Performance of Irregular LDPC Codes on Rician-Fading Channels

LIN Jia-ru; WU Wei-ling

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Performance of Irregular LDPC Codes on Rician-Fading Channels

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- Performance of Irregular LDPC Codes on Rician-Fading Channels
- Acta Electronica Sinica Vol. 33, Issue 1, Pages: 43-46(2005)
- 作者机构：
  
  北京邮电大学信息工程学院,北京,100876
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN91
- Published：2005
- 稿件说明：
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LIN Jia-ru, WU Wei-ling. Performance of Irregular LDPC Codes on Rician-Fading Channels[J]. Acta Electronica Sinica, 2005, 33(1): 43-46.
DOI：

LIN Jia-ru, WU Wei-ling. Performance of Irregular LDPC Codes on Rician-Fading Channels[J]. Acta Electronica Sinica, 2005, 33(1): 43-46. DOI：

摘要

本文对非规则LDPC码在RICE信道的性能进行了分析和仿真

修正了BP译码算法

证明了RICE信道满足对称性

给出了RICE信道译码稳定性条件

推导出了RICE信道的Shannon容量限

采用VC编程对码长

=49512和3072进行了仿真

同时与同码长的Turbo码进行了比较;仿真结果表明LDPC码在码长

＝49512、码率

＝1/3时

与Shannon限相差1dB以内、在低信噪比时其性能优于Turbo码

以及LDPC码本身有很好的交织特性和抗衰落的能力;这进一步表明了LDPC码在包括RICE信道在内的各种信道中的性能都是非常优良的.

Abstract

This paper analyzes and simulates the performance of irregular low density parity check (LDPC) codes on Rician fading channels and the others

and modifies BP decoding algorithm

proves the symmetry and shows the stability conditions on Rician channels

calculates the Shannon limit of Rician channels.Using Visual C+ + we simulate the performance with code word length

=3072 and 49152.The simulation results indicate that when

=49152

code rate

=1/3

the distance from Shannon's limit are 0.67dB

0.72dB and 0.91dB for AWGN

Rician and Raylrigh channels

respectively

LDPC codes having nice interleaving performance and anti-fading capability

and better performance of LDPC than Turbo codes in some area of SNR.Therefore the performance of LDPC codes is also very effective on all kind of channels

including Rician channels.

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