Adaptive Algorithm Based on Log Likelihood Ratio Decoding of LDPC Coded Modulation

doi:10.13190/jbupt.200702.102.wuxg

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2007, Vol. 30 ›› Issue (2): 102-105.doi: 10.13190/jbupt.200702.102.wuxg

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Adaptive Algorithm Based on Log Likelihood Ratio Decoding of LDPC Coded Modulation

WU Xiao-guang, ZHNG Zhi, DENG Gong,ZHANG Ping

(School of Telecommunication Engineering, Beijing University of Posts and Telecommunications, Beijing 100087, China)

Received:2006-05-28 Revised:1900-01-01 Online:2007-04-30 Published:2007-04-30
Contact: WU Xiao-guang

Abstract

Abstract:

For beneficial of log likelihood ratio decoding of low-density parity-check (LDPC) coded modulation, an adaptive power allocation algorithm is proposed in orthogonal frequency division multiplexing (OFDM) systems. The transmit power allocated to sub-carriers is adjusted according to the channel gain of each sub-channel to optimize the decoding performance. Simulation results show that the algorithm can effectively improve the bit-error-rate performance of the system, adapting to the time-variant behavior of the multi-path fading channel.

Key words: low-density parity-check, orthogonal frequency division multiplexing, log likelihood ratio decoding, adaptive algorithm

CLC Number:

TN911.22

WU Xiao-guang, ZHNG Zhi, DENG Gong,ZHANG Ping. Adaptive Algorithm Based on Log Likelihood Ratio Decoding of LDPC Coded Modulation[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2007, 30(2): 102-105.

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Adaptive Algorithm Based on Log Likelihood Ratio Decoding of LDPC Coded Modulation

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