|Table of Contents|

Code Optimization and Iterative Decoding of QC-LDPC Coded OFDM System

《南京理工大学学报》(自然科学版)[ISSN:1005-9830/CN:32-1397/N]

Issue:
2009年03期
Page:
352-356
Research Field:
Publishing date:

Info

Title:
Code Optimization and Iterative Decoding of QC-LDPC Coded OFDM System
Author(s):
LIU Bin-bin1BAI Dong2GE Qi-hong1MEI Shun-liang1
1.Department of Electronic Engineering,Tsinghua University,Beijing 100084,China;2.Department of Electronics,Peking University,Beijing 100871,China
Keywords:
orthogonal frequency division multiplexing channel coding telecommunication channels low density parity check codes code optimization iterative decoding degree distribution Gaussian approximation
PACS:
TN919.3
DOI:
-
Abstract:
In the multi-paths environment,since the performance of orthogonal frequency division multiplexing(OFDM) system may be severely degraded by the sub-carriers in deep fading,powerful error-correcting codes have to be applied to OFDM.This paper presents a novel quasi-cyclic low density parity check(QC-LDPC) coded OFDM system.In this system,the redundant bits of codeword are mapped to higher-order constellation,and a group shuffled message passing scheduling is used in the iterative decoding.According to the mapping scheme,the QC-LDPC code is optimized by density evolution based on group shuffled message passing with Gaussian approximation.Simulation results show that the proposed system can achieve better error rate performance and faster decoding convergence than conventional approaches on both additive white Gaussian noise(AWGN) and Rayleigh fading channels.

References:

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Memo

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Last Update: 2012-11-19