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APSK ( PSK ) modulation LDPC code decoding algorithm

Author: ChenLingSheng
Tutor: XieLei
School: Zhejiang University
Course: Information and Communication Engineering
Keywords: LDPC codes Min-Sum Algorithm BP algorithm APSK modulation
CLC: TN911.22
Type: Master's thesis
Year: 2006
Downloads: 259
Quote: 0
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Abstract


In this paper, on the basis of a detailed study of the existing low-density parity-check ( LDPC ) decoding algorithm , combined with Min-Sum algorithm and the basic principles of maximum likelihood decoding LDPC codes APSK ( PSK ) modulation fast Min-Sum decoding algorithm . Min-Sum algorithm based on the BPSK modulation can be viewed as an approximation of the BP algorithm , the arithmetic ratio BP algorithm must be low , while there is not dependent on the signal-to-noise ratio advantages . However , in multi - APSK ( PSK ) modulation , the calculation of the amount of the Min - Sum algorithm significantly improve that in fact can not be applied . In the analysis of the characteristics of the Min-Sum algorithm is applied to the LDPC code after it has been improved , so that the calculation amount is reduced to almost a considerable amount of calculation of the Min-Sum algorithm based on BPSK modulation . Finally , the similarities and differences in the analysis Compare Quick Min-Sum Algorithm and BP improved rapid Min-Sum algorithm , the simulation performance even more than the BP algorithm .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication theory > Information Theory > Channel coding theory
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