An encoding method, decoding method and decoder of LDPC cascade connection code
A technology of LDPC code and coding method, which is applied in the field of channel coding, LDPC concatenated code construction and decoding, and can solve the problems of high redundancy cost, large loss of coding gain, increased difficulty of concatenated code scheme, complexity of coding and decoding system, etc. question
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[0103] Embodiment 1: Construct LDPC-SPC product code and decode it
[0104] The following specifically describes the process of using the method of the present invention to construct an LDPC-SPC product code with an LDPC code with a length of 8064 bits and a code rate of 1 / 2, and to decode it. The decoding method includes hard decision translation. Code method and soft decision iterative decoding method:
[0105] In this embodiment, n=200, that is, one redundant SPC codeword is inserted every 200 LDPC codes.
[0106] The coding flowchart is shown in Figure 11. The specific steps are as follows:
[0107] 1. Initialization: the information bit stream is framed, and the frame length is 4032 bits;
[0108]2. Pass the 200 information frames through the SPC code encoder in turn. The SPC code encoder adds modulo 2 to the bits of each information frame at the corresponding position, and outputs the result after n=200 information frames, that is, the information in the SPC code Bit, ...
Example Embodiment
[0157] Embodiment 2: Decoder
[0158] This embodiment only provides the implementation scheme of the hard decision decoder of the LDPC-SPC product code constructed in Embodiment 1. The block diagram of the hard decision decoder is shown in Figure 7. It can be divided into four parts: LDPC decoding module, storage module, error code word statistics module and hard decision recovery module.
[0159] Among them, the LDPC code decoding module is used to decode LDPC codewords, which will not be repeated in this embodiment, but is only used to obtain the soft information and hard decision information of the LDPC code information bits. In this embodiment, the hard decision interpretation The coding method only needs the hard decision information of the LDPC code information bits; the storage module requires 201 dual-port RAMs with a size of 4032 bits to store the hard decision information of the LDPC code information bits; the error code word statistics module is composed of a counter, s...
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