Forward error correction encoding,decoding method,apparatus and system

Abstract

The invention discloses a forward error correction encoding, decoding method, an apparatus and a system and belongs to the communication field. The method comprises: determining check matrix parameters of LDPC recurrent code of a time varying period according to transmission system performance, complexity and codon synchronization alignmental, constructing a QC-LDPC check matrix according to determined check matrix parameters and obtaining the check matrix HC of time variant LDPC recurrent code according to the QC-LDPC check matrix; blocking to-be-encoded data according to HC requirement, encoding every blocking data based on HC and obtaining a plurality of codens of LDPC recurrent code; adding the plurality of codens of LDPC recurrent code to data frames and sending the codens of LDPC recurrent code. The invention carries out forward error correction by adopting time variant LDPC recurrent code and LDPC recurrent code has a QC-LDPC structure. Because QC-LDPC checking characters can reduce checking complexity, the performance of LDPC recurrent code is superior to the performance of LDPC block code and the performance of time variant LDPC recurrent code is superior to the performance of time invariant LDPC recurrent code, the invention can be appropriate for a high-speed optical transmission system and satisfy requirements of high gain performance and high throughput.

Description

technical field [0001] The present invention relates to the communication field, in particular to a forward error correction encoding and decoding method, device and system. Background technique [0002] With the development of high-speed optical transmission systems, higher requirements are put forward for FEC (Forward Error Correction, Forward Error Correction) technology. LDPC (Low Density Parity Check, Low Density Parity Check) code, as a type of FEC codeword with a gain characteristic that can approach the Shannon limit, has become a codec method commonly used in FEC technology. [0003] When using LDPC codes to realize FEC, prior art one uses LDPC block codes to combat noise in high-speed coherent optical transmission systems; prior art two uses time-invariant LDPC convolutional codes as the FEC error correction method; prior art three A time-varying periodic LDPC convolutional code is used to perform FEC protection on data in a wireless LAN (Local Area Network, wirel...

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Problems solved by technology

[0005] The LDPC block code adopted in prior art one needs a very long code length to obtain satisfactory performance, and the complexity of realizing a very long LDPC block code will be very high; the time-invariant LDPC convolutional code adopted in prior art two The performance will be slightly worse, and there is a high risk of error leveling after correction. At the same time, its parity check matrix structure is difficult to achieve high parallelism decoding, and the throughput is low, so it is not suitable for optical transmission; The code is used as a block code. This method reduces the transmission efficiency, and is not suitable for use in optical transmission systems. At the same time, its parity check matrix is ​​difficult to achieve high throughput.

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