TB-SC PLDPC编码的DCO-OFDM系统中新型比特交织方案设计  

Design of a New Bit Interleaving Scheme for the TB-SC PLDPC-coded DCO-OFDM Systems

作　　者：戴林 罗忠亮 李丹 DAI Lin;LUO Zhongliang;LI Dan(School of Information Engineering,Shaoguang University,Shaoguang 510005,Guangdong,China)

机构地区：[1]韶关学院信息工程学院,广东韶关512005

出　　处：《韶关学院学报》2024年第9期26-31,共6页Journal of Shaoguan University

基　　金：韶关市科技计划项目(210720154531311);韶关学院重点科研项目(SZ2023KJ18);韶关学院人才项目(9900064702)。

摘　　要：基于TB-SC PLDPC编码的DCO-OFDM系统,首先根据子载波的不等保护特性,提出了一种新型的载波匹配映射方案,以改善系统的性能;其次,基于改进的PEXIT算法,分析了TB-SC PLDPC码在3种不同交织方案下的译码门限值;通过理论分析可知,在16-QAM和64-QAM调制下,提出的新型载波匹配映射方案能使TB-SC PLDPC码分别在15.52 dB和19.24 dB处收敛;而采用变量点匹配映射和连续映射方案则需要更大的信噪比.仿真结果表明,提出的新型载波匹配映射方案的性能更优于变量点匹配映射和连续映射方案.Based on the TB-SC PLDPC-coded DCO-OFDM systems,we first propose a new carrier matching mapping scheme based on the unequal protection characteristics of subcarriers to improve the system performance.Then,according to the improved PEXIT,the decoding thresholds of TB-SC P-LDPC code under three different interleaving schemes are analyzed.The theoretical analysis shows that,under the 16-QAM and 64-QAM modulations,the proposed new carrier matched mapping schemes can make TB-SC PLDPC code converge at 15.52 dB and 19.24 dB,respectively,while the variable node matched mapping and continuous mapping schemes require a larger signal-to-noise ratio.The simulation results also show that the performance of the proposed new carrier matched mapping scheme is better than that of their counterparts.

关 键 词：空间耦合原模图LDPC码 直流偏置光正交频分复用 比特交织 外部互信息转移算法 

分 类 号：TN911.22[电子电信—通信与信息系统]