CN114793145B

CN114793145B - Decoding method, receiving device and storage medium

Info

Publication number: CN114793145B
Application number: CN202110105094.9A
Authority: CN
Inventors: 刘玲; 喻凡
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-01-26
Filing date: 2021-01-26
Publication date: 2024-04-23
Anticipated expiration: 2041-01-26
Also published as: CN114793145A

Abstract

The embodiment of the invention discloses a decoding method, receiving equipment and a storage medium, which are used for reducing the time delay of decoding a signal frame and effectively improving the accuracy of decoding the signal frame. The method comprises the following steps: the method comprises the steps that a receiving device carries out at least one initial inter-code crosstalk (ISI) update on a signal frame to obtain a plurality of initial ISI parameters, wherein the initial ISI parameters correspond to soft information of a first symbol, and the first symbol is any symbol corresponding to the signal frame; the receiving equipment performs M times of ISI updating according to the initial ISI parameters, wherein M is a positive integer greater than 1; and the receiving equipment performs Forward Error Correction (FEC) updating for N times according to the plurality of initial ISI parameters, wherein N is a positive integer greater than 1.

Description

Decoding method, receiving device and storage medium

Technical Field

The present application relates to the field of communications, and in particular, to a decoding method, a receiving device, and a storage medium.

Background

In a communication system, due to device or channel bandwidth limitations, signals may be subject to intersymbol interference (intersymbol interference, ISI) impairments, degrading the performance of the communication system.

To suppress ISI impairment, the receiving device needs to sequentially iterate a plurality of signal frames in turn, as shown in fig. 1, and an example of the processing of any two adjacent nth iterations and n+1th iterations performed on the signal frames by the receiving device is illustrated. In the nth iteration, the forward error correction code (forward error correction, FEC) update module 101 performs FEC update to output extrinsic information, and the sequence detector 102 performs sequence detection on the signal frame and extrinsic information from the FEC update module 101 to output soft information. In the process of the n+1st iteration, the FEC update module 103 performs FEC update to output external information according to the soft information output by the FEC update module 101 from the first iteration and the soft information output by the sequence detector 102, and the sequence detector 104 performs sequence detection to output soft information according to the signal frame and the external information output by the FEC update module 103.

The sequence detector generally performs sequence detection by a (bahl-cook-jelinke-raviv, BCJR) algorithm, so that the algorithm has high complexity and reduces the efficiency of sequence detection. In addition, in each iteration process, the sequence detector needs to wait for external information output by the FEC updating module, for example, in the nth iteration process, if the previous iteration BCJR is not completed, the FEC101 needs to wait for the BCJR to be completed, so that buffering required by the previous stage FEC to be transferred to the module 101 is increased, and efficiency of iterative processing of the signal frame by the receiving device is reduced.

Disclosure of Invention

The embodiment of the invention provides a decoding method, receiving equipment and a storage medium, which are used for reducing the time delay of decoding a signal frame and effectively improving the accuracy of decoding the signal frame.

An embodiment of the present invention provides a decoding method, where the method includes: the method comprises the steps that a receiving device carries out at least one initial inter-code crosstalk (ISI) update on a signal frame to obtain a plurality of initial ISI parameters, wherein the initial ISI parameters correspond to soft information of a first symbol, and the first symbol is any symbol corresponding to the signal frame; the receiving equipment performs M times of ISI updating according to the initial ISI parameters, wherein M is a positive integer greater than 1; the receiving equipment performs N times of Forward Error Correction (FEC) updating according to the initial ISI parameters, wherein N is a positive integer greater than 1; if the end time of the kth FEC update is earlier than the start time of the jth+1 ISI update and the end time of the kth+1 FEC update is later than the start time of the jth+1 ISI update, the receiving device performs the jth+1 ISI update according to a target ISI parameter corresponding to the jth ISI update and a target FEC parameter corresponding to the kth FEC update, where the target ISI parameter and the target FEC parameter correspond to soft information of the first symbol, and the j+1 is a positive integer greater than 1 and less than or equal to M, and the k+1 is a positive integer greater than 1 and less than or equal to N; and the receiving equipment acquires an original signal corresponding to the signal frame according to the target ISI soft information corresponding to the Mth ISI update and the target FEC parameter corresponding to the Nth FEC update.

It can be seen that the processes of performing M ISI updates and performing N FEC updates by the receiving device are independent, i.e. M ISI updates and performing N FEC updates are parallel, and during the same time period, both the FEC updates and the ISI updates can be performed simultaneously. The process of any ISI update in this embodiment does not depend on the specific FEC update output target FEC parameter, so that the delay of ISI update is reduced, and the efficiency of the decoding method in this embodiment is improved. In addition, because the M ISI updates and the N FEC updates shown in the embodiment are parallel, in the same period of time, compared with the existing scheme, the method shown in the embodiment can perform more ISI updates and FEC updates on the signal frame, so that the accuracy of decoding the signal frame is improved.

Based on the first aspect, in an optional implementation manner, if the ending time of the t-th ISI update is earlier than the starting time of the u+1th FEC update and the ending time of the t+1th ISI update is later than the starting time of the u+1th FEC update, the receiving device performs the u+1th FEC update according to the target FEC parameter corresponding to the u-th FEC update and the target FEC parameter corresponding to the t-th ISI update, where t+1 is a positive integer greater than 1 and less than or equal to M, and u+1 is a positive integer greater than 1 and less than or equal to N.

It can be seen that, in the process of FEC updating in this embodiment, the specific ISI updating output target ISI parameter is not relied on, so that the time delay of FEC updating is reduced, and the efficiency of the decoding method in this embodiment is improved.

Based on the first aspect, in an optional implementation manner, the jth ISI update and the j+1th ISI update are used to perform ISI update on all signals included in the signal frame.

Based on the first aspect, in an optional implementation manner, the jth ISI update is configured to perform ISI update on at least one first signal, where the at least one first signal is a part of a signal included in the signal frame, and the (j+1) th ISI update is configured to perform ISI update on at least one second signal, where the at least one second signal is a part of a signal included in the signal frame, and the at least one first signal and the at least one second signal are at least a part of a signal included in the signal frame.

Based on the first aspect, in an optional implementation manner, the kth FEC update and the kth+1th FEC update are both configured to perform FEC update on FEC update nodes corresponding to all signals included in the signal frame, where the FEC update nodes are configured to perform FEC update on the signals to obtain soft information corresponding to the signals.

Based on the first aspect, in an optional implementation manner, the kth FEC update is configured to perform FEC update on at least one first FEC update node corresponding to at least one third signal, where the at least one third signal is a part of signals included in the signal frame, and the at least one first FEC update node is configured to perform FEC update to obtain soft information corresponding to the at least one third signal; the k+1th FEC update is configured to perform FEC update on at least one second FEC update node corresponding to at least one fourth signal, where the at least one fourth signal is a part of a signal included in the signal frame, the at least one second FEC update node is configured to perform FEC update to obtain soft information corresponding to the at least one fourth signal, and the at least one third signal and the at least one fourth signal are at least part of a signal included in the signal frame.

It can be seen that each ISI update is performed by the ISI update module and each FEC update is performed by the FEC update module. In the process of carrying out each ISI update on a signal frame, the purpose of adjusting the time delay of each ISI update can be achieved by setting the number of ISI update modules for carrying out ISI update on the signal frame. In the process of carrying out each FEC update on the signal frame, the purpose of adjusting the time delay of each FEC update can be realized by setting the quantity of the FEC update modules. By adjusting the time delay of each ISI update and the time delay of each FEC update, which are shown in the above description, each ISI update and each FEC update are in an aligned state, so that extra buffering caused by the time delay difference is reduced.

Based on the first aspect, in an optional implementation manner, the method further includes: the receiving device performs a de-interleaving process on the signal frame, and the end time of the de-interleaving process is earlier than the start time of the first FEC update.

Therefore, only one time of de-interleaving treatment is needed for the signal frames, repeated interleaving and de-interleaving are not needed, and the efficiency of decoding the signal frames is improved.

Based on the first aspect, in an optional implementation manner, the receiving device performs at least one initial inter-symbol interference ISI update on the signal frame to obtain a plurality of initial ISI parameters includes: the receiving equipment acquires the signal frame; the receiving device converts the signal frame into initial signal parameters, wherein the initial signal parameters correspond to the signal frame, the first symbol and the response of channel ISI corresponding to the signal frame; the receiving device obtains first initial soft information corresponding to a first target ISI updating node and the first symbol according to soft information corresponding to a second symbol and the first target ISI updating node, wherein the first target ISI updating node is used for carrying out ISI updating on the first symbol and the second symbol; the receiving device obtains second initial soft information according to the initial signal parameter, first initial soft information corresponding to the first target ISI update node and the first symbol, and first initial soft information corresponding to the second target ISI update node and the first symbol, wherein the initial ISI parameter comprises the first initial soft information and the second initial soft information.

It can be seen that the signal frames need to be processed only during the initial ISI update, and that no signal frames need to be acquired during the subsequent M ISI updates. Therefore, the receiving device does not need to buffer the signal frames in the process of updating the ISI for M times, so that the buffer space occupied by buffering the signal frames is saved.

Based on the first aspect, in an optional implementation manner, the target ISI parameter includes first ISI soft information and second ISI soft information, the first ISI soft information corresponds to the second symbol and the first target ISI update node, the second ISI soft information corresponds to the initial signal parameter, the first target ISI update node and the second target ISI update node, and the receiving device performs a j+1th ISI update according to the target ISI parameter corresponding to the j-th ISI update and the target FEC parameter corresponding to the k-th FEC update, where the j-th ISI update includes: the receiving equipment acquires a first target parameter according to the second ISI soft information and the target FEC parameter; the receiving equipment acquires soft information corresponding to the second symbol and the first target ISI updating node according to the first target parameter and the first ISI soft information; the receiving equipment acquires third ISI soft information according to the soft information corresponding to the second symbol and the first target ISI updating node; and the receiving equipment acquires fourth ISI soft information according to the initial signal parameters, the first target ISI updating node, the second target ISI updating node and the first symbol.

It can be seen that in the process of performing the j+1th ISI update on the signal frame, it is not necessary to wait for the completion of the k+1th FEC update, thereby reducing the time delay. In addition, in the process of updating the (j+1) th ISI, a signal frame is not required to be acquired, and the utilization rate of the buffer memory is improved.

Based on the first aspect, in an optional implementation manner, the target ISI parameter includes fifth ISI soft information and sixth ISI soft information, the fifth ISI soft information corresponds to the second symbol and the first target ISI update node, the sixth ISI soft information corresponds to the signal frame, the first target ISI update node and the second target ISI update node, and the receiving device performs a j+1th ISI update according to the target ISI parameter corresponding to the j-th ISI update and the target FEC parameter corresponding to the k-th FEC update, where the j-th ISI update includes: the receiving equipment acquires the signal frame; the receiving equipment acquires a second target parameter according to the sixth ISI soft information and the target FEC parameter; the receiving equipment acquires soft information corresponding to the second symbol and the first target ISI updating node according to the second target parameter and the fifth ISI soft information; the receiving equipment obtains seventh ISI soft information according to the soft information corresponding to the second symbol and the first target ISI updating node; the receiving device obtains eighth ISI soft information according to the signal frame, the first target ISI update node, the second target ISI update node, and the first symbol.

It can be seen that in the process of performing the j+1th ISI update on the signal frame, it is not necessary to wait for the completion of the k+1th FEC update, thereby reducing the time delay.

Based on the first aspect, in an optional implementation manner, the receiving device decodes a first signal frame and a second signal frame sequentially, where the first signal frame and the second signal frame correspond to at least one same symbol.

It can be seen that the complexity of overlap is effectively reduced because overlapping (overlap) of ISI update nodes and FEC update nodes is not required. By performing overlap on the symbol corresponding to the signal frame, the complexity of the overlap is reduced, and meanwhile, the accuracy of decoding the signal frame can be effectively ensured.

A second aspect of the embodiments of the present invention provides a receiving apparatus, including: at least one inter-symbol interference ISI module, configured to perform at least one ISI update on a signal frame to obtain a plurality of initial ISI parameters, where the initial ISI parameters correspond to soft information of a first symbol, and the first symbol is any symbol corresponding to the signal frame; m ISI updating modules, which are used for carrying out M ISI updating according to the initial ISI parameters, wherein M is a positive integer greater than 1; n FEC updating modules, which are used for performing N times of Forward Error Correction (FEC) updating according to the initial ISI parameters, wherein N is a positive integer greater than 1; if the end time of the kth FEC update is earlier than the start time of the jth+1 ISI update and the end time of the kth+1 FEC update is later than the start time of the jth+1 ISI update, the receiving device performs the jth+1 ISI update according to a target ISI parameter corresponding to the jth ISI update and a target FEC parameter corresponding to the kth FEC update, where the target ISI parameter and the target FEC parameter correspond to soft information of the first symbol, and the j+1 is a positive integer greater than 1 and less than or equal to M, and the k+1 is a positive integer greater than 1 and less than or equal to N; and the decoding module is used for acquiring an original signal corresponding to the signal frame according to the target ISI soft information corresponding to the Mth ISI update and the target FEC parameter corresponding to the Nth FEC update.

For a specific description of the beneficial effects shown in this aspect, please refer to the first aspect in detail, and details will not be repeated.

Based on the second aspect, in an optional implementation manner, if the ending time of the t-th ISI update is earlier than the starting time of the u+1th FEC update and the ending time of the t+1th ISI update is later than the starting time of the u+1th FEC update, the receiving device performs the u+1th FEC update according to the target FEC parameter corresponding to the u-th FEC update and the target FEC parameter corresponding to the t-th ISI update, where t+1 is a positive integer greater than 1 and less than or equal to M, and u+1 is a positive integer greater than 1 and less than or equal to N.

Based on the second aspect, in an optional implementation manner, the jth ISI update and the (j+1) th ISI update are used to perform ISI update on all signals included in the signal frame.

Based on the second aspect, in an optional implementation manner, the jth ISI update is configured to perform ISI update on at least one first signal, where the at least one first signal is a part of a signal included in the signal frame, and the (j+1) th ISI update is configured to perform ISI update on at least one second signal, where the at least one second signal is a part of a signal included in the signal frame, and the at least one first signal and the at least one second signal are at least a part of a signal included in the signal frame.

Based on the second aspect, in an optional implementation manner, the kth FEC update and the kth+1th FEC update are both used for performing FEC update on FEC update nodes corresponding to all signals included in the signal frame, where the FEC update nodes are used for performing FEC update on the signals to obtain soft information corresponding to the signals.

Based on the second aspect, in an optional implementation manner, the kth FEC update is configured to perform FEC update on at least one first FEC update node corresponding to at least one third signal, where the at least one third signal is a part of signals included in the signal frame, and the at least one first FEC update node is configured to perform FEC update to obtain soft information corresponding to the at least one third signal; the k+1th FEC update is configured to perform FEC update on at least one second FEC update node corresponding to at least one fourth signal, where the at least one fourth signal is a part of a signal included in the signal frame, the at least one second FEC update node is configured to perform FEC update to obtain soft information corresponding to the at least one fourth signal, and the at least one third signal and the at least one fourth signal are at least part of a signal included in the signal frame.

Based on the second aspect, in an optional implementation manner, the receiving device further includes a de-interleaving module, where the de-interleaving module is configured to perform a de-interleaving process on the signal frame, and an end time of the de-interleaving process is earlier than a start time of the first FEC update.

Based on the second aspect, in an optional implementation manner, the at least one inter-symbol interference ISI module is configured to: acquiring the signal frame; converting the signal frame into initial signal parameters, wherein the initial signal parameters correspond to the response of the signal frame, the first symbol and the channel ISI corresponding to the signal frame; acquiring first initial soft information corresponding to a first target ISI updating node and the first symbol according to soft information corresponding to a second symbol and the first target ISI updating node, wherein the first target ISI updating node is used for carrying out ISI updating on the first symbol and the second symbol; and acquiring second initial soft information according to the initial signal parameters, first initial soft information corresponding to the first target ISI updating node and the first symbol, and first initial soft information corresponding to the second target ISI updating node and the first symbol, wherein the initial ISI parameters comprise the first initial soft information and the second initial soft information.

Based on the second aspect, in an optional implementation manner, the target ISI parameter includes first ISI soft information and second ISI soft information, the first ISI soft information corresponds to the second symbol and the first target ISI update node, the second ISI soft information corresponds to the initial signal parameter, the first target ISI update node and the second target ISI update node, and the M ISI update modules include a j+1th ISI update module, where j+1 is a positive integer greater than 1 and less than or equal to M, and the j+1th ISI update module is configured to: acquiring a first target parameter according to the second ISI soft information and the target FEC parameter; acquiring soft information corresponding to the second symbol and the first target ISI updating node according to the first target parameter and the first ISI soft information; acquiring third ISI soft information according to soft information corresponding to the second symbol and the first target ISI updating node; and acquiring fourth ISI soft information according to the initial signal parameters, the first target ISI updating node, the second target ISI updating node and the first symbol.

Based on the second aspect, in an optional implementation manner, the target ISI parameter includes fifth ISI soft information and sixth ISI soft information, the fifth ISI soft information corresponds to the second symbol and the first target ISI update node, the sixth ISI soft information corresponds to the signal frame, the first target ISI update node and the second target ISI update node, and the M ISI update modules include a j+1th ISI update module, where j+1 is a positive integer greater than 1 and less than or equal to M, and the j+1th ISI update module is configured to: acquiring the signal frame; acquiring a second target parameter according to the sixth ISI soft information and the target FEC parameter; acquiring soft information corresponding to the second symbol and the first target ISI updating node according to the second target parameter and the fifth ISI soft information; obtaining seventh ISI soft information according to soft information corresponding to the second symbol and the first target ISI updating node; and acquiring eighth ISI soft information by the signal frame, the first target ISI updating node, the second target ISI updating node and the first symbol.

In a third aspect, an embodiment of the present invention provides a receiving device, including a processor, a memory, and a receiver, where the processor is respectively interconnected with the memory and the receiver through lines; the receiver is configured to receive a signal from a transmitting device and the processor is configured to invoke the program code in the memory to perform the method according to any of the first aspects described above.

In a fourth aspect, embodiments of the present invention provide a computer readable storage medium storing a computer program for performing the method of any one of the first aspects described above when the computer program is executed by hardware.

In a fifth aspect, an embodiment of the present invention provides a communication system, including a transmitting device and a receiving device, where the transmitting device is configured to transmit a signal to the receiving device, and the receiving device is configured to perform the method set forth in any one of the first aspects.

Drawings

FIG. 1 is a diagram illustrating an example decoding process provided in the prior art;

fig. 2a is a structural example diagram of a transmitting device according to an embodiment of the present application;

fig. 2b is a structural example diagram of a receiving device according to an embodiment of the present application;

FIG. 3 is a flowchart illustrating steps of a decoding method according to a first embodiment of the present application;

Fig. 4 is a block diagram illustrating an exemplary structure of a receiving device according to an embodiment of the present application;

Fig. 5 is a block diagram illustrating another embodiment of a receiving apparatus according to the present application;

fig. 6 is a structural example diagram of an ISI update module provided in the present application;

Fig. 7 is a block diagram illustrating another embodiment of a receiving apparatus according to the present application;

fig. 8 is a block diagram illustrating another embodiment of a receiving apparatus according to the present application;

fig. 9 is a block diagram illustrating another embodiment of a receiving apparatus according to the present application;

Fig. 10 is a structural example diagram of another embodiment of an ISI update module provided in the present application;

FIG. 11 is a flowchart illustrating steps of a decoding method according to a second embodiment of the present application;

fig. 12 is a block diagram illustrating another embodiment of a receiving apparatus according to the present application;

fig. 13 is a block diagram illustrating another embodiment of a receiving apparatus according to the present application;

FIG. 14 is a timing diagram of a decoded signal frame according to an embodiment of the present application;

fig. 15 is a diagram illustrating a decoding example of a signal frame for decoding according to the present application;

Fig. 16 is a diagram illustrating a hardware configuration of a receiving device according to an embodiment of the present application.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.

In order to better understand the decoding method provided by the present application, a communication system to which the decoding method shown in the present application is applied will be described below:

the communication system shown in this embodiment is a coherent optical fiber communication system, which includes a transmitting apparatus and a receiving apparatus. The transmitting device is configured to transmit an optical signal to the receiving device, and the receiving device is configured to decode the optical signal to obtain an original signal.

The following describes a transmitting device with reference to fig. 2a, where fig. 2a is a structural example diagram of an embodiment of the transmitting device provided by the present application.

The transmitting device 201 comprises an FEC encoding module 203, an interleaver 204, a data distribution module 221, a constellation mapping module 205, a pre-filtering module 207, a shaping module 211, a digital-to-analog conversion module 215, a modulator 219 and a multiplexer 223.

It should be noted that the description of the structure of the transmitting apparatus 201 in this embodiment is an alternative example, and is not limited as long as the transmitting apparatus 201 can convert original information data into a signal and transmit it to the receiving apparatus.

The functions of the FEC encoding module 203, the interleaver 204, the data distribution module 221, the constellation mapping module 205, the pre-filtering module 207, and the shaping module 211 shown in this embodiment may be implemented by software, and specifically, a processor included in the transmitting apparatus executes a computer program stored in a memory to perform functions corresponding to the above-mentioned devices. Each of the above devices may also be a separate chip for performing the corresponding function.

The functions of the respective devices included in the transmission apparatus 201 are described in outline below:

The FEC encoding module 203 is configured to perform grouping on the original signal, and perform FEC encoding on the bits included in each group to obtain an FEC encoded signal. In other examples, the FEC encoding module 203 may also encode the original signal with a convolutional code to obtain an FEC encoded signal.

For example, if the galois field (galois field, GF) of the FEC encoding module is GF (2 n), the FEC encoding module 203 may group every n bits of the original signal to correspond to a symbol and FEC encode the symbol to obtain the FEC encoded signal.

The interleaver 204 is configured to interleave the FEC encoded signal to obtain an interleaved sequence. Wherein the interleaver 204 is configured to maximally change the information structure of the FEC encoded signal without changing the information content of the FEC encoded signal.

The data distribution module 221 is configured to transmit the interleaved sequence to a constellation mapping module, where the constellation mapping module is configured to perform constellation mapping on the interleaved sequence to map onto a constellation map, specifically, map each symbol included in the interleaved sequence onto a constellation point of the constellation map.

For example, the interleaving sequence is "0101001010101010 … …", and the data distribution module 221 may divide the interleaving sequence into two data streams (i.e., a first data stream and a second data stream) for input to the constellation mapping module 205, where the interleaving sequence may be allocated into two data streams in an interleaved manner in a group of two symbols, the first data stream being "01001010 … …", and the second data stream being "01101010 … …". There are, of course, a number of ways of distributing the data streams, which are not examples here.

The constellation mapping module 205 is configured to map the first path of data stream onto a constellation map, and the constellation mapping module 205 is further configured to map the second path of data stream onto the constellation map.

Specifically, the constellation mapping module may map "00" to constellation point 1+j, "01" to constellation point-1+j, "10" to constellation point-1-j, and "11" to constellation point 1-j.

It can be seen that the constellation mapping module 205 maps the first data stream "01001010 … …" onto constellation points of "-1+j, -1-j, -1-j … …", respectively. The constellation mapping module 205 outputs the real part and the imaginary part on each constellation point as two paths, and can obtain a first path mapping signal "-1, -1, -1 … …" of the real part of the output and a second path mapping signal "1, -1, -1 … …" of the imaginary part of the output.

It will be appreciated that the constellation mapping module 205 may also map the second data stream "01101010 … …" onto constellation points of "-1+j, -1-j, -1-j, -1-j … …", respectively. The constellation mapping module 205 outputs the real part and the imaginary part on each constellation point separately as two paths, and may obtain a third mapping signal "1, -1, -1, - … …" of the real part of the output and a fourth mapping signal "1, -1, -1, -1" of the imaginary part of the output.

It can be seen that the two data streams can obtain four mapping signals through the constellation mapping module. The constellation mapping manner shown in this embodiment is a plurality of manners, and this embodiment is only exemplified by mapping 2 symbols onto the same constellation point, and in other embodiments, constellation mapping may be performed by using 3 symbols or 4 symbols as a group, which is not particularly limited.

The pre-filtering module 207 is configured to pre-filter the four-path mapping signals to obtain four-path filtered signals, respectively. The pre-filtering is finite impulse response filtering, the bandwidth of the filtered signal is smaller than that of the mapping signal, and the filtered signal is a baud rate signal. Therefore, after pre-filtering, the filtered signal is not lost in information compared to the mapped signal before pre-filtering, but the occupied bandwidth is narrowed.

The shaping module 211 is configured to perform waveform shaping on the four filtered signals respectively to obtain four shaped signals correspondingly.

The digital-to-analog conversion module 215 is configured to perform digital-to-analog conversion on the four paths of the shaped signals to obtain four paths of analog signals.

The modulator 219 is configured to modulate two analog signals from the digital-to-analog conversion module 215 to output one modulated signal, and the modulator 219 is further configured to modulate two analog signals from the digital-to-analog conversion module 215 to output the other modulated signal.

The multiplexer 223 is configured to multiplex two modulated signals into an optical signal, and transmit the optical signal to a channel connected between the transmitting apparatus 201 and the receiving apparatus, which is an optical fiber in this embodiment.

Channel impairments occur during transmission of the signals in the optical fiber to the receiving device. Channel impairments may be equalized by the receiving device, optionally as described below in connection with the specific structure of the receiving device 202 shown in fig. 2 b:

The receiving device 202 comprises a local laser 225, a dispersion compensation module 231, a polarization compensation module 233, a phase recovery module 234, a post-filter module 236, an ISI update module 240, and an FEC update module 244.

It should be noted that the description of the structure of the receiving apparatus 202 in this embodiment is an alternative example, and is not limited as long as the receiving apparatus 202 can convert an optical signal from the transmitting apparatus 201 into an original signal.

The functions of the polarization multiplexing coherent front end 226, the analog-to-digital converter 227, the dispersion compensation module 231, the polarization compensation module 233, the phase recovery module 234, the post-filtering module 236, the ISI update module 240, and the FEC update module 244 shown in this embodiment may be implemented by software, and specifically, a processor included in the receiving apparatus executes a computer program stored in a memory to perform functions corresponding to the above-described devices. Each of the above devices may also be a separate chip for performing the corresponding function.

The polarization multiplexing coherent front end 226 is configured to decouple the optical signal from the transmitting device 201 to obtain a decoupled optical signal, the polarization multiplexing coherent front end 226 is further configured to polarization-separate the decoupled optical signal to form a first path of modulated signal and a second path of modulated signal, the polarization multiplexing coherent front end 226 is further configured to mix the optical signal from the local laser 225 with the first path of modulated signal to restore to a first path of analog signal and a second path of analog signal of a low frequency baseband, and the polarization multiplexing coherent front end 226 is further configured to mix the optical signal from the local laser 225 with the second path of modulated signal to restore to a third path of analog signal and a fourth path of analog signal of the low frequency baseband.

The analog-to-digital converter 227 is configured to perform analog-to-digital conversion on the four analog signals to obtain four digital signals, i.e., a first digital signal, a second digital signal, a third digital signal, and a fourth digital signal.

The dispersion compensation module 231 is configured to perform dispersion compensation on the first digital signal and the second digital signal to obtain a first dispersion compensation signal, and the dispersion compensation module 231 is further configured to perform dispersion compensation on the third digital signal and the fourth digital signal to obtain a second dispersion compensation signal.

The polarization compensation module 233 is configured to perform polarization compensation on the first path of dispersion compensation signal and the second path of dispersion compensation signal, so as to obtain a first path of polarization compensation signal and a second path of polarization compensation signal.

The phase recovery module 234 is configured to perform phase recovery on the first path of dispersion compensation signal to output a first path of equalization recovery signal and a second path of equalization recovery signal, and the phase recovery module 234 is also configured to perform phase recovery on the second path of dispersion compensation signal to output a third path of equalization recovery signal and a fourth path of equalization recovery signal.

The post-filtering module 236 is configured to post-filter the four-path balanced recovery signal to obtain four-path filtered signals, that is, a first path of filtered signal, a second path of filtered signal, a third path of filtered signal, and a fourth path of filtered signal.

Alternatively, the post-filtering module 236 may also adopt a two-way filtering method, which is not specifically limited.

The ISI update module 240 and the FEC update module 244 respectively perform iterative processing on the four paths of filtered signals, that is, the ISI update module 240 is configured to output soft information output after ISI update to the FEC update module 244, and the FEC update module 244 outputs the soft information output after FEC update to the ISI update module 240, so that the influence of ISI is eliminated in a multiple iterative manner, and the decoding accuracy is improved.

The method can effectively inhibit ISI damage and effectively improve decoding accuracy, and the decoding method provided by the application is described below with reference to various embodiments:

Example 1

The present embodiment is described with reference to fig. 3, where fig. 3 is a flowchart illustrating steps of a first embodiment of a decoding method according to the present application.

Step 301, a receiving device performs at least one initial ISI update on a signal frame to obtain a plurality of initial ISI parameters.

The signal frame shown in this embodiment includes a multi-path filtered signal filtered by the post-filtering module, for example, the signal frame includes Y1Y2Y3 … … YX, where Y1 represents a first signal included in the signal frame, YX represents an xth signal included in the signal frame, and the specific value of X is not limited in this embodiment.

Fig. 4 is a diagram showing an example of module connection for implementing ISI update and FEC update according to the present application. The functions of the respective modules shown in fig. 4 may be implemented by software, and in particular, a computer program stored in a memory is executed by a processor included in the reception apparatus to perform the functions corresponding to the respective modules shown in fig. 4. The above modules may also be separate chips for performing the corresponding functions.

The initial ISI update module shown in this embodiment is connected to the post-filter module and is capable of receiving a plurality of signal frames from the post-filter module. The initial ISI update module is configured to sequentially perform initial ISI update on a plurality of signal frames to output initial ISI parameters corresponding to each signal frame.

For example, as shown in fig. 4, the receiving apparatus may perform initial ISI update on all signals Y1Y2Y3 … … YX included in a signal frame by only one initial ISI update module to output initial ISI parameters.

The embodiment also shows that multiple initial ISI updates can be performed on a signal frame by an initial ISI update module to output initial ISI parameters.

As another example, the receiving device may perform initial ISI update on the signal frame by using a plurality of initial ISI update modules, for example, as shown in fig. 5, where the receiving device includes three initial ISI update modules, that is, the receiving device includes a first initial ISI update module, a second initial ISI update module, and a third initial ISI update module, for example, and all three initial ISI update modules are connected to the post-filtering module. The signal frame may be divided into three signal subframes, namely a first signal subframe, a second signal subframe and a third signal subframe, which together constitute the signal frame.

The first initial ISI updating module is configured to perform initial ISI updating on the first signal subframe, and transmit the output initial ISI parameters to the second initial ISI updating module respectively. The second initial ISI update module is configured to perform initial ISI update on the second signal subframe, and transmit the output initial ISI parameters to the third initial ISI update module. The third initial ISI update module is configured to perform initial ISI update on the third signal subframe, and transmit the output initial ISI parameters to the first ISI update module and the first FEC update module respectively.

It should be noted that, in this embodiment, the number of initial ISI update modules included in the receiving device is not limited, as long as each ISI update module can perform initial ISI update on a signal frame to output initial ISI parameters.

The present embodiment is exemplified by an example in which the receiving apparatus includes only one initial ISI update module, and a procedure in which the initial ISI update module performs initial ISI update on a signal frame is described as follows:

the structure of the initial ISI update module is described below:

The initial ISI update module shown in this embodiment includes X ISI update nodes, that is, the number of ISI update nodes included in the initial ISI update module shown in this embodiment is the same as the number of signals included in the signal frame, which are all X. It can be seen that the X ISI update nodes are respectively used for performing initial ISI update on the X signals included in the signal frame, i.e. the first ISI update node is used for performing initial ISI update on the first signal included in the signal frame, and so on, and the X-th ISI update node is used for performing initial ISI update on the X-th signal included in the signal frame.

As shown in fig. 6, taking the post-filter of the receiving device as an example, the post-filter may be implemented by 3 taps, it should be clear that, in this embodiment, the post-filter tap is taken as an example and illustrated, and in other examples, the post-filter tap may take other values, which is not limited in this embodiment.

In case of tap 3, each ISI update node comprised by the initial ISI update module is connected with 3 symbols, it can be seen that the number of symbols connected by each ISI update node is equal to the tap.

For example, the first ISI update node B1 is connected to the symbol A1A2A3, the second ISI update node B2 is connected to the symbol A2A3A4, the third ISI update node B3 is connected to the symbol A3A4A5, and the fourth ISI update node B3 is connected to the symbol A4A5 A6. The connection between the ISI update node and the symbol shown in this embodiment is a logical connection, representing the information transfer process. For example, the first ISI update node B1 is configured to perform initial ISI update on the connected symbols, i.e. the first ISI update node B1 is configured to perform initial ISI update on the symbols A1A2A3, respectively, based on the connection shown above, the first ISI update node B1 is configured to transfer soft information corresponding to the symbol A1 to A1, the first ISI update node B1 is further configured to transfer soft information corresponding to the symbol A2 to A2, the first ISI update node B1 is further configured to transfer soft information corresponding to the symbol A3 to A3, and so on, without limitation.

The following describes the procedure for the initial ISI update module to specifically perform initial ISI update:

First, see the following formula:

In the formula Is the signal output by the post-filter, and/>Indicating that the signal is the j-th signal in the signal frame, it can be seen that/>Representing the signal input to the jth ISI update node. For example, when j is 1, it indicates that the signal input to the first ISI update node B1 is R _B1, and when j is 2, it indicates that the signal input to the second ISI update node B2 is R _B2, and so on.

L represents the memory length of the channel, which is equal to the tap, and it can be seen that the value of L is 3 in this embodiment. A _j+3-i represents theFor example, when i=3 and j=1 each take a value of 1, a _j+3-i represents a symbol A1 connected to the first ISI update node B1, i=2 and j=1, a _j+1-i represents a symbol A2 connected to the first ISI update node B1, and so on. n represents noise. h _i represents the response of the channel ISI corresponding to a _j+3-i.

Next, the initial ISI update module obtains initial signal parameters corresponding to the target symbol according to the following formulaThe target symbol is any symbol corresponding to the signal frame, and is A1 when j is 1, A2 when j is 2, and so on.

It should be noted that, the description of the above formula is an optional example and is not limited in this embodiment, as long as the initial ISI update module can convert the signal frame into an initial signal parameter, where the initial signal parameter corresponds to the signal frame, the first symbol, and the response of the channel ISI corresponding to the signal frame, and the specific functional relationship is not limited in this embodiment.

It can be seen that the initial ISI update module shown in this embodiment can calculate, for a first ISI update node B1 and a symbol A1 connected to the first ISI update node B1, initial signal parameters corresponding to the symbol A1The initial signal parameter/>, corresponding to the symbol A2, can be calculated for the connected A2And for the connected A3, the initial signal parameter/>, corresponding to the symbol A3, can be calculated

Again, the initial ISI update module obtains soft information corresponding to a first ISI update node B1 and a first symbol according to the following formula, where the first symbol is one of three symbols connected to the first ISI update node B1, and this example is exemplified by taking the first symbol as A3:

The first ISI update node calculates first initial soft information corresponding to the first ISI update node B1 and the first symbol A3 It can be seen that the first symbol shown in this embodiment is one symbol connected to the first ISI update node B1.

The method comprisesCorresponding to soft information of a second symbol, which is a symbol connected to the first ISI update node B1 and is different from the first symbol. Specifically,/>For the soft information of the second symbol A1, the soft information of the second symbol A1 is specifically the probabilities of various values of the second symbol A1, for example, in the case where the signal shown in the present embodiment is a pulse amplitude modulation (pulse amplitude modulation, PAM) 4 signal, the soft information of the second symbol A1 refers to the probability that the value of the second symbol A1 is "-3", the probability that the value of the second symbol A1 is "-1", the probability that the value of the second symbol A1 is "3", and the probability that the value of the second symbol A1 is "1". Analogize,/>For a detailed description of the soft information with the second symbol A2, please refer to/>The illustration is not described in detail.

Specifically, the initial ISI update module may perform ISI update on the second symbol by the first ISI update node B1 to obtain soft information of the second symbol.

G represents the functional relation of ISI updates, which is not limited in the present embodiment, as long as the first ISI updating node will be connected to the soft information of the second symbol connected to the first ISI updating node/>Is input to the functional relation g and is capable of outputting first initial soft information corresponding to the first ISI update node B1 and the first symbol A3And (3) obtaining the product.

During initial ISI update of the first symbol A3 by the first ISI update node B1, the first ISI update node B1 will/>Is brought into the formula to obtain/>It can be seen that the first ISI update node B1 can calculate the/>, corresponding to the first ISI update node B1 and the first symbol A3By analogy, the first ISI update node B1 can calculate the/>, corresponding to the first ISI update node B1 and the symbol A2

Again, the receiving apparatus acquires the second initial soft information corresponding to the first symbol A3 according to the following formula

Wherein,For two adjacent ISI updates, the amount of change of the first initial soft information corresponding to the first ISI updating node B1 and the first symbol A3, during the initial ISI updating of the signal frame, is/> By analogy, the amount of change/>, of first initial soft information corresponding to the first ISI update node B1 and the second symbol A1Variation of first initial soft information/>, corresponding to first ISI update node B1 and second symbol A2

The initial ISI parameters shown in this embodiment include the first initial soft information and the second initial soft information shown above.

In this embodiment, when the initial ISI update module successfully acquires the initial ISI parameter, the receiving device may buffer the initial ISI parameter, so that in a process of performing ISI update by a first ISI update module included in the subsequent M ISI update modules, the initial ISI parameter may be acquired from the buffer to perform ISI update, and in a process of performing FEC update by a first FEC update module included in the subsequent N FEC update modules, the initial ISI parameter may be acquired from the buffer to perform FEC update.

Alternatively, the initial ISI update module may send the obtained initial ISI parameters directly to the first ISI update module and the first FEC update module, which is not limited in this embodiment.

In the prior art scheme as shown in fig. 1, in each iteration process, an inverse interleaving process needs to be performed before FEC updating, and an interleaving process is performed on a signal frame between FEC updating and sequence detection, which means that in the case of performing multiple iterations on the signal frame, multiple times of inverse interleaving and interleaving processes need to be performed on the signal frame.

In this embodiment, only one time of de-interleaving processing is required for the signal frame, alternatively, the de-interleaving processing may be performed for the signal frame before the initial FEC updating is performed for the signal frame by the receiving device, so that the initial FEC updating module may perform the FEC updating after the de-interleaving processing.

Because only one time of de-interleaving processing is needed for the signal frames as shown in the embodiment, the repetition of interleaving and de-interleaving is not needed, and the efficiency of decoding the signal frames is improved.

Step 302, the receiving device performs M ISI updates.

In this embodiment, in step 302, the receiving device performs ISI update for M times on the initial ISI parameter output by the initial ISI update module, where M is a positive integer greater than 1, and the specific value of M is not limited in this embodiment.

As shown in fig. 4, the receiving device performs ISI update for M times by using M ISI update modules, for example. The first ISI updating module is used for performing a first ISI updating, the second ISI updating module is used for performing a second ISI updating, and the M-th ISI updating module is used for performing an M-th ISI updating.

The present embodiment exemplifies that one ISI update module can perform one ISI update for all signals included in a signal frame. It can be seen that in the case where a signal frame includes X signals, each of the M ISI update modules shown in this embodiment includes X ISI update nodes.

The following is an exemplary description of the procedure for the first ISI update by the first ISI update module:

first, a first ISI update module obtains initial ISI parameters from an initial ISI update module, where the initial ISI parameters include a target ISI update node and a target symbol, where the target symbol is any symbol corresponding to the signal frame, and the target ISI update node is an ISI update node connected to the target symbol.

It can be seen that if the target symbol is A3 and the target ISI update node is B1, the initial ISI parameters include the first initial soft informationSecond initial soft information/>As another example, if the target symbol is A1 and the target ISI update node is B1, the initial ISI parameters include first initial soft information/>Second initial soft information/>And so on, and will not be described in detail.

In this embodiment, in the ISI update process performed by the first ISI update module, the first FEC update module has not been updated as an example, which is described as an example:

And secondly, the first ISI updating module is used for acquiring the ISI parameters corresponding to the first target ISI updating node and the first symbol, so that the first ISI updating module needs to acquire first initial soft information corresponding to the second target ISI updating node and the first symbol from a plurality of initial ISI parameters from the initial ISI updating module, and also needs to acquire second initial soft information corresponding to the first symbol.

For example, if the first target ISI update node is the second ISI update node B2, the first symbol is the symbol A3, the second symbol is the symbols A1 and A3, and the second target ISI update node is the first ISI update node B1 and the third ISI update node B3, the following description will be given of the procedure of performing the first ISI update for the second ISI update node B2 and the first symbol A3:

first, a first ISI update module obtains a first target parameter corresponding to a first symbol A3 The first target parameter/>As shown in the following formula:

since the first FEC update module has not been updated during the ISI update process, the first ISI update module Is zero.

Next, the first ISI update module obtains a second target parameter (i.e.)/>). First ISI update module acquisition/>/>Please see the first ISI update module acquisition/>The process of (2) is not described in detail.

Again, the first ISI update module obtains soft information of the second symbol according to the formula shown below;

It can be seen that if the first target ISI update node is B2, the value of j is 2, and if the second symbol is A1 and A2, the value of i can be 1 or 2, i.e. the soft information of the second symbol A1 is The soft information of the second symbol A2 is/>Wherein/>And/>All from the initial ISI update module, and details are not described in detail.

Again, the first ISI update module obtains first ISI soft information corresponding to the first symbol and the first target ISI update node (B2) according to the formula shown below.

For the description of the function g, please refer to step 301, and no further description is given.

Finally, the first ISI updating module acquires second ISI soft information corresponding to the first symbol according to the following formula;

Wherein, Update module for/>, from initial ISICalculated/>, for initial ISI update moduleAnd calculated/>, by the first ISI update moduleThe absolute value of the difference between, as such, the/>Calculated/>, for initial ISI update moduleAnd calculated/>, by the first ISI update moduleAbsolute value of the difference between the two, the/>Calculated for initial ISI update moduleAnd calculated/>, by the first ISI update moduleAbsolute value of the difference between them.

The process of the first ISI update module for obtaining the first ISI soft information and the second ISI soft information corresponding to the other ISI update nodes and the symbols is described in detail in the above-mentioned process for obtaining the first ISI soft information and the second ISI soft information corresponding to the second ISI update node and the first symbol A3, which is not described in detail.

The first ISI update module may store the target ISI parameters including the first ISI soft information and the second ISI soft information in a buffer for subsequent ISI update and FEC update.

Step 303, the receiving device performs N FEC updates.

In step 303, the receiving device performs FEC updating for N times for the initial ISI parameter output by the initial ISI updating module, where N is a positive integer greater than 1, and the specific value of N is not limited in this embodiment.

As shown in fig. 4, the receiving device performs FEC updating for N times by using N FEC updating modules as an example. The first FEC updating module is used for performing first FEC updating, the second FEC updating module is used for performing second FEC updating, and the n+1th FEC updating module is used for performing nth FEC updating.

The present embodiment exemplifies that one FEC update module can perform one FEC update on all signals included in a signal frame.

The specific process of performing the FEC update for each FEC update module in this embodiment is not limited, for example, if the first FEC update module.

For example, the first FEC updating module obtains initial ISI parameters from an initial ISI updating module, where the initial ISI parameters include a target ISI updating node and a target symbol, where the target symbol is any symbol corresponding to the signal frame, and the target ISI updating node is an ISI updating node connected to the target symbol.

In this embodiment, in the process of performing FEC updating by using the first FEC updating module, the first ISI updating module is not updated as an example, and the first FEC updating module may perform the first ISI updating according to the initial ISI parameters corresponding to the target ISI updating node and the target symbol.

In other examples, if the first ISI update module has completed updating during the FEC update by the first FEC update module, the first FEC update module performs the first FEC update according to the target ISI parameter from the first ISI update module to output the target FEC parameter.

Wherein the target FEC parameter includes a first FEC soft information and a second FEC soft information. Wherein for a first symbol A3, the first FEC soft informationSoft information corresponding to the first symbol A3. For the first symbol A3, the second FEC soft information is/>

The second FEC soft information isIs related to soft information calculated by the first FEC update module through a different FEC update node. For example, if the first FEC update module performs soft information calculation on the first symbol A3 through three FEC update nodes (C1, C2, and C3), the second FEC soft information of the first symbol A3 is/>Can be/>Wherein/>Soft information obtained by FEC updating the first symbol A3 for FEC updating node C1,/>Soft information obtained by FEC updating the first symbol A3 for FEC updating node C2,/>The soft information obtained by FEC updating the first symbol A3 is FEC updated for the FEC updating node C3.

The process of acquiring the first ISI soft information and the second ISI soft information corresponding to the first symbol A3 by the first FEC updating module is described in detail in the foregoing process of acquiring the first FEC soft information and the second FEC soft information corresponding to other symbols, which is not described in detail.

The first FEC updating module may store the target FEC parameters including the first FEC soft information and the second FEC soft information in a buffer, so as to facilitate ISI updating and FEC updating. The first FEC updating module may also send the target FEC parameter directly to the second FEC updating module or to the corresponding ISI updating module, so as to facilitate subsequent ISI updating and FEC updating.

The foregoing describes a procedure in which a first ISI update module performs a first ISI update among M ISI update modules, and describes a procedure in which a first FEC update module performs a first FEC update among N FEC update modules, and describes any one of M ISI updates and any one of N FEC updates as follows:

The following describes the process of the j+1th ISI update module to implement the j+1th ISI update: the j+1th ISI update module shown in this embodiment is any one of M ISI update modules included in the receiving device, i.e., j+1 is any positive integer greater than 1 and less than or equal to M.

Firstly, the j+1th ISI update module obtains the target ISI parameter outputted from the j ISI update module, wherein for the specific explanation of the target ISI parameter outputted from the j ISI update module, please refer to the specific explanation of the target ISI parameter outputted from the first ISI update module, the details are not repeated.

And secondly, the j+1th ISI updating module acquires the target FEC parameter output by the kth FEC updating module, wherein the kth FEC updating module is one of N FEC updating modules included in the receiving equipment, namely k is a positive integer which is more than or equal to N and less than or equal to N.

For a specific description of the target FEC parameter outputted by the kth FEC updating module, please refer to the description of the target FEC parameter outputted by the first FEC updating module, which is not described in detail.

And thirdly, under the condition that the kth FEC update meets the first condition, the receiving device can perform the (j+1) th ISI update according to the target ISI parameter corresponding to the jth ISI update and the target FEC parameter corresponding to the kth FEC update.

Several examples of this first condition are described below:

Example 1:

As shown in fig. 7, the first condition is that the end time of the kth FEC update module to end the FEC update is located between the end time of the jth ISI update module to end the FEC update and the start time of the jth+1th ISI update module to perform the ISI update, and the end time of the kth+1th FEC update module to perform the FEC update is later than the start time of the jth+1th ISI update module to perform the ISI update.

It can be seen that, as shown in fig. 7, at the start time of ISI update by the j+1th ISI update module, the k FEC update module has completed FEC update, but the k+1th FEC update module has not completed FEC update. At this time, the jth+1th ISI update module cannot acquire the FEC parameters output by the kth+1th FEC update module, and the jth+1th ISI update module may perform ISI update according to the target FEC parameters output by the kth FEC update module.

Example 2:

The first condition is that the end time of finishing the FEC update by the kth FEC update module is earlier than the start time of performing ISI update by the jth ISI update module, and the end time of performing the FEC update by the kth+1th FEC update module is later than the start time of performing the ISI update by the jth+1th ISI update module.

Wherein, the ending time of the kth FEC updating module ending the FEC updating is earlier than the starting time of the jth ISI updating module performing the ISI updating, which means that the value of the ending time of the kth FEC updating module ending the FEC updating is smaller than the value of the starting time of the jth ISI updating module performing the ISI updating.

The fact that the end time of the FEC update performed by the k+1th FEC update module is later than the start time of the ISI update performed by the j+1th ISI update module means that the value of the end time of the FEC update performed by the k+1th FEC update module is greater than the value of the start time of the ISI update performed by the j+1th ISI update module.

It can be seen that at the beginning of the ISI update by the j+1th ISI update module, the k FEC update module has completed the FEC update, but the k+1th FEC update module has not completed the FEC update. At this time, the jth+1th ISI update module cannot acquire the FEC parameters output by the kth+1th FEC update module, and the jth+1th ISI update module may perform ISI update according to the target FEC parameters output by the kth FEC update module.

Example 3

The first condition is that the end time of the kth FEC update module to end the FEC update is earlier than the start time of the jth ISI update module to perform the ISI update, and the end time of the kth+1th FEC update module to perform the FEC update is between the start time of the kth+1th FEC update module to perform the FEC update and the end time of the kth+1th FEC update module to perform the FEC update.

It can be seen that, at the beginning of ISI update by the j+1th ISI update module, the k FEC update module has completed FEC update, and during ISI update by the j+1th ISI update module, the k+1th FEC update module completes FEC update. At this time, the jth+1th ISI update module cannot acquire the FEC parameters output by the kth+1th FEC update module, and the jth+1th ISI update module may perform ISI update according to the target FEC parameters output by the kth FEC update module.

It can be seen that, in the ISI update process of the jth+1th ISI update module shown in this embodiment, the jth+1th ISI update module does not need to wait for the kth+1th FEC update module to complete the FEC update, and can directly perform the jth+1th ISI update according to the latest FEC parameter (from the kth FEC update module) stored in the receiving device.

Because each ISI update module shown in this embodiment does not need to wait for the FEC update module to finish FEC update, compared with the existing scheme, in the same time period, the number of ISI updates performed in the same time period shown in this embodiment is greater than the number of ISI updates performed in the time period in the existing scheme, so that the accuracy of performing ISI update on a signal frame is effectively improved, and the accuracy of decoding is improved.

The following describes a specific process of the (j+1) -th ISI update module, according to the target ISI parameter corresponding to the (j) -th ISI update and the target FEC parameter corresponding to the (k) -th FEC update:

for better understanding, the following exemplifies the j+1th ISI update for the first symbol A3 by the j+1th ISI update module:

first, the j+1th ISI update module acquires second ISI soft information corresponding to the second symbol from the j-th ISI update module and second FEC soft information corresponding to the second symbol from the k-th FEC update module.

For example, for the second symbol, A1, the second ISI soft information is as shown aboveSecond FEC Soft information is/>

Secondly, the j+1th ISI updating module obtains a second target parameter corresponding to the second symbol A1The second target parameter/>As shown in the following formula:

thirdly, the j+1th ISI updating module obtains a second target parameter corresponding to the second symbol A2 And obtaining a first target parameter/>, corresponding to the first symbol A3Please see/>The process of obtaining (1) is not described in detail.

Thirdly, the j+1th ISI updating module obtains soft information of the second symbol according to the following formula;

it can be seen that if the first target ISI update node is B2, the value of j is 2, and if the second symbol is A1 and A2, the value of i may be 1 or 2, i.e. the soft information of the second symbol A1 is/> The soft information of the second symbol A2 is/>

Again, the j+1th ISI update module obtains third ISI soft information corresponding to the first symbol and the first target ISI update node according to the equation shown below.

Finally, the j+1th ISI update module obtains fourth ISI soft information according to all ISI update nodes connected with the first symbol, namely, the first target ISI update node (B1) and the second target ISI update nodes (B1 and B3), and specifically, the j+1th ISI update module calculates second ISI soft information corresponding to the first symbol A3 according to the following formula.

Wherein in the formulaUpdating the module for/>, from the j-th ISIThe specific description can be found in the above, and detailed description is omitted. /(I)Calculated/>, for the j+1th ISI update moduleCalculated/>, with the jth ISI update moduleDifference between, as such, the/>Calculated/>, for the j+1th ISI update moduleCalculated/>, with the jth ISI update moduleDifference between, the/>Calculated/>, for the j+1th ISI update moduleAnd/>, calculated by the jth ISI update moduleDifference between them.

The j+1th ISI update module shown in this embodiment may include third ISI soft information corresponding to the first symbol and the first target ISI update nodeAnd fourth ISI soft information/>, corresponding to the first symbol A3Is transmitted to the j+2th ISI update module.

The j+2th ISI update module performs the j+2th ISI update process, please refer to the j+1th ISI update module performing the j+1th ISI update process, which is not described in detail.

If the j+1th ISI update module is the M th ISI update module, i.e., j+1=m, of M ISI update modules included in the receiving device, the M th ISI update module sends the target ISI parameter output by the M th ISI update module to the FEC update module for making a decision.

The decision FEC updating module shown in this embodiment may be an nth FEC updating module in the N FEC updating modules, or may be one or more decision FEC modules for making decisions, which are connected to the nth FEC updating module and included in the receiving device, and in this embodiment, the method is not limited.

The following describes a specific procedure of the receiving device for performing the (u+1) th FEC update according to the second FEC parameter corresponding to the (u) th FEC update and the second FEC parameter corresponding to the (t) th ISI update in conjunction with fig. 8:

For better understanding, the following exemplary description will be given by taking the u+1th FEC update module to perform the u+1th FEC update on the first symbol A3:

Firstly, the (u+1) th FEC updating module obtains the target FEC parameter from the (u) th FEC updating module, and for specific explanation of the target FEC parameter, please refer to the specific explanation of the target FEC parameter outputted by the first FEC updating module, which is not described in detail in this embodiment.

And secondly, when the (u+1) th FEC updating module determines that the (t) th ISI updating module meets the second condition, the (u+1) th FEC updating module can perform the (u+1) th FEC updating according to the target ISI parameter corresponding to the (t) th ISI updating module and the target FEC parameter corresponding to the (u) th FEC updating module.

Several examples of this second condition are described below:

Example 1:

As shown in fig. 9, the second condition is that the ending time of the ending ISI update of the t-th ISI update module is located between the ending time of the ending FEC update of the u-th FEC update module and the starting time of the FEC update of the u+1th FEC update module, and the ending time of the ISI update of the t+1th ISI update module is later than the starting time of the FEC update of the u+1th FEC update module.

As can be seen from fig. 9, at the start time of FEC update by the (u+1) th FEC update module, the (t) th ISI update module has completed ISI update, but the (t+1) th ISI update module has not completed ISI update. At this time, the (u+1) th FEC updating module cannot acquire the ISI parameter outputted by the (t+1) th ISI updating module, and the (u+1) th FEC updating module may perform FEC updating according to the target ISI parameter outputted by the (t) th ISI updating module.

Example 2:

As shown in fig. 9, the second condition is that the end time of the t-th ISI update module to end the ISI update is earlier than the start time of the u-th FEC update module to perform the FEC update, and the end time of the t+1-th ISI update module to perform the ISI update is later than the start time of the u+1-th FEC update module to perform the FEC update.

It can be seen that at the start of FEC update by the (u+1) th FEC update module, the t-th ISI update module has completed ISI update, but the (t+1) th ISI update module has not completed ISI update. At this time, the (u+1) th FEC updating module cannot acquire the ISI parameter outputted by the (t+1) th ISI updating module, and the (u+1) th FEC updating module may perform FEC updating according to the target ISI parameter outputted by the (t) th ISI updating module.

Example 3

The second condition is that the ending time of the t-th ISI update module for ending the ISI update is earlier than the starting time of the u+1-th FEC update module for ending the ISI update, and the ending time of the t+1-th ISI update module for ending the ISI update is between the starting time of the u+1-th FEC update module for performing the FEC update and the ending time of the u+1-th FEC update module for performing the FEC update.

It can be seen that, at the start time of FEC update by the u+1th FEC update module, the t ISI update module has completed ISI update, and during FEC update by the u+1th FEC update module, the t+1th ISI update module completes ISI update. At this time, the (u+1) th FEC updating module cannot acquire the ISI parameter outputted by the (t+1) th ISI updating module, and the (u+1) th FEC updating module can perform ISI updating according to the target ISI parameter outputted by the (t) th ISI updating module.

The process of performing FEC update by the (u+1) th FEC update module shown in the embodiment is referred to the above description of the process of performing FEC update by the first FEC update module, which is not described in detail.

Step 304, the receiving device acquires the original signal of the signal frame.

In this embodiment, the receiving device may perform FEC decision according to the target soft information output by the mth ISI update and the target FEC parameter output by the nth FEC update to obtain an original signal corresponding to the signal frame.

As shown in fig. 4, the receiving apparatus further includes a decision FEC module connected to the nth FEC update module, the decision FEC module being capable of acquiring the target ISI parameter from the mth ISI update module and the target FEC parameter from the nth FEC update module, the decision FEC module being configured to make a decision to output the original signal of the signal frame.

Alternatively, in other examples, the receiving device may make a decision by an nth FEC update module to output the original signal of the signal frame, in particular, the nth FEC update module receives the target ISI parameter from the mth ISI update module and the target FEC parameter from the M-1 th FEC update module to make a decision to output the original signal of the signal frame.

It can be seen that, in the method shown in this embodiment, the processes of performing the ISI update for M times and the FEC update for N times by the receiving device are independent, that is, the ISI update and the FEC update shown in this embodiment need not be performed at sequential intervals, that is, as shown in the existing scheme, the ISI update is performed once, and the FEC update is performed once, that is, the ISI update process and the FEC update process shown in the existing scheme are serial. In contrast, in the method shown in this embodiment, the receiving apparatus can perform ISI update and FEC update, that is, M times of ISI update and N times of FEC update, respectively, in parallel. Further, as can be seen from comparing the existing scheme with the present embodiment, the existing scheme cannot perform the FEC update and the ISI update simultaneously in the same time period, and the method shown in the present embodiment can perform the FEC update and the ISI update simultaneously in the same time period.

The process of any ISI update in this embodiment does not depend on the specific FEC parameter of the FEC update output, and the process of any FEC update does not depend on the specific ISI parameter of the ISI update output, so that the time delay of ISI update is reduced, the time delay of FEC update is reduced, and the efficiency of the decoding method in this embodiment is improved.

In addition, because the M ISI updates and the N FEC updates shown in the embodiment are parallel, in the same period of time, compared with the existing scheme, the method shown in the embodiment can perform more ISI updates and FEC updates on the signal frame, so that the accuracy of decoding the signal frame is improved.

In the method shown in this embodiment, the signal frame needs to be processed only in the initial ISI update process, and the signal frame does not need to be acquired in the subsequent M ISI update processes. Therefore, the receiving device does not need to buffer the signal frames in the process of updating the ISI for M times, so that the buffer space occupied by buffering the signal frames is saved.

Example two

In the first embodiment, in the process of any ISI update, the first ISI soft information corresponding to the first target ISI update node and the first symbol is obtained as shown in the following formula:

Namely: It can be seen that the formula is calculated as first ISI soft information/>, in case the first target ISI update node is B1 and the first symbol is A3

In this embodiment, for better understanding of the specific process of the first ISI soft information calculated in the ISI update process, the following is described with reference to an example of a specific signal:

Example 1

In this example, the signal type included in the signal frame is a Binary Phase Shift Keying (BPSK) signal, and in this example, the possible values of each symbol corresponding to the signal frame are two, i.e., -1 "or" 1".

The check relation corresponding to any ISI update node shown in this embodiment satisfies the check relation 1 shown below:

Check relation 1 is ：F1(A_sA_s+1A_s+2)＝-2(h₀h₁A_sA_s+1+h₁h₂A_s+1A_s+2+h₀h₂A_sA_s+2). where a _sA_s+ ₁A_s+2 is three symbols connected to one ISI update node.

It should be clear that this example continues with a tap of 3 as an example, i.e. 3 symbols are connected per ISI update node. h ₀h₁h₂ represents the response of the channel ISI corresponding to the three symbols a _sA_s+1A_s+2, respectively.

If the node is updated with the first target ISI and the first symbol is A3, the value of s is 1.

Shown above

In the formula, F1 (000) represents the parameter obtained by substituting the above-described verification relation 1 when A1A2A3 each takes 0, and so on, and F1 (111) represents the parameter obtained by substituting the above-described verification relation 1 when A1A2A3 each takes 1.

Example 2:

the above example is exemplified by the number of symbols connected to each ISI update node being equal to the tap, and in the present example, the number of symbols connected to each ISI update node being unequal to the tap.

All ISI update nodes included in any ISI update module in this example include a plurality of first update nodes and a plurality of second update nodes, where each update node is connected with 2 symbols.

As shown in fig. 10, the ISI update module comprises 5 first update nodes, i.e. B1B2 … B5. The ISI update module further comprises four second update nodes, namely D1D2D3D4.

Wherein the first update node corresponds to a check relation 2 as shown below:

The verification relation 2 is: f2 (A1 A2) = -2 (h ₀h₁+h₁h₂) A1A2, where h ₀h₁ represents the response of the channel ISI corresponding to the two symbols A1A2, respectively.

It can be seen that the first update node B1 is connected to the symbol A1A2, the first update node B2 is connected to the symbol A2A3, and so on, and no further description is given.

The second update node corresponds to a check relation 3 as shown below:

The verification relation 3 is: f3 (A2 A3) = -2h ₀h₂ A2A3, where h ₀h₂ represents the response of the channel ISI corresponding to two symbols a _sA_s+2, respectively.

It can be seen that the second update node D1 is connected to the symbol A1A3, the second update node D2 is connected to the symbol A2A4, and so on, which will not be described in detail.

Then in the case where the first target ISI update node is B3 and the first symbol is A4, the corresponding first ISI soft information

In the case that the first target ISI update node is D2 and the first symbol is A4, the corresponding first ISI soft information 、CN_D2→A4＝max([F3(00)+λ_A2→D2,F3(10)])-max([F3(01)+λ_A2→D2,F3(11)])＝max([λ_A2→D2,0])-max([λ_A2→D2,2h₀h₂]).

Example 3:

In this example, the type of signal included in the signal frame is exemplified by a pulse amplitude modulated (pulse amplitude modulation, PM 4) signal. In this example, the value of each symbol corresponding to a signal frame may be any one of-3, -1, and 3.

The present example continues with a tap of 3 as an example, each ISI update node may be connected with three symbols as shown in fig. 6.

The check relation corresponding to any ISI update node shown in this embodiment satisfies the check relation 4 shown below:

The check relation F4 is ：F4(A_sA_s+1A_s+2)＝-2h₀A_sA_s+1+h₁h₂A_s+1A_s+2+h₀h₂A_sA_s+2, where h ₀h₁h₂ represents the response of the channel ISI corresponding to the three symbols a _sA_s+1A_s+2, respectively.

When the first target ISI update node is B3, the first symbol is A4, and the second symbols are A3 and A5, it can be seen that:

In this example, an example of a ₄ is taken as an example, and a process of a ₄ with a value of-1, 1 or 3 is referred to as a process of a ₄ with a value of-3, which is not described in detail.

Example III

In the first embodiment, taking the example that the receiving device does not need to buffer the signal frame in the process of M ISI updates, the embodiment takes the example that the signal frame needs to be buffered in the process of M ISI updates as an example for illustration:

the following describes the execution of the method shown in this embodiment with reference to fig. 11:

step 1101, the receiving device performs at least one initial ISI update on the signal frame to obtain a plurality of initial ISI parameters.

For a specific description of the signal frame shown in the embodiment, please refer to step 301 in fig. 3, and details are not described in detail in the embodiment.

The structure of the module for performing FEC update and for performing ISI update of the receiving device shown in this embodiment is shown in fig. 4, and is not described in detail in this embodiment. The initial ISI update module, the first ISI update module and the mth ISI update module in this embodiment are all connected to the buffer, so that each ISI update module can acquire data from the buffer.

first, the initial ISI update module obtains first initial soft information corresponding to a target symbol according to the following formula, and takes a first target ISI update node as B2, a first symbol as A3, and second symbols as A2 and A4 as examples.

During the initial ISI update, the child is detected/>The function f2 is not limited in this embodiment as long as the initial ISI update module will/>/>The first initial soft information corresponding to the first symbol A3 and the first target ISI update node B2 may be output by inputting the following formula. Han/>The signal corresponding to the node B2 is updated for the first target ISI included in the signal frame.

Next, the initial ISI update module obtains second initial soft information corresponding to the first symbol A3 according to the following formula

Wherein,Updating the first initial soft information of the node (B1) for the first symbol and the second target ISI,/>, respectivelyFor the first initial soft information corresponding to the first symbol and the second target ISI update node (B3), the specific calculation process refers to the above process of obtaining the first initial soft information corresponding to the first symbol A3 and the first target ISI update node (B2), which is not described in detail.

Step 1102, the receiving device performs M ISI updates.

first, a first ISI update module obtains a third target parameter corresponding to a first symbol A3 The third target parameter/>As shown in the following formula:

For the functions f2 andFor the description of step 1101, a detailed description is omitted.

First ISI update module acquisition />Please see acquisition/>The process of (2) is not described in detail.

In step 1103, the receiving device performs N FEC updates.

The following describes the process of the j+1th ISI update module to implement the j+1th ISI update: for a specific description of the j+1st ISI update module in this embodiment, please refer to fig. 3, and details are not described in this embodiment.

First, the j+1th ISI update module obtains the target ISI parameter outputted from the j ISI update module, and for a specific description of the target ISI parameter, please refer to the embodiment shown in fig. 3, details are not repeated.

Next, the j+1th ISI update module obtains the target FEC parameter output by the kth FEC update module, and the specific description of the target FEC parameter is shown in the embodiment shown in fig. 3, which is not described in detail.

And, when determining that the kth FEC update satisfies the first condition, the receiving device may perform the (j+1) th ISI update according to the target ISI parameter corresponding to the jth ISI update and the target FEC parameter corresponding to the kth FEC update, and for a specific description of the first condition, please refer to the embodiment shown in fig. 3, which is not described in detail in this embodiment.

The following describes a specific process of the (j+1) -th ISI update module, according to the target ISI parameter corresponding to the (j) -th ISI update and the target FEC parameter corresponding to the (k) -th FEC update, to perform the (j+1) -th ISI update:

First, the j+1th ISI update module acquires sixth ISI soft information corresponding to the second symbol from the j-th ISI update module. The second symbol and the first symbol A3 are both concatenated with the first target ISI update node B1. It can be seen that for the second symbol A1, the sixth ISI soft information is For the second symbol A2, the sixth ISI soft information is/>

Next, the j+1th ISI update module obtains soft information corresponding to the second symbol, such as soft information corresponding to the second symbol A1The soft information corresponding to the second symbol A2 is/>

And the j+1th ISI update module obtains seventh ISI soft information, where the seventh ISI soft information corresponds to the first symbol and the first target ISI update node, and detailed description of the seventh ISI soft information is shown in fig. 3, and detailed description of the seventh ISI soft information is omitted.

Finally, the j+1th ISI update module obtains eighth ISI soft information according to all ISI update nodes connected with the first symbol, namely, the first target ISI update node (B1) and the second target ISI update nodes (B1 and B3), and specifically, the j+1th ISI update module calculates eighth ISI soft information corresponding to the first symbol A3 according to the following formula.

The j+1th ISI update module shown in this embodiment may include seventh ISI soft information corresponding to the first symbol and the first target ISI update nodeAnd eighth ISI soft information/>, corresponding to the first symbol A3Is transmitted to the j+2th ISI update module.

The description of the specific process of the u+1th FEC updating module in the present embodiment for performing the u+1th FEC updating on the first symbol A3 is shown in fig. 3, and details are not repeated in the present embodiment.

Step 1104, the receiving device acquires the original signal of the signal frame.

For a detailed description of the specific implementation of step 1104 shown in this embodiment, please refer to step 304 shown in fig. 3, which is not described in detail.

Example IV

In the above embodiment, the ISI update is performed on all signals included in the signal frame by using each ISI update module as an example, that is, the above embodiment is described by using X ISI update nodes as an example, so that one ISI update module can perform ISI update on all signals included in the signal frame.

In this embodiment, the number of ISI update nodes included in each ISI update module is smaller than X, so that each ISI update module performs ISI update on only a portion of symbols corresponding to a signal frame.

Referring to fig. 12, each three ISI update modules is configured to perform a complete ISI update on a signal frame, for example, a first ISI update module, a second ISI update module, and a third ISI update module are configured to perform ISI update on all symbols corresponding to the signal frame. It can be seen that the sum of the number of ISI update nodes comprised by the first ISI update module, the number of ISI update nodes comprised by the second ISI update module and the number of ISI update nodes comprised by the third ISI update module is X.

For example, a signal frame includes x=120 signals, the first ISI update module is configured to perform a first ISI update on symbols corresponding to the first 40 signals (i.e., Y1Y2 … Y40), the second ISI update module is configured to perform a first ISI update on symbols corresponding to the middle 40 signals (i.e., Y41Y42 … Y80), and the third ISI update module is configured to perform a first ISI update on symbols corresponding to the second 40 signals (i.e., Y81Y82 … Y120).

It should be noted that the present embodiment is not limited to the description of the packet, for example, the first ISI update module is configured to perform a first ISI update on a symbol corresponding to Y1Y4Y7 …, the second ISI update node is configured to perform a first ISI update on a symbol corresponding to Y2Y5Y8 …, and the third ISI update module is configured to perform a first ISI update on a symbol corresponding to Y3Y6Y9 ….

It should be noted that the number of signals that each ISI update module can perform ISI update is not limited in this embodiment.

The ISI updating process performed by each ISI updating module may be shown in any of the above embodiments, and will not be described in detail in this embodiment.

Referring to fig. 12, each four FEC update modules is configured to perform FEC update on a signal frame once, for example, a first FEC update module, a second FEC update module, a third FEC update module, and a fourth FEC update module are configured to perform FEC update on all symbols corresponding to the signal frame. It can be seen that the sum of the number of FEC update nodes included in the first FEC update module, the number of FEC update nodes included in the second FEC update module, the number of FEC update nodes included in the third FEC update module, and the number of FEC update nodes included in the fourth FEC update module is X.

For example, the signal frame includes x=120 signals, the first FEC updating module is configured to perform a first FEC update on symbols corresponding to 30 signals in the signal frame, the second FEC updating module is configured to perform a first FEC update on symbols corresponding to 30 signals in the signal frame, and so on, the fourth FEC updating module is configured to perform a first FEC update on symbols corresponding to 30 signals in the signal frame, and in this embodiment, among the plurality of FEC updating modules performing the first FEC update on the signal frame, different FEC updating modules are configured to perform FEC updates on symbols corresponding to different signals included in the signal frame.

It should be noted that, in this embodiment, the number of signals that each FEC update module can perform FEC update is not limited.

The method of the embodiment has the beneficial effects that the accuracy of decoding the signal frame can be effectively improved by adopting the method of the embodiment, and the following concrete description is given:

Taking the first ISI update as an example, in the process of performing the first ISI update on the signal frame, performing ISI update through a plurality of ISI update modules, and taking the first FEC update as an example, in the process of performing the first FEC update on the signal frame, performing FEC update through a plurality of FEC update modules, thereby effectively improving the iteration times of performing ISI update and FEC update on the signal frame, and improving the decoding accuracy.

For example, if only one ISI update module performs ISI update on all signals included in a signal frame, the duration of each ISI update module performing ISI update is relatively long, and only one ISI update module shown in this embodiment needs to perform ISI update on a portion of signals included in the signal frame, then the duration of each ISI update module performing ISI update is relatively short, and in the same period of time, the method shown in this embodiment can implement more times of ISI update.

Similarly, if only one FEC update module performs FEC update on all signals included in a signal frame, the duration of performing FEC update by each FEC update module is relatively long, and only a part of signals included in the signal frame need to be FEC updated by one FEC update module in this embodiment, the duration of performing FEC update by each FEC update module is relatively short, and in the same period of time, the method shown in this embodiment can implement FEC update for more times.

For another example, if only one ISI update module performs ISI update on all signals included in the signal frame, and only one FEC update module performs FEC update on all signals included in the signal frame, the first ISI update and the first FEC update are taken as examples continuously, and if the first FEC update is not completed during the first ISI update and/or the first ISI update is not completed during the first FEC update, then the first ISI update cannot perform ISI update according to the target FEC parameter output by the first FEC update, and the first FEC update cannot perform FEC update according to the target ISI parameter output by the first ISI update.

In this embodiment, as the plurality of ISI update modules perform the first ISI update, the different ISI update modules output a plurality of target ISI parameters in the process of the first ISI update, and as the plurality of FEC update modules perform the first FEC update, the different FEC update modules output a plurality of target FEC parameters in the process of the first FEC update, so that the number of iterations between the ISI update modules and the FEC update modules is increased, for example, the target ISI parameter output by the second ISI update module can be used for performing the FEC update by the fourth FEC update module, and for example, the target FEC parameter output by the second FEC update module can be used for performing the ISI update by the third ISI update module, so that in the process of the first ISI update and the first FEC update, the iteration of the target ISI parameter and the target FEC parameter can be realized, and the accuracy and efficiency of decoding are effectively improved.

The beneficial effects shown in this embodiment are also that:

The purpose of adjusting the time delay of each ISI update can be achieved by setting the number of ISI update modules in the process of each ISI update of a signal frame, for example, in the process of performing the first ISI update of the signal frame, if the time delay of the first ISI update needs to be increased, the number of ISI update modules can be increased, and if the time delay of the first ISI update needs to be reduced, the number of ISI update modules can be reduced.

In the process of performing each FEC update on the signal frame, the purpose of adjusting the time delay of each FEC update can be achieved by setting the number of FEC update modules, for example, in the process of performing the first FEC update on the signal frame, if the time delay of the first FEC update needs to be increased, the time delay of the first FEC update can be achieved by increasing the number of FEC update modules, and if the time delay of the first FEC update needs to be reduced, the time delay of the first FEC update can be achieved by decreasing the number of FEC update modules.

The purposes of adjusting the delay of ISI updates and adjusting the delay of FEC updates are described below in conjunction with the description of fig. 13:

By the above-mentioned manner of adjusting the time delay of the first ISI update and the time delay of the first FEC update, each ISI update and each FEC update are in an aligned state, so that extra buffering caused by the time delay difference is reduced. For example, the first ISI update module ISI update is completed, the second FEC update module initiates an FEC update, so that the second FEC update module can obtain the destination ISI parameter from the first ISI update module, and after the first FEC update module has completed the second ISI update module initiates an ISI update, so that the second ISI update module can obtain the destination FEC parameter from the first FEC update module, and so on. Therefore, the target ISI parameters output by each ISI updating module can be transmitted to the FEC updating module without long-time buffering, the target FEC parameters output by each FEC updating module can be transmitted to the ISI updating module without long-time buffering, the buffering time of the target ISI parameters output by each ISI updating module and the target FEC parameters output by each FEC updating module is effectively reduced, the buffered data volume is reduced, and the buffered utilization rate is improved.

Example five

First, referring to fig. 14, a plurality of signal frames according to an existing scheme will be described, and the receiving apparatus according to the present embodiment decodes a first signal frame, a second signal frame, a third signal frame, and a fourth signal frame in sequence.

Based on the configuration of the receiving apparatus shown in fig. 1, in order to improve the accuracy of sequence detection of signal frames, overlapping (overlap) processing is performed on a plurality of signal frames.

Taking the data block 32, overlap=4 as an example, to perform overlap, the last four signals of the first signal frame are required to be identical to the first four signals of the second signal frame, and the last four signals of the second signal frame are required to be identical to the first four signals of the third signal frame. That is, if overlap is not performed, only 32 signals need to be processed per signal frame, but 40 signals need to be processed per signal frame to perform overlap.

It can be seen that, in the existing scheme, for performing ISI update on a signal frame including 40 signals, 40 ISI update nodes need to be set in each ISI update, and in the existing scheme, for performing sequence detection on a signal frame including 40 signals, 40 sequence detection nodes need to be set in each sequence detection.

It can be seen that, compared to the effective signals (32) that each signal frame needs to transmit, more sequence detection nodes need to be set for each ISI update, which increases complexity of overlap, and in the example shown in fig. 14, the data traffic is typically increased by more than 25%, which is costly in maintaining performance.

As shown in fig. 15, the number of ISI update nodes included in each ISI update is equal to the number of effective signals included in each signal frame, and the number of ISI update nodes is not changed. As shown in fig. 15, if the number of effective signals per signal frame is 32, the number of ISI update nodes included in each ISI update shown in this embodiment is also 32. In this embodiment, the ISI update node does not perform overlap, and only the symbol corresponding to the signal frame is overlapped as shown in this embodiment. I.e. the first signal frame and the second signal frame correspond to one or more identical symbols.

As shown in fig. 15, taking a block length of 4 and overlap=2 as an example, it is convenient to describe that the first signal frame corresponds to 6 symbols, the second signal frame also corresponds to 6 symbols, and the last two symbols corresponding to the first signal frame are identical to the first two symbols corresponding to the second signal frame. And (3) updating information, namely, updating the number of check nodes with higher complexity, wherein the number of check nodes with lower complexity is unchanged, and the performance is maintained through App transmission of an overlay.

Because the ISI update node does not need to be overlapped, the complexity of overlap is effectively reduced. The embodiment reduces the complexity of the overlap by performing the overlap on the symbol corresponding to the signal frame, and simultaneously can effectively ensure the accuracy of decoding the signal frame, and reduces the complexity by 25% relative to the scheme shown in fig. 14.

The structure of the receiving apparatus provided by the present application is described below from the viewpoint of functional blocks:

The receiving device shown in this embodiment includes at least one initial inter-symbol interference ISI module, M ISI update modules, N FEC update modules, and a decoding module.

For a specific description of the initial inter-symbol interference ISI module, the M ISI update modules, and the N FEC update modules, please refer to fig. 4, fig. 5, fig. 8, fig. 12, and fig. 13, which are not described in detail.

The decoding module shown in this embodiment is configured to obtain an original signal corresponding to the signal frame according to the target ISI soft information corresponding to the mth ISI update and the target FEC parameter corresponding to the nth FEC update. For example, in the embodiment shown in fig. 8, the decoding module may be a decision FEC module, and for another example, the decoding module may be an nth FEC update module.

The structure of the receiving device is described below in connection with the view of the physical hardware shown in fig. 16, where fig. 16 is a diagram illustrating an example of the structure of the receiving device according to the present application.

The receiving device comprises a processor 1602, a memory 1603 and a receiver 1601. The processor 1602, memory 1603 and receiver 1601 are interconnected by wires. Wherein the memory 1603 is used for storing program instructions and data.

In one possible implementation, the memory 1603 stores program instructions and data supporting the steps shown in fig. 3 and 11, the receiver 1601 is configured to receive a signal from a transmitting device, and the processor 1602 is configured to perform steps 301 through 304 shown in fig. 3. The processor 1602 is also configured to perform steps 1101 to 1104 shown in fig. 11.

The embodiment of the application also provides a chip. Integrated into the chip are circuitry and one or more interfaces for implementing the functions of the processor 1602 described above. When the memory is integrated in the chip, the chip may perform the method steps of any one or more of the preceding embodiments. When the memory is not integrated in the chip, the memory can be connected with an external memory through an interface. The chip implements the actions performed by the receiving device in the above embodiments according to the program code stored in the external memory.

Those of ordinary skill in the art will appreciate that all or a portion of the steps implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing the relevant hardware, where the program may be stored in a computer readable storage medium, where the storage medium may be a read only memory, a random access memory, etc. Specifically, for example: the processing unit or processor may be a central processing unit, a general purpose processor, a Digital Signal Processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (field programmable GATE ARRAY, FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

When implemented in software, the method steps described in the above embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media.

Finally, it should be noted that: the foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A decoding method, the method comprising:

The method comprises the steps that a receiving device carries out at least one initial inter-code crosstalk (ISI) update on a signal frame to obtain a plurality of initial ISI parameters, wherein the initial ISI parameters correspond to soft information of a first symbol, and the first symbol is any symbol corresponding to the signal frame;

The receiving equipment performs M times of ISI updating according to the initial ISI parameters, wherein M is a positive integer greater than 1;

the receiving equipment performs N times of Forward Error Correction (FEC) updating according to the initial ISI parameters, wherein N is a positive integer greater than 1;

If the end time of the kth FEC update is earlier than the start time of the jth+1 ISI update and the end time of the kth+1 FEC update is later than the start time of the jth+1 ISI update, the receiving device performs the jth+1 ISI update according to a target ISI parameter corresponding to the jth ISI update and a target FEC parameter corresponding to the kth FEC update, where the target ISI parameter and the target FEC parameter correspond to soft information of the first symbol, and the j+1 is a positive integer greater than 1 and less than or equal to M, and the k+1 is a positive integer greater than 1 and less than or equal to N;

and the receiving equipment acquires an original signal corresponding to the signal frame according to the target ISI soft information corresponding to the Mth ISI update and the target FEC parameter corresponding to the Nth FEC update.

2. The method according to claim 1, wherein if the ending time of the t-th ISI update is earlier than the starting time of the u+1th FEC update and the ending time of the t+1th ISI update is later than the starting time of the u+1th FEC update, the receiving device performs the u+1th FEC update according to the target FEC parameter corresponding to the u-th FEC update and the target FEC parameter corresponding to the t-th ISI update, where t+1 is a positive integer greater than 1 and less than or equal to M, and u+1 is a positive integer greater than 1 and less than or equal to N.

3. The method of claim 1, wherein the j-th ISI update and the j+1-th ISI update are each used to perform ISI update on all signals included in the signal frame.

4. The method of claim 1, wherein the j-th ISI update is used to perform ISI update on at least one first signal, the at least one first signal being a part of a signal included in the signal frame, wherein the j+1-th ISI update is used to perform ISI update on at least one second signal, the at least one second signal being a part of a signal included in the signal frame, and wherein the at least one first signal and the at least one second signal are at least part of a signal included in the signal frame.

5. The method according to any one of claims 1 to 4, wherein the kth FEC update and the kth+1th FEC update are each configured to perform FEC update on FEC update nodes corresponding to all signals included in the signal frame, where the FEC update nodes are configured to perform FEC update on the signals to obtain soft information corresponding to the signals.

6. The method according to any one of claims 1 to 4, wherein the kth FEC update is configured to perform FEC update on at least one first FEC update node corresponding to at least one third signal, where the at least one third signal is a partial signal included in the signal frame, and the at least one first FEC update node is configured to perform FEC update to obtain soft information corresponding to the at least one third signal;

The k+1th FEC update is configured to perform FEC update on at least one second FEC update node corresponding to at least one fourth signal, where the at least one fourth signal is a part of a signal included in the signal frame, the at least one second FEC update node is configured to perform FEC update to obtain soft information corresponding to the at least one fourth signal, and the at least one third signal and the at least one fourth signal are at least part of a signal included in the signal frame.

7. The method according to any one of claims 1 to 4, further comprising:

The receiving device performs a de-interleaving process on the signal frame, and the end time of the de-interleaving process is earlier than the start time of the first FEC update.

8. The method of any of claims 1-4, wherein the receiving device performing at least one initial inter-symbol interference, ISI, update on the signal frame to obtain a plurality of initial ISI parameters comprises:

the receiving equipment acquires the signal frame;

The receiving device converts the signal frame into initial signal parameters, wherein the initial signal parameters correspond to the signal frame and the response of channel ISI corresponding to the signal frame;

The receiving device obtains first initial soft information corresponding to a first target ISI updating node and a first symbol according to soft information corresponding to a second symbol and the first target ISI updating node, wherein the first target ISI updating node is used for carrying out ISI updating on the first symbol and the second symbol;

the receiving device obtains second initial soft information according to the initial signal parameter, first initial soft information corresponding to the first target ISI update node and the first symbol, and first initial soft information corresponding to the second target ISI update node and the first symbol, wherein the initial ISI parameter comprises the first initial soft information and the second initial soft information.

9. The method of claim 8, wherein the target ISI parameters include first ISI soft information and second ISI soft information, the first ISI soft information corresponding to the second symbol and the first target ISI update node, the second ISI soft information corresponding to the initial signal parameter, the first target ISI update node, and the second target ISI update node, and the receiving device performs a j+1th ISI update according to the target ISI parameter corresponding to the j-th ISI update and the target FEC parameter corresponding to the k-th FEC update, comprising:

the receiving equipment acquires a first target parameter according to the second ISI soft information and the target FEC parameter;

The receiving equipment acquires soft information corresponding to the second symbol and the first target ISI updating node according to the first target parameter and the first ISI soft information;

The receiving equipment acquires third ISI soft information according to the soft information corresponding to the second symbol and the first target ISI updating node;

And the receiving equipment acquires fourth ISI soft information according to the initial signal parameters, the first target ISI updating node, the second target ISI updating node and the first symbol.

10. The method of claim 8, wherein the target ISI parameters include fifth ISI soft information and sixth ISI soft information, the fifth ISI soft information corresponding to the second symbol and the first target ISI update node, the sixth ISI soft information corresponding to the signal frame, the first target ISI update node, and the second target ISI update node, and the receiving device performs a j+1th ISI update according to the target ISI parameters corresponding to the j-th ISI update and the target FEC parameters corresponding to the k-th FEC update, comprising:

The receiving equipment acquires the signal frame;

The receiving equipment acquires a second target parameter according to the sixth ISI soft information and the target FEC parameter;

The receiving equipment acquires soft information corresponding to the second symbol and the first target ISI updating node according to the second target parameter and the fifth ISI soft information;

the receiving equipment obtains seventh ISI soft information according to the soft information corresponding to the second symbol and the first target ISI updating node;

The receiving device obtains eighth ISI soft information according to the signal frame, the first target ISI update node, the second target ISI update node, and the first symbol.

11. The method according to any of claims 1 to 4, wherein the receiving device decodes a first signal frame and a second signal frame in sequence, wherein the first signal frame and the second signal frame correspond to at least one identical symbol.

12. A receiving apparatus, comprising:

At least one inter-symbol interference ISI module, configured to perform at least one ISI update on a signal frame to obtain a plurality of initial ISI parameters, where the initial ISI parameters correspond to soft information of a first symbol, and the first symbol is any symbol corresponding to the signal frame;

M ISI updating modules, which are used for carrying out M ISI updating according to the initial ISI parameters, wherein M is a positive integer greater than 1;

n FEC updating modules, which are used for performing N times of Forward Error Correction (FEC) updating according to the initial ISI parameters, wherein N is a positive integer greater than 1;

and the decoding module is used for acquiring an original signal corresponding to the signal frame according to the target ISI soft information corresponding to the Mth ISI update and the target FEC parameter corresponding to the Nth FEC update.

13. The receiving device of claim 12, wherein if the ending time of the t-th ISI update is earlier than the starting time of the u+1th FEC update and the ending time of the t+1th ISI update is later than the starting time of the u+1th FEC update, the receiving device performs the u+1th FEC update according to the target FEC parameter corresponding to the u-th FEC update and the target FEC parameter corresponding to the t-th ISI update, where t+1 is a positive integer greater than 1 and less than or equal to M, and u+1 is a positive integer greater than 1 and less than or equal to N.

14. The receiving device of claim 12, wherein the j-th ISI update and the j+1-th ISI update are each used to perform ISI update on all signals included in the signal frame.

15. The receiving device of claim 12, wherein the j-th ISI update is used to perform ISI update on at least one first signal, the at least one first signal being a part of a signal included in the signal frame, wherein the j+1-th ISI update is used to perform ISI update on at least one second signal, the at least one second signal being a part of a signal included in the signal frame, and wherein the at least one first signal and the at least one second signal are at least part of a signal included in the signal frame.

16. The apparatus according to any one of claims 12 to 15, wherein the kth FEC update and the kth+1th FEC update are each configured to perform FEC update on FEC update nodes corresponding to all signals included in the signal frame, where the FEC update nodes are configured to perform FEC update on the signals to obtain soft information corresponding to the signals.

17. The receiving device according to any one of claims 12 to 15, wherein the kth FEC update is configured to perform FEC update on at least one first FEC update node corresponding to at least one third signal, where the at least one third signal is a partial signal included in the signal frame, and the at least one first FEC update node is configured to perform FEC update to obtain soft information corresponding to the at least one third signal;

18. The receiving device according to any of claims 12 to 15, further comprising a de-interleaving module for performing a de-interleaving process on the signal frame, the de-interleaving process ending at a time earlier than a start time of a first FEC update.

19. The receiving device according to any of claims 12 to 15, wherein the at least one inter-symbol interference, ISI, module is configured to:

acquiring the signal frame;

Converting the signal frame into initial signal parameters, wherein the initial signal parameters correspond to the response of the signal frame, the first symbol and the channel ISI corresponding to the signal frame;

Acquiring first initial soft information corresponding to a first target ISI updating node and a first symbol according to soft information corresponding to a second symbol and the first target ISI updating node, wherein the first target ISI updating node is used for carrying out ISI updating on the first symbol and the second symbol;

and acquiring second initial soft information according to the initial signal parameters, first initial soft information corresponding to the first target ISI updating node and the first symbol, and first initial soft information corresponding to the second target ISI updating node and the first symbol, wherein the initial ISI parameters comprise the first initial soft information and the second initial soft information.

20. The receiving device of claim 19, wherein the target ISI parameters include first ISI soft information and second ISI soft information, the first ISI soft information corresponding to the second symbol and the first target ISI update node, the second ISI soft information corresponding to the initial signal parameters, the first target ISI update node, and the second target ISI update node, the M ISI update modules including a j+1th ISI update module, the j+1 being a positive integer greater than 1 and less than or equal to the M, the j+1th ISI update module to:

Acquiring a first target parameter according to the second ISI soft information and the target FEC parameter;

Acquiring soft information corresponding to the second symbol and the first target ISI updating node according to the first target parameter and the first ISI soft information;

acquiring third ISI soft information according to soft information corresponding to the second symbol and the first target ISI updating node;

and acquiring fourth ISI soft information according to the initial signal parameters, the first target ISI updating node, the second target ISI updating node and the first symbol.

21. The receiving device of claim 19, wherein the target ISI parameters include fifth ISI soft information and sixth ISI soft information, the fifth ISI soft information corresponding to the second symbol and the first target ISI update node, the sixth ISI soft information corresponding to the signal frame, the first target ISI update node, and the second target ISI update node, the M ISI update modules including a j+1th ISI update module, the j+1 being a positive integer greater than 1 and less than or equal to the M, the j+1th ISI update module being configured to:

acquiring the signal frame;

Acquiring a second target parameter according to the sixth ISI soft information and the target FEC parameter;

Acquiring soft information corresponding to the second symbol and the first target ISI updating node according to the second target parameter and the fifth ISI soft information;

Obtaining seventh ISI soft information according to soft information corresponding to the second symbol and the first target ISI updating node;

And acquiring eighth ISI soft information by the signal frame, the first target ISI updating node, the second target ISI updating node and the first symbol.

22. A receiving device comprising a processor, a memory and a receiver, said processor being interconnected by wires to said memory and said receiver, respectively;

The receiver being arranged to receive a signal from a transmitting device and the processor being arranged to invoke program code in the memory to perform the method of any of claims 1 to 11.

23. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program for performing the method of any one of claims 1 to 11 when the computer program is executed by hardware.