CN108322293B - Log-likelihood ratio determining method for HARQ, HARQ feedback method and device - Google Patents
Log-likelihood ratio determining method for HARQ, HARQ feedback method and device Download PDFInfo
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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
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
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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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0054—Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
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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
- H04L1/004—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
- H04L1/0061—Error detection codes
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Abstract
A method for determining the log-likelihood ratio of HARQ, a HARQ feedback method and a device thereof, the method comprises receiving retransmission data, calculating to obtain system bit log-likelihood ratio and check bit log-likelihood ratio according to the retransmission data, the retransmission data is determined according to the data with error received for the last times, obtaining a second system bit log-likelihood ratio and a second check bit log-likelihood ratio, the second system bit log-likelihood ratio and the second check bit log-likelihood ratio are obtained after the data with error received for the last times is subjected to channel decoding, combining the system bit log-likelihood ratio and the second system bit log-likelihood ratio, and combining the check bit log-likelihood ratio and the second check bit log-likelihood ratio.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to log-likelihood ratio determining methods for HARQ, HARQ feedback methods, and apparatuses.
Background
The conventional Hybrid Automatic Repeat Request (HARQ) technology combines Forward Error Correction (FEC) and Automatic Repeat Request (ARQ), has the advantages of FEC and ARQ, and can improve data throughput, data transmission reliability and system service quality to a certain extent at .
In the HARQ mechanism, a sending end performs FEC coding on source data and then sends the source data, a receiving end decodes a received data frame through FEC decoding, if the decoding is correct, an Acknowledgement Character (ACK) is fed back to the sending end, if the decoding is incorrect, a Negative Acknowledgement Character (NACK) is fed back to the sending end, the sending end receives information fed back by the receiving end, if the feedback is ACK, next data transmission is performed, if the feedback is NACK, ARQ retransmission is started, and the data frame with the FEC decoding error is retransmitted.
However, with the development of communication technology, the existing HARQ is still not satisfactory in terms of information transmission accuracy.
Disclosure of Invention
The invention solves the technical problem of how to improve the accuracy of information transmission.
In order to solve the above technical problem, an embodiment of the present invention provides kinds of log-likelihood ratio determining methods for HARQ, where the log-likelihood ratio determining method for HARQ includes:
receiving retransmission data, calculating to obtain th system bit log-likelihood ratio and check bit log-likelihood ratio according to the retransmission data, wherein the retransmission data is determined according to the data with errors received for the last times, obtaining a second system bit log-likelihood ratio and a second check bit log-likelihood ratio, wherein the second system bit log-likelihood ratio and the second check bit log-likelihood ratio are obtained after the data with errors received for the last times are subjected to channel decoding, combining the th system bit log-likelihood ratio and the second system bit log-likelihood ratio, and combining the th check bit log-likelihood ratio and the second check bit log-likelihood ratio.
Optionally, the log-likelihood ratio determining method further includes performing channel decoding on a combined result of the th systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio and a combined result of the th parity bit log-likelihood ratio and the second parity bit log-likelihood ratio to obtain a third systematic bit log-likelihood ratio, and combining the second systematic bit log-likelihood ratio and the third systematic bit log-likelihood ratio to obtain a fourth systematic bit log-likelihood ratio.
In order to solve the above technical problem, an embodiment of the present invention further discloses HARQ feedback methods, where the HARQ feedback method includes:
receiving retransmission data, calculating to obtain th system bit log likelihood ratio and check bit log likelihood ratio according to the retransmission data, wherein the retransmission data is determined according to the data with errors received for the last times, obtaining a second system bit log likelihood ratio and a second check bit log likelihood ratio, wherein the second system bit log likelihood ratio and the second check bit log likelihood ratio are obtained after channel decoding the data with errors received for the last times, merging the th system bit log likelihood ratio and the second system bit log likelihood ratio, merging the check bit log likelihood ratio with the second check bit log likelihood ratio, merging the merged result of the th system bit log likelihood ratio and the second system bit log likelihood ratio, carrying out channel decoding on the merged result of the th system bit log likelihood ratio and the second check bit log likelihood ratio to obtain a third system bit log likelihood ratio, generating the third system bit log likelihood ratio by using the third system bit log likelihood ratio, and generating a third check bit log likelihood ratio for feedback by using the third system bit log likelihood ratio and the third check bit log likelihood ratio.
Optionally, the HARQ feedback method further includes: and combining the second systematic bit log-likelihood ratio and the third systematic bit log-likelihood ratio to obtain a fourth systematic bit log-likelihood ratio for determining feedback information.
Optionally, after performing channel decoding on the combined result of the th systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio and the combined result of the th parity bit log-likelihood ratio and the second parity bit log-likelihood ratio, the method further includes storing the third systematic bit log-likelihood ratio.
Optionally, after performing channel decoding on the combined result of the th systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio and the combined result of the th parity bit log-likelihood ratio and the second parity bit log-likelihood ratio, the method further includes storing the third parity bit log-likelihood ratio.
Optionally, the HARQ feedback method further includes: and when the retransmission times of the retransmission data reach the maximum retransmission times, clearing the retransmission data and the stored content.
Optionally, the HARQ feedback method further includes: and combining the symbol with the subsequently received retransmission data to continue channel decoding until the maximum retransmission times is reached.
Optionally, the HARQ feedback method further includes: and if the feedback information is negative response, continuing to receive subsequent retransmission data, and otherwise, receiving new data.
In order to solve the above technical problem, an embodiment of the present invention further discloses kinds of log likelihood ratio determining apparatuses for HARQ, including a calculating module adapted to receive retransmission data, and calculate a systematic bit log likelihood ratio and a parity bit log likelihood ratio according to the retransmission data, where the retransmission data is determined according to data with previous times of reception errors, an obtaining module adapted to obtain a second systematic bit log likelihood ratio and a second parity bit log likelihood ratio, where the second systematic bit log likelihood ratio and the second parity bit log likelihood ratio are obtained after channel decoding the data with previous times of reception errors, and a combining module adapted to combine the systematic bit log likelihood ratio and the second systematic bit log likelihood ratio, and combine the parity bit log likelihood ratio and the second parity bit log likelihood ratio.
Optionally, the apparatus for determining log-likelihood ratio further includes a channel decoding module adapted to perform channel decoding on a combination result of the th systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio and a combination result of the th parity bit log-likelihood ratio and the second parity bit log-likelihood ratio to obtain a third systematic bit log-likelihood ratio, and a second combining module adapted to combine the second systematic bit log-likelihood ratio and the third systematic bit log-likelihood ratio to obtain a fourth systematic bit log-likelihood ratio.
In order to solve the above technical problem, an embodiment of the present invention further discloses HARQ feedback devices, where the HARQ feedback device includes:
the device comprises a calculation module, an acquisition module, a combination module, a channel decoding module, a channel generation module and a third check bit log-likelihood ratio generation module, wherein the calculation module is suitable for receiving retransmission data and calculating to obtain th system bit log-likelihood ratio and check bit log-likelihood ratio according to the retransmission data, the retransmission data is determined according to times of received error data, the acquisition module is suitable for acquiring a second system bit log-likelihood ratio and a second check bit log-likelihood ratio, the second system bit log-likelihood ratio and the second check bit log-likelihood ratio are obtained after channel decoding the times of received error data, the combination module is suitable for combining the th system bit log-likelihood ratio and the second system bit log-likelihood ratio and combining the check bit log-likelihood ratio and the second check bit log-likelihood ratio, the channel decoding module is suitable for combining the th system bit log-likelihood ratio and the second system bit log-likelihood ratio, the check bit log-likelihood ratio and the system bit log-likelihood ratio is used for generating the third system bit log-likelihood ratio by using the channel decoding module and the third check bit log-likelihood ratio to generate the third system bit log-likelihood ratio and the third check bit likelihood ratio by using the third check bit likelihood ratio.
Optionally, the HARQ feedback apparatus further includes: and the second combining module is suitable for combining the second systematic bit log-likelihood ratio and the third systematic bit log-likelihood ratio to obtain a fourth systematic bit log-likelihood ratio for determining feedback information.
Optionally, the HARQ feedback apparatus further includes an th storage module adapted to store the third systematic bit log likelihood ratio.
Optionally, the HARQ feedback apparatus further includes: and the second storage module is suitable for storing the third check bit log-likelihood ratio.
Optionally, the HARQ feedback apparatus further includes: and the clearing module is suitable for clearing the retransmission data and the stored content when the retransmission times of the retransmission data reach the maximum retransmission times.
Optionally, the HARQ feedback apparatus further includes: and the third combining module is suitable for combining the symbol with the subsequently received retransmission data so as to continue channel decoding until the maximum retransmission times is reached.
Optionally, if the feedback information is a negative response, the calculation module continues to receive subsequent retransmission data, and otherwise receives new data.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
the technical scheme includes that retransmission data is received, a th system bit log likelihood ratio and a th check bit log likelihood ratio are obtained through calculation according to the retransmission data, the retransmission data are determined according to times of data with errors received, a second system bit log likelihood ratio and a second check bit log likelihood ratio are obtained, the second system bit log likelihood ratio and the second check bit log likelihood ratio are obtained through channel decoding of times of data with errors received, the th system bit log likelihood ratio and the second system bit log likelihood ratio are combined, the th check bit log likelihood ratio and the second check bit log likelihood ratio are combined, the th system bit log likelihood ratio and the second check bit log likelihood ratio are combined, the second system bit log likelihood ratio and the second check bit log likelihood ratio obtained through channel decoding of the data with errors received for times are combined with the th system bit likelihood ratio and the second check bit log likelihood ratio obtained through channel decoding, the second system bit log likelihood ratio and the second check bit likelihood ratio obtained through calculation according to the retransmission data are combined, the second system bit likelihood ratio and the second check bit likelihood ratio obtained through calculation after channel decoding are combined, the channel decoding is accurate, and the reliability of the transmission decision of the transmission data is improved, and the accuracy of the transmission reliability of the transmission data is improved.
, channel decoding the combined result of bit log-likelihood ratio and second system bit log-likelihood ratio and the combined result of check bit log-likelihood ratio and second check bit log-likelihood ratio to get the third system bit log-likelihood ratio, combining the second system bit log-likelihood ratio and the third system bit log-likelihood ratio to get the fourth system bit log-likelihood ratio, combining the third system bit log-likelihood ratio after channel decoding the two combined results with the second system bit log-likelihood ratio obtained after channel decoding the data with error received for times, and increasing the prior information to improve the accuracy of decoding and judging the retransmitted data, thus steps to improve the accuracy of information transmission.
Drawings
Fig. 1 is a flowchart of log-likelihood ratio determination methods for HARQ according to an embodiment of the present invention;
fig. 2 is a flowchart of HARQ feedback methods according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an application scenario in which the HARQ feedback method according to the embodiment of the present invention is adopted;
fig. 4 is a schematic structural diagram of kinds of log-likelihood ratio determination apparatuses for HARQ according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of HARQ feedback devices according to an embodiment of the present invention.
Detailed Description
As described in the background art, with the development of communication technology, the existing HARQ is still not satisfactory in terms of information transmission accuracy.
The inventor of the present application finds that, for a non-orthogonal multiple access system, the combining mode of the HARQ technology has a large influence on the performance of the system.
The embodiment of the invention combines the second system bit log-likelihood ratio and the second check bit log-likelihood ratio obtained by channel decoding the data with errors received for the last times with the system bit log-likelihood ratio and the check bit log-likelihood ratio obtained by calculation according to retransmission data, and has high accuracy and reliability compared with the log-likelihood ratio before channel decoding due to the second system bit log-likelihood ratio and the second check bit log-likelihood ratio after channel decoding, so that the log-likelihood ratio determined by the embodiment of the invention has high reliability, and the log-likelihood ratio obtained after channel decoding according to the retransmission data can be improved, thereby improving the accuracy of subsequent symbol generation and the accuracy of system judgment, and further improving the information transmission accuracy.
On the basis of the traditional HARQ technology, the embodiment of the invention changes the combination mechanism, improves the reliability of the log-likelihood ratio and further improves the reliability of system information transmission.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a flowchart of log-likelihood ratio determination methods for HARQ according to an embodiment of the present invention.
The log likelihood ratio determining method for HARQ shown in fig. 1 may include the steps of:
step S101, receiving retransmission data, and calculating an th systematic bit log-likelihood ratio and a th check bit log-likelihood ratio according to the retransmission data, wherein the retransmission data is determined according to the data which is received by errors for the last times;
step S102, obtaining a second system bit log-likelihood ratio and a second check bit log-likelihood ratio, wherein the second system bit log-likelihood ratio and the second check bit log-likelihood ratio are obtained after channel decoding is carried out on the data which are received with errors for the last times;
and S103, combining the th systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio, and combining the th check bit log-likelihood ratio and the second check bit log-likelihood ratio.
In this embodiment, the log-likelihood ratio determining method for HARQ may be used for a receiving end.
In a specific implementation, the receiving end may require the transmitting end to retransmit data when decoding fails, where the retransmitted data is determined according to data with errors received last times, for example, for data A1B1C1, if data B1 has errors during reception, the retransmitted data may be B1, or new data may be added, and the retransmitted data may be A2B1C 2.
In a specific implementation, in step S101, retransmission data may be received, and an th systematic bit log-likelihood ratio and a th parity bit log-likelihood ratio may be calculated according to the retransmission data, specifically, multi-user detection may be performed on the retransmission data and an th systematic bit log-likelihood ratio and a th parity bit log-likelihood ratio may be calculated, more specifically, multi-user detection may be performed by using a Belief Propagation (BP) based algorithm and an initial systematic bit log-likelihood ratio and an initial parity bit log-likelihood ratio may be calculated, or multi-user detection may be performed by using a Minimum Mean Square Error (MMSE) algorithm and an initial systematic bit log-likelihood ratio and an initial parity bit log-likelihood ratio may be calculated, respectively.
In a specific implementation, in step S102, a second systematic bit log-likelihood ratio and a second parity bit log-likelihood ratio may be obtained, where the second systematic bit log-likelihood ratio and the second parity bit log-likelihood ratio may be pre-stored, specifically, the data with the upper times of reception errors is channel decoded to obtain the second systematic bit log-likelihood ratio and the second parity bit log-likelihood ratio, and after obtaining the second systematic bit log-likelihood ratio and the second parity bit log-likelihood ratio, the second systematic bit log-likelihood ratio and the second parity bit log-likelihood ratio may be stored for use in a subsequent step.
In a specific implementation, in step S103, the th systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio are combined, and the th parity bit log-likelihood ratio and the second parity bit log-likelihood ratio are combined, specifically, the two combined results are respectively corresponding log inevitable ratios, and may be used in subsequent steps of channel decoding and the like, so as to improve the feedback performance of HARQ.
The embodiment of the invention combines the second system bit log-likelihood ratio and the second check bit log-likelihood ratio obtained by channel decoding the data with errors received for the last times with the system bit log-likelihood ratio and the check bit log-likelihood ratio obtained by calculation according to retransmission data, and has high accuracy and reliability compared with the log-likelihood ratio before channel decoding due to the second system bit log-likelihood ratio and the second check bit log-likelihood ratio after channel decoding, so that the log-likelihood ratio determined by the embodiment of the invention has high reliability, and the log-likelihood ratio obtained after channel decoding according to the retransmission data can be improved, thereby improving the accuracy of subsequent symbol generation and the accuracy of system judgment, and further improving the information transmission accuracy.
Preferably, the method for determining log likelihood ratio for HARQ shown in fig. 1 may further include the steps of performing channel decoding on the combined result of the th systematic bit log likelihood ratio and the second systematic bit log likelihood ratio, and the combined result of the th parity bit log likelihood ratio and the second parity bit log likelihood ratio to obtain a third systematic bit log likelihood ratio, and combining the second systematic bit log likelihood ratio and the third systematic bit log likelihood ratio to obtain a fourth systematic bit log likelihood ratio, and in particular, the fourth systematic bit log likelihood ratio may be used as a system decision limit for deciding feedback ACK or NACK.
According to the embodiment of the invention, the third system bit log-likelihood ratio obtained after channel decoding of the two combined results is combined with the second system bit log-likelihood ratio obtained after channel decoding of the data with the error reception for times, and the accuracy of decoding the retransmission data can be improved by adding the prior information, so that the information transmission accuracy is further improved by steps.
Fig. 2 is a flowchart of HARQ feedback methods according to an embodiment of the present invention.
The HARQ feedback method shown in fig. 2 may include the steps of:
step S201, receiving retransmission data, and calculating to obtain th systematic bit log-likelihood ratio and th check bit log-likelihood ratio according to the retransmission data, wherein the retransmission data is determined according to the data which is received by mistake for the last times;
step S202, obtaining a second system bit log-likelihood ratio and a second check bit log-likelihood ratio, wherein the second system bit log-likelihood ratio and the second check bit log-likelihood ratio are obtained after channel decoding is carried out on the data which are received with errors for the last times;
step S203, merging the th systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio, and merging the th parity bit log-likelihood ratio and the second parity bit log-likelihood ratio;
step S204, carrying out channel decoding on the combined result of the th systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio and the combined result of the th check bit log-likelihood ratio and the second check bit log-likelihood ratio to obtain a third systematic bit log-likelihood ratio;
step S205: generating a third check bit log-likelihood ratio using the third systematic bit log-likelihood ratio;
step S206: generating symbols for feedback according to the third systematic bit log-likelihood ratio and the third check bit log-likelihood ratio.
In this embodiment, the HARQ feedback method may be used for a receiving end.
In this embodiment, the detailed implementation of steps S201 to S203 can refer to steps S101 to S103 shown in fig. 1, and details thereof are not repeated here.
In a specific implementation, in step S204, the target of the channel decoding operation is the combined result of the th systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio, and the combined result of the th check bit log-likelihood ratio and the second check bit log-likelihood ratio, compared with the prior art that the th systematic bit log-likelihood ratio and the th check bit log-likelihood ratio are channel decoded, the information of the second systematic bit log-likelihood ratio and the second check bit log-likelihood ratio is increased, and meanwhile, since the second systematic bit log-likelihood ratio and the second check bit log-likelihood ratio are obtained after times of data with errors are channel decoded, the reliability and accuracy are high, and the reliability and accuracy of the third systematic bit log-likelihood ratio obtained by decoding are high.
Specifically, the receiving end generates and stores symbol level information when the decoding of the current retransmission data fails, and simultaneously requires the transmitting end to transmit subsequent retransmission data, and the receiving end combines and decodes the received subsequent retransmission data and the symbol level information generated by the current retransmission data, so that -specified diversity gain can be generated in the process, the retransmission times are reduced, and further, the time delay is reduced.
The embodiment utilizes the merging result to generate the symbol for the feedback of the HARQ, which can improve the accuracy of the feedback information and further improve the accuracy of information transmission.
Preferably, the following steps may be further included after step S206: and combining the symbol with the subsequently received retransmission data to continue channel decoding until the maximum retransmission times is reached. It should be understood by those skilled in the art that the maximum retransmission number may be preconfigured or may be predetermined by a protocol, and this is not limited in the embodiment of the present invention.
Preferably, the following steps may be further included after step S204: and storing the third systematic bit log-likelihood ratio.
Preferably, the following steps may be further included after step S204: and storing the third check bit log-likelihood ratio.
In this embodiment, by storing the third systematic bit log-likelihood ratio and the third check bit log-likelihood ratio, when subsequent retransmission data is received, the third systematic bit log-likelihood ratio and the third check bit log-likelihood ratio generated by current retransmission data can be retrieved to be combined.
Preferably, after step S204, the method further includes the following steps of combining the second systematic bit log likelihood ratio and the third systematic bit log likelihood ratio to obtain a fourth systematic bit log likelihood ratio for determining feedback information, and specifically, the output after channel decoding may be used as a system decision limit to determine feedback information, where the sending end may determine whether to send retransmission data according to the feedback information, for example, if the fourth systematic bit log likelihood ratio is greater than 0, ACK is fed back, and if the fourth systematic bit log likelihood ratio is less than 0, nack is fed back.
And , if the feedback information is negative acknowledgement, continuing to receive subsequent retransmission data, otherwise, receiving new data, that is, if the feedback information is negative acknowledgement, indicating that the current retransmission data is decoded incorrectly, continuing to receive subsequent retransmission data, otherwise, indicating that the current retransmission data is decoded correctly, and then receiving new data.
The retransmitted data and stored contents are preferably cleared when the number of retransmissions of the retransmitted data reaches a maximum number of retransmissions, i.e., is added for every times of receiving the retransmitted data.
Fig. 3 is a schematic diagram of an application scenario in which the HARQ feedback method according to the embodiment of the present invention is adopted.
As shown in fig. 3, the receiving end receives data y1 (not shown) transmitted at th time, and detector 301 may calculate an initial systematic bit log-likelihood ratio and an initial check bit log-likelihood ratio based on a belief propagation algorithm of multi-user detection, respectively, the initial systematic bit log-likelihood ratio and the initial check bit log-likelihood ratio are input to decoder 304 for channel decoding to obtain a second systematic bit log-likelihood ratio, the second systematic bit passes through check bit log-likelihood ratio generator 305 to generate a second check bit log-likelihood ratio, and the second systematic bit log-likelihood ratio and the second check bit log-likelihood ratio pass through symbol generator 306 to generate symbols.
Wherein the second systematic bit log-likelihood ratios and the second parity bit log-likelihood ratios may be stored, for example, using a buffer.
Assuming that the y1 of the th received data is received with an error, the receiving end receives the retransmitted data y2 of the second transmission and combines with the symbol generated in the th transmission, and then inputs the combined data to the detector 301. the detector 301 can calculate the th systematic bit log-likelihood ratio and the rd check bit log-likelihood ratio respectively by using a belief propagation algorithm based on multi-user detection, at this time, the th systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio are combined by the adder 302, the th check bit log-likelihood ratio and the second check bit log-likelihood ratio are combined by the adder 303. the outputs of the adder 302 and the adder 303 can be input to the decoder 304 for channel decoding and output a third systematic bit log-likelihood ratio.
Further , the second systematic bit log likelihood ratio output by the data transmitted at is added to the third systematic bit log likelihood ratio output by the retransmitted data y2 by the adder 307, and the output result is obtained as the decision limit when the retransmitted data y2 is decoded.
It can be understood that if the data transmitted for the second time is decoded incorrectly, and the data transmitted for the third time is retransmitted data, before the data is input to the decoder 304, the output of the detector 301 is combined with the third systematic bit log-likelihood ratio and the third check bit log-likelihood ratio decoded by the data channel transmitted for the second time by using the adder 302 and the adder 303, and when output, the output is combined with the third systematic bit log-likelihood ratio by using the adder 307; if the data transmitted for the third time is decoded incorrectly, the data transmitted for the fourth time is the retransmission data, and the combining process may refer to the processing process of the retransmission data y 2; and the subsequent retransmission data and the like.
If the data of the second transmission is decoded correctly, the retransmitted data y2 and all the stored log-likelihood ratios are cleared, and new data is received at the same time, which refers to the processing of the data y1 of the th transmission, and is not described herein.
Fig. 4 is a schematic structural diagram of log-likelihood ratio determination apparatuses for HARQ according to an embodiment of the present invention.
The log likelihood ratio determining apparatus 40 for HARQ shown in fig. 4 may include a calculating module 401, an obtaining module 402, and an th combining module 403.
The calculation module 401 is adapted to receive retransmission data, and calculate an th systematic bit log-likelihood ratio and a th check bit log-likelihood ratio according to the retransmission data, where the retransmission data is determined according to the data received with errors for the previous times.
The obtaining module 402 is adapted to obtain a second systematic bit log-likelihood ratio and a second parity bit log-likelihood ratio, where the second systematic bit log-likelihood ratio and the second parity bit log-likelihood ratio are obtained after channel decoding the data with the last times of receiving errors.
The combination module 403 is adapted to combine the systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio and to combine the parity bit log-likelihood ratio and the second parity bit log-likelihood ratio.
Preferably, the log-likelihood ratio determining apparatus 40 for HARQ may further include a channel decoding module (not shown) and a second combining module (not shown), the channel decoding module is adapted to perform channel decoding on the combined result of the th systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio and the combined result of the th parity bit log-likelihood ratio and the second parity bit log-likelihood ratio to obtain a third systematic bit log-likelihood ratio, and the second combining module is adapted to combine the second systematic bit log-likelihood ratio and the third systematic bit log-likelihood ratio to obtain a fourth systematic bit log-likelihood ratio.
It should be noted that, in a specific implementation, the th combining module 403 may be implemented by using the adder 302 and the adder 303 shown in fig. 3, the second combining module may be implemented by using the adder 307, and the th combining module 403 and the second combining module may also be implemented by using any other implementable combining device, which is not limited in this embodiment of the present invention.
For more details of the operation principle and the operation mode of the log-likelihood ratio determining apparatus 40 for HARQ, reference may be made to the relevant descriptions in fig. 1 to fig. 3, and details are not repeated here.
Fig. 5 is a schematic structural diagram of HARQ feedback devices according to an embodiment of the present invention.
The HARQ feedback apparatus 50 shown in fig. 5 may include a calculation module 501, an acquisition module 502, an th combining module 503, a channel decoding module 504, a check bit log-likelihood ratio generation module 505, and a symbol generation module 506.
The calculation module 501 is adapted to receive retransmitted data, and calculate th systematic bit log-likelihood ratio and th check bit log-likelihood ratio according to the retransmitted data, where the retransmitted data is determined according to times of received erroneous data.
The obtaining module 502 is adapted to obtain a second systematic bit log-likelihood ratio and a second parity bit log-likelihood ratio, where the second systematic bit log-likelihood ratio and the second parity bit log-likelihood ratio are obtained after channel decoding the data with the reception error of the last times.
The combination module 503 is adapted to combine the systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio and to combine the parity bit log-likelihood ratio and the second parity bit log-likelihood ratio.
The channel decoding module 504 is adapted to perform channel decoding on the combined result of the th systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio and the combined result of the th parity bit log-likelihood ratio and the second parity bit log-likelihood ratio to obtain a third systematic bit log-likelihood ratio.
The check bit log likelihood ratio generation module 505 generates a third check bit log likelihood ratio using the third systematic bit log likelihood ratio.
The symbol generation module 506 is adapted to generate symbols for feedback from the third systematic bit log-likelihood ratio and the third check bit log-likelihood ratio.
The specific implementation of the calculating module 501, the obtaining module 502 and the -th merging module 503 in this embodiment may refer to the related description of the calculating module 401, the obtaining module 402 and the -th merging module 403 shown in fig. 4, and is not described herein again.
Preferably, the HARQ feedback apparatus 50 shown in fig. 5 may include a second combining module (not shown), which is adapted to combine the second systematic bit log-likelihood ratio and the third systematic bit log-likelihood ratio to obtain a fourth systematic bit log-likelihood ratio for determining the feedback information, further , if the feedback information is a negative acknowledgement, the calculating module 501 continues to receive subsequent retransmitted data, otherwise, new data is received.
Preferably, the HARQ feedback apparatus 50 shown in fig. 5 may include an th storage module (not shown), and the th storage module is adapted to store the third systematic bit log likelihood ratio.
Preferably, the HARQ feedback apparatus 50 shown in fig. 5 may include a second storage module (not shown), and the second storage module is adapted to store the third check bit log-likelihood ratio.
Preferably, the HARQ feedback apparatus 50 shown in fig. 5 may include a clearing module (not shown). The clearing module is suitable for clearing the retransmission data and the stored content when the retransmission times of the retransmission data reach the maximum retransmission times.
Preferably, the HARQ feedback apparatus 50 shown in fig. 5 may include a third combining module (not shown). The third combining module is suitable for combining the symbol with the subsequently received retransmission data so as to continue channel decoding until the maximum retransmission times is reached
For more details of the operation principle and the operation mode of the HARQ feedback apparatus 50, reference may be made to the relevant descriptions in fig. 1 to fig. 4, which are not described herein again.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (18)
1, A log-likelihood ratio determination method for HARQ, comprising:
receiving retransmission data, and calculating an th systematic bit log-likelihood ratio and a th check bit log-likelihood ratio according to the retransmission data, wherein the retransmission data is determined according to the data which is received in error for the last times;
obtaining a second system bit log-likelihood ratio and a second check bit log-likelihood ratio, wherein the second system bit log-likelihood ratio and the second check bit log-likelihood ratio are obtained after channel decoding is performed on the data with the previous times of receiving errors;
combining the th systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio by an adder, and combining the th parity bit log-likelihood ratio and the second parity bit log-likelihood ratio by an adder.
2. The log-likelihood ratio determination method according to claim 1, characterized by further comprising:
performing channel decoding on a combined result of the th systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio and a combined result of the th parity bit log-likelihood ratio and the second parity bit log-likelihood ratio to obtain a third systematic bit log-likelihood ratio;
and combining the second systematic bit log-likelihood ratio and the third systematic bit log-likelihood ratio to obtain a fourth systematic bit log-likelihood ratio.
3, HARQ feedback method, comprising:
receiving retransmission data, and calculating an th systematic bit log-likelihood ratio and a th check bit log-likelihood ratio according to the retransmission data, wherein the retransmission data is determined according to the data which is received in error for the last times;
obtaining a second system bit log-likelihood ratio and a second check bit log-likelihood ratio, wherein the second system bit log-likelihood ratio and the second check bit log-likelihood ratio are obtained after channel decoding is performed on the data with the previous times of receiving errors;
combining, by an adder, the th systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio, and combining, by an adder, the th parity bit log-likelihood ratio and the second parity bit log-likelihood ratio;
performing channel decoding on a combined result of the th systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio and a combined result of the th parity bit log-likelihood ratio and the second parity bit log-likelihood ratio to obtain a third systematic bit log-likelihood ratio;
generating a third check bit log-likelihood ratio using the third systematic bit log-likelihood ratio;
generating symbols for feedback according to the third systematic bit log-likelihood ratio and the third check bit log-likelihood ratio.
4. The HARQ feedback method of claim 3, further comprising:
and combining the second systematic bit log-likelihood ratio and the third systematic bit log-likelihood ratio to obtain a fourth systematic bit log-likelihood ratio for determining feedback information.
5. The HARQ feedback method of claim 4, wherein after performing channel decoding on the combined result of the th systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio, and the combined result of the th parity bit log-likelihood ratio and the second parity bit log-likelihood ratio, the method further comprises:
and storing the third systematic bit log-likelihood ratio.
6. The HARQ feedback method of claim 4, wherein after performing channel decoding on the combined result of the th systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio, and the combined result of the th parity bit log-likelihood ratio and the second parity bit log-likelihood ratio, the method further comprises:
and storing the third check bit log-likelihood ratio.
7. The HARQ feedback method according to claim 5 or 6, further comprising:
and when the retransmission times of the retransmission data reach the maximum retransmission times, clearing the retransmission data and the stored content.
8. The HARQ feedback method of claim 6, further comprising:
and combining the symbol with the subsequently received retransmission data to continue channel decoding until the maximum retransmission times is reached.
9. The HARQ feedback method of claim 4, further comprising:
and if the feedback information is negative response, continuing to receive subsequent retransmission data, and otherwise, receiving new data.
10, A log-likelihood ratio determining apparatus for HARQ, comprising:
the calculation module is suitable for receiving retransmission data, and calculating an th systematic bit log-likelihood ratio and a th check bit log-likelihood ratio according to the retransmission data, wherein the retransmission data are determined according to the data which are received in error for the previous times;
an obtaining module, adapted to obtain a second systematic bit log-likelihood ratio and a second parity bit log-likelihood ratio, where the second systematic bit log-likelihood ratio and the second parity bit log-likelihood ratio are obtained after channel decoding is performed on the data with the reception error of the previous times;
an merging module adapted to merge the systematic bit log likelihood ratio and the second systematic bit log likelihood ratio by an adder and to merge the parity bit log likelihood ratio and the second parity bit log likelihood ratio by an adder.
11. The log-likelihood ratio determination apparatus according to claim 10, further comprising:
a channel decoding module, adapted to perform channel decoding on the combined result of the th systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio, and the combined result of the th parity bit log-likelihood ratio and the second parity bit log-likelihood ratio, so as to obtain a third systematic bit log-likelihood ratio;
and the second combining module is suitable for combining the second systematic bit log-likelihood ratio and the third systematic bit log-likelihood ratio to obtain a fourth systematic bit log-likelihood ratio.
12, HARQ feedback device, comprising:
the calculation module is suitable for receiving retransmission data, and calculating an th systematic bit log-likelihood ratio and a th check bit log-likelihood ratio according to the retransmission data, wherein the retransmission data are determined according to the data which are received in error for the previous times;
an obtaining module, adapted to obtain a second systematic bit log-likelihood ratio and a second parity bit log-likelihood ratio, where the second systematic bit log-likelihood ratio and the second parity bit log-likelihood ratio are obtained after channel decoding is performed on the data with the reception error of the previous times;
an merging module adapted to merge the systematic bit log likelihood ratio and the second systematic bit log likelihood ratio by an adder and to merge the parity bit log likelihood ratio and the second parity bit log likelihood ratio by an adder;
a channel decoding module, adapted to perform channel decoding on the combined result of the th systematic bit log-likelihood ratio and the second systematic bit log-likelihood ratio, and the combined result of the th parity bit log-likelihood ratio and the second parity bit log-likelihood ratio, so as to obtain a third systematic bit log-likelihood ratio;
a check bit log-likelihood ratio generating module for generating a third check bit log-likelihood ratio by using the third systematic bit log-likelihood ratio;
a symbol generating module adapted to generate a symbol for feedback according to the third systematic bit log-likelihood ratio and the third check bit log-likelihood ratio.
13. The HARQ feedback apparatus of claim 12, further comprising:
and the second combining module is suitable for combining the second systematic bit log-likelihood ratio and the third systematic bit log-likelihood ratio to obtain a fourth systematic bit log-likelihood ratio for determining feedback information.
14. The HARQ feedback apparatus of claim 13, further comprising:
storage module adapted to store the third systematic bit log likelihood ratio.
15. The HARQ feedback apparatus of claim 13, further comprising:
and the second storage module is suitable for storing the third check bit log-likelihood ratio.
16. The HARQ feedback device according to claim 14 or 15, further comprising:
and the clearing module is suitable for clearing the retransmission data and the stored content when the retransmission times of the retransmission data reach the maximum retransmission times.
17. The HARQ feedback apparatus of claim 15, further comprising:
and the third combining module is suitable for combining the symbol with the subsequently received retransmission data so as to continue channel decoding until the maximum retransmission times is reached.
18. The HARQ feedback apparatus of claim 13, wherein if the feedback information is a negative acknowledgement, the calculation module continues to receive subsequent retransmitted data, and otherwise receives new data.
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