| 程智慧,白成林,罗清龙,孙文涛.改进型多元QC-LDPC码的构造及其在PDM-CO-OFDM系统中的应用[J].光电子激光,2015,26(6):1094~1099 |
| 改进型多元QC-LDPC码的构造及其在PDM-CO-OFDM系统中的应用 |
| Improved nonbinary QC-LDPC code construction for PDM-CO-OFDM system |
| 投稿时间：2015-03-03 |
| DOI： |
| 中文关键词: 改进型多元准循环LDPC(NB-QC-LDPC)码 偏振复用的相干光正交频分复用(PDM-CO-OFD M)系统 置换多项式 性能分析 |
| 英文关键词:improved nonbinary quasi-cyclic low-density parity-check (NB-QC-LDPC)code polarization division multiplexing and coherent optical orthogonal frequency di vision multiplexing (PDM-CO-OFDM) system permutation polynomials performance analysis |
| 基金项目:国家自然科学基金重点项目(61431009)和山东省自然科学基金面上项目(ZR2012AM020)资助项目 (聊城大学 物理科学与信息工程学院,山东省光通信科学与技术重点实验室,山东 聊城 252059) |
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| 中文摘要: |
| 位长度相同的多元LDPC(NB-LDPC)码优于相应的二 元LDPC(B-LDPC)码,但是它的实现复杂度相对较高。为了降低NB- LDPC码的实现复杂度,提高系统的编码增益,利用置换多项式的方法对一般多元准循 环LDPC(NB-QC-LDPC)码进行改进,并将改进后的NB-QC-LDPC码应用于基于偏振复用的 相干光正交频分复用(PDM-CO-OFDM)系统中,详细研究了其传输性能。仿真结果表明:基于GF(4) QC-LDPC 编码的系统性能 明显优于相应的B-QC-LDPC编码的系统性能,而且基于改进型GF(4) QC-LDPC编码的 系统与 一般GF(4) QC-LDPC编码的系统相比,其误码性能可改善0.65dB, 频谱效率提高了2.16bit/s/Hz,抑制信道色散能力和运转复杂度也 均得到了改善。 |
| 英文摘要: |
| The performance of nonbinary low-density parity-check (LDPC) codes is obviousl y better than that of binary LDPC codes with the same bit length,but nonbinary LDPC codes have relatively high im plementation complexity.In order to reduce the implementation complexity of nonbinary LDPC codes and improv e the coding gain of the system,this paper adopts permutation polynomial method in order to impr ove the general nonbinary quasi-cyclic LDPC (QC-LDPC) codes.And the improved nonbinary QC-LDPC codes a re then applied to coherent optical orthogonal frequency division multiplexing system with polarization division mul tiplexing (PDM-CO-OFDM) to study the transmission performance of PDM-CO-OFDM system in detail. According to the simulation results,we can find that the system based on GF (4) QC-LDPC encoding is obviously better than that employing corresponding binary QC-LDPC codes.And compar ed with the system encoded by general GF(4) QC-LDPC codes,the system encoded by improved GF(4) QC-LDPC code s has error performance improvement over 0.65dB,spectral efficiency improvement of 2.16bit/s/Hz and ha s the improvement obviously in inhibition of the channel dispersion ability and implementation complexity.T herefore,nonbinary QC-LDPC codes constructed by the method based on permutation polynomial have broad application prospects in optical fiber communication syst ems. |
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