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码率自由且低误码平台QC-LDPC码的设计

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摘要 为了提高无线通信系统的纠错能力,本文提出了一种可硬件实现的准循环低密度奇偶校验(Quasi-CyclicLow-Density Parity-Check,QC-LDPC)码的设计方法。这种方法通过改进密度进化算法得到任意码率的好的度分布对,然后采用改进后的PEG(Progressive Edge-Growth)算法得到校验母矩阵,接着在置换序列填充校验母矩阵的过程中施加增大围长(girth)和ACE(Approximate Cycle Extrinsic MessageDegree)约束,使最后得到的QC-LDPC码不仅具有码率自由的优点,并且它的误码平台低。仿真结果表明采用本方法设计的QC-LDPC码与IEEE802.16e中对应码率的QC-LDPC码相比性能更好。
作者 易丹
出处 《武汉交通职业学院学报》 2012年第1期75-78,共4页 Journal of Wuhan Technical College of Communications
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参考文献6

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