Low density parity check code decoding method and device
A low-density parity and check code technology, applied in coding, code conversion, coding components, etc., to achieve the effect of reducing the amount of calculation and the number of iterations
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Embodiment 1
[0028] Embodiment 1. A decoding method of a low-density parity-check code. In this embodiment, an extended HARQ method is adopted; refer to figure 2 , including the following steps:
[0029] B1. Receive the LDPC code sent by the sending end for the first time, determine the target LDPC code for decoding this time according to the code word, and set the target LDPC code as the initial information node message for decoding;
[0030] The sending end encodes the source output information into an LDPC code with symbols {0, 1} through the generator matrix, which includes information bits and parity bits, and then maps and modulates the above sequence codes into symbols {+1, -1 }’s LDPC code and send it;
[0031] If the LDPC code X={x sent by the sender 1 x 2 ...x N}, after channel transmission, the code R received by the receiving end={r 1 r 2 ...r N}, R=X+v, v is a zero-mean noise vector, and its power spectral density is σ n 2 Can adopt following formula (1) to calculate ...
Embodiment 2
[0058] Embodiment 2, a decoding method of a low-density parity-check code. In this embodiment, a punctured HARQ method is adopted, and the decoding method is basically the same as that of Embodiment 1. The difference is that in this embodiment, it is determined that As the target LDPC code word of retransmission decoding, a method different from formula (6) is adopted:
[0059] If the received retransmission LDPC code R t ={r t，1 r t，2 ...r t，L}, the parity check matrix of the target LDPC code for retransmission decoding H t = ( h ij ) M t × N t , t = 2,3,4 , · · · s , t represents the number of retr...
Embodiment 3
[0063] Embodiment 3, a decoding device of a low-density parity-check code, refer to image 3 , including a receiving unit 210, a decoding unit 220, a storage unit 230 and an object code generating unit 240; wherein:
[0064] The receiving unit 210 is used to receive the LDPC code retransmitted by the sending end;
[0065] The storage unit 230 is used to store the information node information calculated in the last iteration in the previous decoding process;
[0066] The target code generating unit 240 is used to determine the target LDPC code of this decoding according to the LDPC code received by the receiving unit 210 and the information stored in the storage unit 230;
[0067] The decoding unit 220 is used to decode the target LDPC code; specifically, it includes an initialization unit 2211, an information node message updating unit 2212 and an information value updating unit 2213, a check node processing unit 222, a judgment unit 223, and a check unit 224 and control uni...
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