【摘要】 LDPC码是低密度的线性分组码,此种码的低密度特性使其具有逼近香农限的优良性能,从而成为纠错码研究的热点.对LDPC码的速率兼容构造进行系统的分析和研究,在此基础上进一步研究了速率兼容LDPC码的编/译码算法以及构造,并以IEEE802.16e协议规定的LDPC码为基础,用一种基于树形结构的短环检测方法进行短环检测,并且对其中的六环进行处理,得到一种经过短环结构优化的LTE-QC-LDPC码,同时给出了在AWGN信道下使用BP译码算法的误码性能仿真图.研究和仿真结果说明,经过六环优化后的LTE-QC-LDPC码具有很好的速率兼容特性,并且可以线性编码具有良好的误码率性能.更多还原

【Abstract】 Since LDPC codes has been rediscovered by MacKay and Neal because of its excellent performance of close to the Shannon limit,it became the research focus in the Channel coding industry soon.In this paper,based on the systematic analysis and research of the structure of rate-compatible LDPC codes,made a further study of the rate-compatible LDPC code encoding / decoding algorithms and structure,and based on the agreement of IEEE802.16e LDPC codes,used a short loop detection method based on tree structure for short-loop test,and deal with six-ring in it.Proposed a LTE-QC-LDPC codes which through structure optimization of the short ring and gave BER simulation of figure using the BP decoding algorithm under the AWGN channel.The results and simulation diagram showed that after the six-ring optimized LTE-QC-LDPC codes had good rate compatible,and conld be a linear code with good BER performance.更多还原