韶关学院学报2024，Vol.45Issue(9) ：26-31.

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

戴林 罗忠亮 李丹
韶关学院学报2024，Vol.45Issue(9) ：26-31.
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  • 维普
  • 万方数据

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

戴林 1罗忠亮 1李丹1
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作者信息

  • 1. 韶关学院信息工程学院,广东韶关 512005
  • 折叠

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.

Abstract

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

Key words

spatially coupled protograph LDPC code/direct current optical orthogonal frequency division multiplex/bit interleaving/extrinsic information transfer algorithm

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出版年

2024
韶关学院学报
韶关学院

韶关学院学报

影响因子：0.28
ISSN：1007-5348
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