingly, the reception state of the symbol data 2 is also the best; the symbol data 3 is transmitted in the subband 3, since the channel quality of the subband 3 is the worst, correspondingly, the symbol The reception state of data 2 is also the worst.
  • Step 404 Establish a mapping relationship between the channel quality order and the symbol data rearrangement order.
  • the symbol interleaving mode is preset to a symbol data reordering order, and the mapping relationship between the channel quality order and the symbol data rearrangement order is established according to the mapping strategy of the channel and symbol data set in advance.
  • the mapping strategy of the used channel and symbol data is: mapping the subbands with the received state difference to the subbands with good channel conditions, and mapping the subbands with good reception status to the subbands with poor channel conditions.
  • the symbol data 2 with the best reception state is mapped to the subband 3 with the worst channel quality, and the symbol with the worst reception state is received.
  • the data 3 is mapped to the sub-band 2 with the best channel quality
  • the symbol data 1 with the second best reception state is mapped to the sub-band 4 with the sub-channel quality difference
  • the symbol data 1 is mapped to the sub-band 4, for which the symbol data is required. 2 and symbol data 3 are exchanged in order, and symbol data 1 and symbol data 4 are exchanged in order.
  • the symbol data rearrangement order can be obtained: symbol data 4, symbol data 3, symbol data 2, and symbol data 1, which are to be sequentially mapped to subband 1, subband 2, subband 3, and subband 4 Symbol data 1, symbol data 2, symbol data 3, and symbol data 4, the rearrangement order is symbol data 4, symbol data 3, symbol data 2, and symbol data 1, thereby establishing a channel quality order and symbol data weight Mapping relationship of channel order:
  • the order of channel quality is: subband 2 > subband 1 > subband 4 > subband 3
  • symbol data rearrangement order is symbol data 4, symbol data 3, symbol data 2 and symbol data 1.
  • the embodiment may also define a symbol interleaving manner corresponding to a permutation function.
  • the so-called symbol interleaving permutation function is a process function for converting a symbol sequence before symbol interleaving into a symbol sequence after symbol interleaving, such as a symbol sequence before symbol interleaving.
  • the symbol sequence after symbol interleaving is B
  • the permutation function is represented as X
  • the symbol interleave permutation function corresponds to the symbol interleave permutation function.
  • Step 405 Select a mapping relationship according to the order of the channel quality and the order of the symbol data rearrangement. Symbol interleaving.
  • the symbol interleaving mode is indicated by the index number, and according to the mapping relationship obtained in step 404, one symbol sequence data 4 corresponding to the symbol data rearrangement is selected from a plurality of preset symbol interleaving methods. 3, symbol data 2 and symbol data 1 symbol interleaving mode index number. So far, the transmitting end completes the selection process of the symbol interleaving mode.
  • the method still further includes the step 406 of: the transmitting end indicating the selected symbol interleaving manner to the receiving end.
  • the symbol end interleaving index number is sent to the receiving end by the transmitting end, and the symbol interleaving mode used by the transmitting end of the receiving end is instructed, and the receiving end selects the corresponding symbol interleaving manner to solve the symbol interleaving according to the index number.
  • a method for selecting a symbol interleaving method and a transmitter for implementing a symbol interleaving method provided by the embodiments of the present invention are applicable not only to a system that does not support error packet retransmission, but also to a system that supports error packet retransmission.
  • the schematic structure of the transmitter is similar to that of FIG. 2 except that a buffer for error retransmission is added in front of the symbol interleaver.
  • the transmitter structure of the symbol interleaving method is shown in Fig. 4, and the method of selecting the symbol interleaving method is shown in Fig. 6.
  • the embodiment is applied to the system that does not support the error retransmission system.
  • the appropriate symbol interleaving mode is selected according to the channel quality indication information fed back by the receiving end, so that the symbols with the received state difference are mapped to the subcarriers with good channel quality. Or sub-band, thereby increasing the throughput of the system.
  • the channel quality indication information fed back by the receiving end is fully utilized to select an appropriate symbol interleaving manner, so that the symbol with poor reception state is obtained. It is mapped to subcarriers or subbands with good channel quality, which can improve the combining gain and reduce the number of retransmissions to improve the throughput of the system.
  • the method for selecting the bit interleaving method and the transmitter for implementing the bit interleaving mode are provided in the multi-carrier system that does not support the error packet retransmission.
  • the bit quality interleaving mode is selected according to the channel quality information
  • the channel quality information in the embodiment is the channel quality indication (CQI) of each sub-band fed back to the transmitting end by the receiving end, and thus, FIG. 3
  • the input of the mid-bit interleaving mode selector 270 is the CQI according to each sub-band as shown.
  • the subband includes a plurality of subcarriers
  • the subband CQI information refers to average value information of a plurality of subcarriers CQI.
  • this embodiment may also select a bit interleaving manner, or other types of channel quality information, according to other information indicating the channel quality from the receiving end, for example, SNR measurement information of the subcarrier or subband fed back to the transmitting end by the receiving end.
  • FIG. 5 is a schematic structural diagram of a bit interleaving mode selector according to an embodiment of the present invention.
  • the bit interleaving mode selector 470 inputs the index number corresponding to the selected bit interleaving mode to the bit interleaver 320.
  • the bit interleaver 320 has N preset bit interleaving modes, each The bit interleaving method has a bit interleaving mode index number.
  • the bit interleaver 320 triggers the selection switch according to the bit interleaving method index number, and gates the corresponding bit interleaving mode. For both the transmitting end and the receiving end, the bit interleaving mode and its corresponding bit interleaving mode index number are known.
  • the bit interleaving mode selector for implementing the embodiment of the present invention includes: an information obtaining module 480 and a bit interleaving mode selecting module 500;
  • the information obtaining module 490 is configured to obtain channel quality information.
  • the bit interleaving mode selection module 500 selects a bit interleaving scheme using the channel quality signal from the information acquisition module 490.
  • the bit interleaving mode selection module 500 includes: a second preamble unit 501, a symbol data rearrangement unit 502, and a bit interleaving mode determining unit 503;
  • the second preset unit 501 stores a preset bit interleaving manner
  • the symbol data rearranging unit 502 sequentially rearranges the bit data mapped on each channel according to the channel quality information by using the channel quality information from the information acquiring module 490 to obtain a symbol data rearrangement order, and the symbol is reordered.
  • the data rearrangement sequence is sent to the bit interleaving mode determining unit 503.
  • the bit interleaving mode determining unit 503 is configured to perform interlace modulation according to a bit interleaving manner preset in the second presetting unit 501, and map the data into symbol data.
  • the symbol data rearrangement order determines a bit interleaving method as the selected bit interleaving method.
  • the symbol data rearranging unit 502 includes: a channel ordering subunit 504 and a mapping subunit 505.
  • the channel ordering subunit 504 sorts each channel according to channel quality according to channel quality information from the information acquiring module 490, and obtains a channel correspondingly.
  • the quality of the sequence is the sub-band in the multi-carrier system. Therefore, the channel quality information is the CQI information of each sub-band, and the sub-band with a higher CQI value has better channel quality. With the CQI information, the channel quality can be obtained in good or bad order;
  • the bit interleaving mode selector in this embodiment may further include: a second indication module 480, a second finger
  • the display module 480 indicates the bit interleaving mode index number selected by the transmitting end to the receiver according to the bit interleaving mode index number input by the bit interleaving mode selector 470. Since the receiving end knows the correspondence between the bit interleaving index number and the bit interleaving manner, corresponding bit deinterleaving can be performed according to the bit interleaving manner index number. Of course, in this embodiment, in addition to the index number, other methods for indicating the bit interleaving manner may be used.
  • FIG. 7 is a schematic flowchart of a method for selecting a bit interleaving method according to an embodiment of the present invention, which specifically includes the following steps:
  • Step 701 The transmitting end sends a data block.
  • the data block sent by the transmitting end is a constellation-mapped symbol sequence.
  • the OFDM carrier is divided into several sub-bands in advance, and each sub-band includes several sub-carriers, because each sub-carrier transmission A symbol, thus, each sub-band can transmit symbol data composed of a plurality of symbols.
  • the OFDM system in this embodiment is divided into four sub-bands, and the data block in this embodiment is correspondingly divided into four symbol data, respectively corresponding to the four sub-bands, namely, symbol data 1, symbol data 2, and symbol data 3.
  • the sum symbol data 4 is sequentially mapped to subband 1, subband 2, subband 3, and subband 4 for transmission.
  • Step 702 Obtain channel quality information fed back by the receiving end.
  • the channel quality information acquired by the transmitting end is the sub-band CQI information fed back to the transmitting end by the receiving end, that is, after receiving the data block from the transmitting end, the receiving end may according to the receiving state of the data block, etc.
  • the transmitting end feeds back channel quality information of each channel.
  • the channel ⁇ in this embodiment is defined as a subband.
  • the channel in this embodiment may also be a subcarrier of the multi-carrier system and other channels.
  • the transmitter may also obtain other types of channel quality information, for example, the sub-carrier SNR fed back to the transmitting end by the receiving end. Measurement information, channel quality information extracted from the storage area, and the like.
  • Step 703 Sort each channel according to channel quality according to channel quality information.
  • the CQIs of the sub-bands 1, sub-band 2, sub-band 3, and sub-band 4 are sequentially CQI1, CQI2, CQI3, and CQI4, and the channel quality CQI2>CQI1>CQI4>CQI3 is assumed.
  • the order of the corresponding channel quality is as follows: Subband 2 > Subband 1 > Subband 4 > Subband 3.
  • the symbol data 2 is transmitted in subband 2, due to the sub-band 2
  • the channel quality of band 2 is the best, and accordingly, the reception state of symbol data 2 is also the best
  • symbol data 3 is transmitted in subband 3, since the channel quality of subband 3 is the worst, correspondingly, the symbol data 2 Receiving status Also the worst.
  • Step 704 Perform interlace modulation according to a preset bit interleaving manner, and map to symbol data.
  • Step 705 Determine a bit interleaving manner as the selected bit interleaving manner according to the symbol data rearrangement order.
  • the method still further includes the step 706: the transmitting end indicates the selected bit interleaving manner to the receiving end.
  • the bit end interleaving index number is sent to the receiving end by the transmitting end, and the bit interleaving mode used by the transmitting end of the receiving end is instructed, and the receiving end selects the corresponding bit interleaving manner to solve the bit interleaving according to the index number.
  • a method for selecting a bit interleaving method and a transmitter for implementing a bit interleaving method provided by the embodiments of the present invention are applicable not only to a system that does not support error packet retransmission, but also to a system that supports error packet retransmission.
  • the schematic structure of the transmitter is similar to that of FIG. 3 except that a buffer for error retransmission is added before the bit interleaver.
  • the structure of the transmitter implementing the bit interleaving method is as shown in FIG. 5, and the selection method of the bit interleaving method is as shown in FIG. 7.
  • the embodiment is applied to an unsupported error retransmission system.
  • the channel quality indication information fed back by the receiving end is used to select an appropriate bit interleaving manner, so that the bits with poor reception state are mapped to the subcarriers with good channel quality. Or sub-band, thereby increasing the throughput of the system.
  • the channel quality indication information fed back by the receiving end is fully utilized to select an appropriate bit interleaving mode, so that the symbol mapping of the receiving state difference is made.
  • the subcarrier or subband with good channel quality can improve the combining gain and reduce the number of retransmissions to improve the throughput of the system.
  • the channel quality indication information fed back by the receiving end is fully utilized to select an appropriate interleaving manner, so that the symbol of the receiving state difference is mapped to
  • the subcarriers or subbands with good channel quality can improve the combining gain and reduce the number of retransmissions to improve the throughput of the system.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

Procédé de sélection d'un motif d'entrelaçage, englobant les opérations suivantes: obtention par l'émetteur d'informations sur la qualité du canal, et sélection d'un motif d'entrelaçage sur base des informations recueillies sur la qualité du canal, L'invention concerne également un dispositif permettant de sélectionner un motif d'entrelaçage, comprenant une unité d'obtention d'information et une unité de sélection de motifs d'entrelaçage de symboles. La présente invention permet d'améliorer le débit.
PCT/CN2008/071480 2007-06-29 2008-06-28 Procédé et dispositif correspondant pour sélection d'un motif d'entrelaçage, et émetteur pour entrelaçage WO2009003403A1 (fr)

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CN2007101260453A CN101335732B (zh) 2007-06-29 2007-06-29 符号交织方式的选择方法、装置及实现符号交织的发射机
CN200710126045.3 2007-06-29

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CN105306166B (zh) * 2014-07-08 2018-05-04 普天信息技术有限公司 码块的接收处理方法及装置
CN104717040B (zh) * 2015-03-27 2018-02-02 东南大学 一种基于信道质量信息的自适应交织方法及装置
US10305633B2 (en) * 2016-09-19 2019-05-28 Qualcomm Incorporated Per-symbol K-bit interleaver
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