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On Advanced FEC and Coded Modulation for Ultra-High-Speed Optical Transmission

机译：用于超高速光传输的高级FEC和编码调制

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This tutorial paper presents an overview of advanced FEC and coded modulation (CM) for optical communications. It describes the following ultra-high-speed optical transport enabling techniques: codes on graphs (turbo-product and LDPC codes), rate-adaptive CM, and turbo equalization. Given the high potential of LDPC codes, several binary and nonbinary LDPC decoding algorithms are described and FPGA implementation is also discussed. We then demonstrate that some recently proposed attractive LDPC codes could in fact be represented as special instances of irregular quasi cyclic (QC)-LDPC codes from pairwise balanced designs (PBDs). In addition, we describe several LDPC-coded modulation schemes, including hybrid multidimensional CM, block-interleaved CM, multilevel coding, nonbinary (NB) LDPC-CM, and multilevel NB-LDPC-CM. We also demonstrate the application of turbo equalization and rate-adaptive coding in high-speed optical transmission to deal with fiber nonlinearities. Finally, an optimized signal constellation design approach as well as an optimized mapping rule has been discussed.
机译：本教程文件概述了用于光通信的高级FEC和编码调制（CM）。它描述了以下超高速光传输启用技术：图形代码（涡轮乘积和LDPC代码），速率自适应CM和涡轮均衡。考虑到LDPC码的潜力，本文描述了几种二进制和非二进制LDPC解码算法，并讨论了FPGA实现。然后，我们证明了一些最近提出的有吸引力的LDPC码实际上可以表示为成对平衡设计（PBD）中的不规则准循环（QC）-LDPC码的特殊情况。另外，我们描述了几种LDPC编码的调制方案，包括混合多维CM，块交织CM，多层编码，非二进制（NB）LDPC-CM和多层NB-LDPC-CM。我们还演示了Turbo均衡和速率自适应编码在高速光传输中处理光纤非线性的应用。最后，讨论了一种优化的信号星座图设计方法以及一种优化的映射规则。

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