WO2009003403A1

WO2009003403A1 - Method and corresponding device for selecting the interleave pattern, and transmitter for interleaving

Info

Publication number: WO2009003403A1
Application number: PCT/CN2008/071480
Authority: WO
Inventors: Sheng Liu; Rongdao Yu
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-06-29
Filing date: 2008-06-28
Publication date: 2009-01-08
Also published as: CN101335732A; CN101335732B

Abstract

The present invention claims a method for selecting the interleave pattern, and it includes following steps, the transmitter obtains the channel quality information, and selects the interleave pattern based on the channel quality information. The present invention also claims a device for selecting the interleave pattern, and it includes information obtain section and symbol interleave pattern selecting section. Throughput can be improved based on the present invention.

Description

Method, device and interleaving transmitter for interleaving method

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

In a communication system, due to the complexity of the channel, such as multipath fading due to reflection from buildings or the like, the level of the received signal varies greatly with time, and communication transmission errors are usually sudden. The form appears in a concentrated manner, so at the receiving end, the error occurs in a continuous form in the received signal. In order to avoid information distortion caused by continuous error, 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. Improve the error correction capability of the communication system. In essence, the so-called 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. In a multi-carrier communication system, 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.

In the Orthogonal Frequency Division Multiplexing (OFDM) system supporting the > HARQ (Hybrid Automatic Repeat Request), due to the fading selectivity of the OFDM system, 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. Although 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. In order to solve the above problem, 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. A schematic diagram of the principle structure of a transmitter incorporating a symbol interleaver.

The method for selecting the symbol interleaving method in the multi-carrier communication system is specifically described below with reference to FIG. 1. Referring to FIG. 1, the specific working process of the transmitting end is as follows:

First, 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. ;

Next, in the bit interleaver 120, bit-interleaving is performed on the encoded bit stream, that is, the bit stream is sequentially rearranged;

Then, in the modulation module 130, 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. Give out a symbol;

The modulated symbol sequence is buffered by the buffer 170, and the buffer 170 is used to support the system for error packet retransmission. When the transmitting end receives the acknowledgement message ACK sent by the receiving end, the buffer 170 is cleared; When the non-acknowledgment message NACK is sent, the cached content retained in the buffer 170 is used for subsequent HARQ retransmission. For systems that do not support the error packet 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. Generally, 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. For example, the number of effective carriers of the OFDM system is 1512, and then 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. In 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. 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. After 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.

Finally, in the OFDM transmitting module 150, the symbol-interleaved symbol sequences are sequentially mapped to different subcarriers by OFDM modulation, and transmitted. Usually, 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.

In the process of implementing the present invention, the inventors have found that the prior art has the following disadvantages:

At present, 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. . Summary of the invention

In view of this, 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. In order to achieve the above first object, 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.

In order to achieve the second object, the technical solution of the embodiment of the present invention is specifically implemented as follows: An apparatus for implementing interleaving mode selection, the apparatus 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. In order to achieve the third object, the technical solution of the embodiment of the present invention is specifically implemented as follows: 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.

In order to achieve the fourth object, the technical solution of the embodiment of the present invention is specifically implemented as follows: A transmitter for implementing bit interleaving, the transmitter 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. An apparatus for selecting an interleaving manner, a device for implementing an interleaving manner, and a transmitter for implementing symbol interleaving and a transmitter for implementing bit interleaving are provided by using channel quality information to select an interleaving manner, which may have The different channel quality directly selects a better interleaving method, thereby reducing transmission errors and improving system throughput. 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.

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

In order to make the objects, the technical solutions and the advantages of the present invention more comprehensible, the present invention will be further described in detail below with reference to the accompanying drawings.

In the embodiment of the present invention, 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.

In the following description of the embodiment, 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, and 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. Here, the subband includes a plurality of subcarriers, and the subband CQI information refers to average information of a plurality of subcarriers CQI.

Of course, 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. In this embodiment, the symbol interleaving mode selector 360 inputs the index number corresponding to the selected symbol interleaving mode to the symbol interleaver 340. As shown in FIG. 3, 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. For the transmitter and receiver, the symbol The number interleaving method and its corresponding symbol interleaving index number are known.

As shown in FIG. 3, 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;

In this embodiment, the pre-set symbol interleaving mode directly corresponds to a symbol data reordering sequence, and the mapping sub-unit 372 establishes channel quality sequence and symbol data rearrangement according to a preset mapping strategy of channel and symbol data. The mapping relationship of the order. In this embodiment, one symbol data is a plurality of symbols mapped onto one sub-band.

In this embodiment, if the pre-set symbol interleaving mode corresponds to a symbol interleaving permutation function, 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. . Since 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. Of course, in this embodiment, in addition to the 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.

In this embodiment, the data block sent by the transmitting end is a constellation-mapped symbol sequence. To reduce the feedback amount of the receiving end, 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. For example, 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.

In this embodiment, for convenience of description, it is assumed that 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.

In this embodiment, 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. In this embodiment, 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. In this embodiment, it is assumed that 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. Then the corresponding channel quality is obtained in the following order: 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. In this embodiment, 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.

In this embodiment, according to the strategy of mapping the received good state symbol data to the subband with poor channel condition, 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, and 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.

According to the above symbol data exchange 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.

Certainly, 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. For A, the symbol sequence after symbol interleaving is B, and the permutation function is represented as X, then the symbol interleaving process can be expressed as AX=B. Therefore, when the mapping relationship between the channel quality order and the symbol data rearrangement order is established, the sequence having the symbol data rearrangement order is multiplied by the inverse of the symbol sequence having the original order, that is, X=BA-1. Corresponding 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.

In this embodiment, 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. In this embodiment, 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.

Of course, in this embodiment, other indication information preset by the receiving end and the transmitting end may be used, and the symbol interleaving manner used by the transmitting end is indicated.

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. When the system in this embodiment is a system supporting error 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. For example, when the non-HARQ system transmits, 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.

When the embodiment of the present invention is applied to the transmission in the error retransmission system such as HARQ, ARQ, etc., in each transmission process, 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.

In the following description of the embodiment, 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.

In this embodiment, the bit quality interleaving mode is selected according to the channel quality information, and 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. Here, the subband includes a plurality of subcarriers, and the subband CQI information refers to average value information of a plurality of subcarriers CQI. Of course, 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. In this embodiment, the bit interleaving mode selector 470 inputs the index number corresponding to the selected bit interleaving mode to the bit interleaver 320. As shown in FIG. 3, 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.

As shown in FIG. 5, 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.

Step 702: Obtain channel quality information fed back by the receiving end.

Step 703: Sort each channel according to channel quality according to channel quality information. In this embodiment, it is assumed that 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. When the symbol sequence after constellation mapping is directly transmitted, 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. In this embodiment, 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.

Of course, in this embodiment, other indication information preset by the receiving end and the transmitting end may be used, and the bit interleaving manner used by the transmitting end is indicated.

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. When the system in this embodiment is a system supporting error 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. For example, when the non-HARQ system transmits, 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.

When the present embodiment is applied to the transmission in the error retransmission system such as HARQ, ARQ, etc., in each transmission process, 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.

When the present embodiment is applied to the transmission in the error retransmission system such as HARQ, ARQ, etc., in each transmission process, 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.

The above described specific embodiments of the present invention are further described in detail, and it is to be understood that the foregoing description is only the preferred embodiments of the present invention The scope of the present invention is intended to be included within the scope of the present invention. Any modifications, equivalents, improvements, etc., are included in the scope of the present invention.

Claims

Rights request

A method for selecting an interleaving method, the method comprising: acquiring, by a transmitting end, channel quality information; and using a channel quality information by the transmitting end to select an interleaving manner.

The method according to claim 1, wherein the interleaving manner is a symbol interleaving manner, and the selecting interleaving manner comprises:

Performing rearrangement of each symbol data mapped to each channel according to channel quality information to obtain a symbol data rearrangement sequence;

According to the correspondence between the preset symbol interleaving method and the symbol data rearrangement order, a symbol interleaving manner is determined by the symbol data rearrangement order as the selected symbol interleaving method.

The method according to claim 1, wherein the interleaving manner is a bit interleaving manner, and the selecting interleaving manner includes:

Performing rearrangement of each symbol data transmitted on each channel of the mapping channel according to channel quality information, to obtain a symbol data rearrangement sequence;

The interleaving modulation is performed according to a preset bit interleaving method, and is mapped to symbol data, and a bit interleaving method is determined by the symbol data rearrangement order as the selected bit interleaving method.

The method according to claim 2, wherein the sequence of each symbol data transmitted on each channel is sequentially rearranged according to channel quality information, and the sequence of symbol data rearrangement is as follows:

Determining, according to the channel quality information, the channel quality according to the channel quality, obtaining a channel quality sequence; mapping the symbol data to the respective channels according to a preset mapping strategy of channel and symbol data , corresponding to the symbol data rearrangement order.

The method according to claim 4, wherein the symbol interleaving manner is a character Number interleaved permutation function;

The determining, by the symbol data rearrangement order, a symbol interleaving manner comprises: multiplying the rearranged symbol sequence by a transposed sequence of the rearranged symbol sequence, corresponding to the obtained one symbol interleaved permutation function.

The method according to claim 4 or 5, wherein the mapping strategy of the preset channel and symbol data comprises: mapping a symbol with good reception status to a channel with a channel with poor channel quality;

The sequence of the corresponding symbol data reordering includes: using the channel quality order as the order of the receiving state of each symbol data; and mapping the symbol data with excellent receiving status to the channel with poor channel quality, and obtaining the need to exchange The sequential symbol data corresponds to the order of the symbol data rearranged after the corresponding symbol data is exchanged.

The method according to claim 1, wherein the method further comprises: transmitting, by the transmitting end, the receiving end to the interleaving mode.

8. The method according to claim 1, 2, 3, 4, 5 or 7, wherein the channel quality information comprises: information characterizing channel quality of each channel.

The method according to claim 8, wherein the acquiring the channel quality information by the transmitting end comprises: receiving information indicating a channel quality of each channel from the receiving end, or extracting a pre-stored characterizing each subcarrier or subband Channel quality information.

The method according to claim 9, wherein the information indicating the channel quality comprises: channel quality indicator CQI information of each subcarrier or each subband or signal to noise ratio SNR of each subcarrier or each subband Measurement information.

11. An apparatus for implementing interleaving mode selection, the apparatus comprising: an information acquisition module and an interleaving mode selection module;

The information acquiring module is configured to acquire channel quality information, and send the channel quality information to Symbol interleaving mode selection module;

The interleaving mode selection module is configured to select an interleaving manner by using the channel quality information.

The apparatus according to claim 11, wherein the interleaving mode selection module is a symbol interleaving mode selection module, and the module includes: a first presetting unit, a symbol data rearranging unit, and a symbol interleaving mode determining unit;

The first preset unit is configured to store a correspondence between a preset symbol interleaving manner and a symbol data rearrangement sequence;

The symbol data rearranging unit is configured to sequentially rearrange each symbol data mapped to each channel according to the channel quality by using the channel quality information from the information acquiring module to obtain a symbol data rearrangement sequence. Transmitting the symbol data rearrangement order to a symbol interleaving manner determining unit, where the symbol interleaving manner determining unit is configured to: according to a correspondence between a symbol interleaving manner preset in the first preset unit and a symbol data rearrangement order And determining, by the symbol data rearrangement order, a symbol interleaving manner as the selected symbol interleaving manner.

The apparatus according to claim 12, wherein the symbol data rearrangement unit comprises: a channel ordering subunit and a mapping subunit;

The channel ordering subunit is configured to sort each channel according to the channel quality according to the channel quality information, and obtain a channel quality sequence;

The mapping subunit is configured to map the symbol data to the respective channels according to a mapping policy of each symbol data in a preset channel and symbol sequence, and correspondingly obtain a symbol data rearrangement sequence.

The apparatus according to claim 13, wherein, when the symbol interleaving manner is a permutation function of one symbol interlace, the symbol interleaving manner determining unit comprises: a function generating subunit; the function generating a subunit, Used to multiply the rearranged symbol sequence by the reordering symbol sequence The sequence is matched to obtain a symbol interleaving permutation function.

The apparatus according to any one of claims 12 to 14, wherein the apparatus further comprises: a first indication module;

The first indication module is configured to indicate, to the receiver, a symbol interleaving manner from the symbol interleaving mode selection module.

The apparatus according to claim 11, wherein the interleaving mode selection module is a bit interleaving mode selection module, and the module includes: a second presetting unit, a symbol data rearranging unit, and a bit interleaving mode determining unit;

The second preset unit is configured to store a preset bit interleaving manner;

The symbol data rearranging unit is configured to sequentially rearrange each symbol data mapped to each channel according to the channel quality by using the channel quality information from the information acquiring module to obtain a symbol data rearrangement sequence. Transmitting the symbol data rearrangement order to the bit interleaving mode determining unit, where the bit interleaving mode determining unit is configured to perform interlace modulation according to a preset bit interleaving manner in the second presetting unit, and map the data into symbol data. The symbol data rearrangement order determines a bit interleaving manner as the selected bit interleaving manner.

The apparatus according to claim 16, wherein the symbol data rearrangement unit comprises: a channel ordering subunit and a mapping subunit;

The device according to claim 16 or 17, wherein the device further comprises: a second indicator module;

The second indication module is configured to indicate, to the receiver, a bit interleaving manner from the bit interleaving mode selection module.

18. A transmitter for implementing symbol interleaving, the transmitter comprising: a symbol interleaving selector and a symbol interleaver;

19. A transmitter for implementing bit interleaving, the transmitter comprising: a bit interleaving selector and a bit interleaver;

The bit interleaving selector is configured to acquire channel quality information, and use the channel quality information to select a bit interleaving manner, and send the selected bit interleaving manner to a bit interleaver;

The bit interleaver is configured to perform bit interleaving according to the bit interleaving manner.