| 高阶调制的LDPC码译码算法研究 |
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| 引用本文： | 陈燕,蔡灿辉.高阶调制的LDPC码译码算法研究[J].郑州大学学报(工学版),2011(4). |
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| 作者姓名： | 陈燕 蔡灿辉 |
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| 作者单位： | 华侨大学信息科学与工程学院; |
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| 基金项目： | 华侨大学科研基金资助项目(08HZR15) |
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| 摘 要： | 针对LDPC(Low-Density Parity-Check)码的编码调制系统,提出了在信道解码器的输入端,无信道噪声方差估算情况下的接收信息比特对数似然比值(LLR)计算方案,将其应用在LPDC码的置信度传播译码算法和最小和译码算法中.该方案与精确的接收信息LLR计算方案在高斯信道和移动单频网信道下比较,通过Matlab性能仿真显示该方案与后者仅有不到0.5 dB的差距,具有很好的实用价值.
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| 关 键 词： | 低密度奇偶校验码 高阶调制 多径信道 对数似然比 |
Decoding Algorithm for LDPC Codes of High Order Modulation |
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| CHEN Yan,CAI Can-hui.Decoding Algorithm for LDPC Codes of High Order Modulation[J].Journal of Zhengzhou University: Eng Sci,2011(4). |
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| Authors: | CHEN Yan CAI Can-hui |
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| Affiliation: | CHEN Yan,CAI Can-hui(College of Engineering and Science,Hua Qiao University,Quanzhou 362021,China) |
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| Abstract: | Based on low-density parity-check(LDPC) coded modulation system,a new soft decision metric,with and without noise variance knowledge,is derived.We applied the log-likelihood ratio(LLR) of the individual bits to BP and Min-Sum decoding algorithm of LDPC code and proposed how to evaluate the noise variance after equalizer.The simulation results show that compared with accurate scheme,the performances of this scheme has good performance both in AWGN and SFN channel,and have practical value. |
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| Keywords: | low-density parity-check codes high order modulation multi-path channel LLR |
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