网格编码调制星座整形相位共轭孪生波方案

Trellis coding modulation constellation shaping phase conjugate twin wave scheme

为了进一步提升正交频分复用(OFDM)在密集波分复用(DWDM)光纤通信系统中的表现,提出了一种基于16进制振幅移相键控(16APSK)的多维网格编码调制(TCM)星座整形相位共轭孪生波(PCTW)方案,并设计了一种基于OFDM子载波的多维哈夫曼概率整形(PS)方法。通过使用Matlab与OptiSystem构建仿真平台,对比分析了实施星座整形前后的系统性能。仿真实验结果表明:相比于未采用任何星座整形技术的系统,引入多维哈夫曼PS和几何整形策略后系统的频谱效率虽有所下降(减少了0.04),但误符号率显著降低了10.7 dB。

In order to further improve the performance of orthogonal frequency division multiplexing(OFDM)in dense wavelength division multiplexing(DWDM)fiber optic communication systems,a multi-dimensional trellis coding modulation(TCM)constellation shaping phase conjugate twin waves(PCTW)scheme based on hexadecimal amplitude phase shift keying(16APSK)is proposed,and a multi-dimensional Huffman probability shaping(PS)method based on OFDM subcarriers is designed.By using Matlab and OptiSystem to build a simulation platform,the system performance before and after implementing constellation shaping is compared and analyzed.The simulation experiment results show that compared with the system without any constellation shaping technology,the introduction of multidimensional Huffman PS and geometric shaping strategy reduces the spectral efficiency of the system by 0.04,but significantly reduces the symbol error rate by 10.7 dB.