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Decoding method for LDPC channel code

A channel coding and decoding technology, applied in the field of digital communication, can solve problems such as affecting decoding performance, NMS algorithm correction effect error, etc., to improve correction accuracy, low error leveling, and solve decoding complexity and decoding. performance effect

Inactive Publication Date: 2009-01-14
SUZHOU UNIV
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Problems solved by technology

However, when the second minimum value is close to the minimum value, the correction effect of the NMS algorithm will have a large error, which will affect the decoding performance

Method used

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  • Decoding method for LDPC channel code
  • Decoding method for LDPC channel code
  • Decoding method for LDPC channel code

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Experimental program
Comparison scheme
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Embodiment

[0034] The code word encoded by LDPC channel is input into the decoder through the digital demodulator, and the check node update step is performed after the initialization process. In this embodiment, the check node update process can be as follows:

[0035] Update checkpoint c m , m∈[1,M]:

[0036] (1) For all the information received by the check node, compare and select the minimum value Min 1 , and the second smallest value Min 2 , and record the subscript n of their corresponding bit nodes, n∈N(m), denoted as n 1 , n 2 ;

[0037] (2) Update check node c m Send to bit node v n , the information of n∈N(m),

[0038] if n≠n 1 ,but E i mn = ω ^ · Min 1 , in, According to the second smallest value in Table 1 (Min 2 ) belongs to the value range selection.

[0039] Table 1

[0040] Secon...

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Abstract

The present invention discloses a decoding method for LDPC channel coding, belongs to field of digital communication technology. In the method, comparing all information receiving from checking node to choose minimum value (Min1) and sub-minimum value (Min2); obtaining checking node update result according to minimum and decoding method, correcting update result by multiplicative dynamic factor omega whose value is determined by span of sub-minimum value received by checking node and varied according to sub-minimum value in each coding iteration to promote correction accuracy and to improve decoding performance, obtaining relative low error floor under high signal-noise ratio. Emulation results indicates that little calculated amount is needed to increase for standard LDPC code of short code length. The inventive decoding performance is better than NMS and OMS algorithm so as to solve contradiction of LDPC code decoding complexity and performance.

Description

technical field [0001] The invention relates to a channel coding technology, in particular to a decoding method of LDPC channel coding, and belongs to the technical field of digital communication. Background technique [0002] Low Density Parity Check Code (Low Density Parity Check Code, LDPC) code is a kind of linear block code (R.G.Gallager, "Low density parity checkcodes", IRE Trans.Inform.Theory, vol.8, no .1, Jan.1962, pp.21-28), which not only has good performance close to the Shannon limit, but also has low decoding complexity and flexible structure. It is a research hotspot in the field of channel coding in recent years. At present, LDPC codes have been widely used in deep space communication, optical fiber communication, satellite digital video and audio broadcasting and other fields, and become a strong competitor of the fourth generation mobile communication system (4G) coding scheme. [0003] Before the present invention was made, in "LDPC Code Principles and Ap...

Claims

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Application Information

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IPC IPC(8): H03M13/11H04L1/00
Inventor 汪一鸣陈蓉
Owner SUZHOU UNIV
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