北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2007, Vol. 30 ›› Issue (2): 102-105.doi: 10.13190/jbupt.200702.102.wuxg

• 研究报告 • 上一篇    下一篇

利于LDPC码对数似然比译码的自适应功率分配算法

吴晓光, 张治,等钢,张 平   

  1. (北京邮电大学 电信工程学院, 北京 100876)
  • 收稿日期:2006-05-28 修回日期:1900-01-01 出版日期:2007-04-30 发布日期:2007-04-30
  • 通讯作者: 吴晓光

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

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

  1. (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

摘要:

提出了一种在低密度奇偶校验码(LDPC)编码的正交频分复用 (OFDM)系统中,利于各子载波进行LDPC码对数似然比译码的自适应功率分配算法,根据信道条件调整各子载波的功率,使系统的译码性能达到最优。给出了该算法在多径衰落信道下的仿真,仿真结果表明,自适应预处理算法对系统的误比特性能有了很大程度的提高。

关键词: 低密度奇偶校验码, 正交频分复用, 对数似然比译码, 自适应

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

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