标题： 基于图的鲁棒LDPC码设计，用于通过概率成形进行速率自适应 显示英文标题

标题： Design of Robust, Protograph Based LDPC Codes for Rate-Adaptation via Probabilistic Shaping

摘要： 在本工作中，考虑了通过概率成形实现速率自适应通信的鲁棒、基于图的低密度奇偶校验（LDPC）码的设计。最近，Böcherer等人引入了概率幅度成形（PAS），用于具有比特解映射器和二进制解码器的接近容量和速率自适应通信。作者之前的工作考虑了基于图的LDPC码在PAS和特定频谱效率（SEs）下的优化，以联合优化LDPC码节点度数和编码比特到比特交织编码调制（BICM）比特信道的映射。我们表明，当在其他速率下运行时，这些码的表现较差，并通过差分进化在搜索良好基于图的集合中采用最小最大方法来设计鲁棒的LDPC码。所考虑的设计使用单个16电平移位键控（ASK）星座和一个鲁棒的13/16速率LDPC码，在0.7到2.7比特每信道使用之间运行。对于16224比特的块长度和目标帧错误率为1e-3，所提出的码在0.7到1.3 bpcu范围内距离连续AWGN容量1.32 dB以内，在1.3 bpcu到2.7 bpcu范围内距离连续AWGN容量1.05 dB以内。 显示英文摘要

摘要： In this work, the design of robust, protograph-based low-density parity-check (LDPC) codes for rate-adaptive communication via probabilistic shaping is considered. Recently, probabilistic amplitude shaping (PAS) by B\"ocherer et al. has been introduced for capacity approaching and rate-adaptive communication with a bitwise-demapper and binary decoder. Previous work by the authors considered the optimization of protograph based LDPC codes for PAS and specific spectral efficiencies (SEs) to jointly optimize the LDPC code node degrees and the mapping of the coded bits to the bit-interleaved coded modulation (BICM) bit-channels. We show that these codes tend to perform poor when operated at other rates and propose the design of robust LDPC codes by employing a min-max approach in the search for good protograph ensembles via differential evolution. The considered design uses a single 16 amplitude-shift-keying (ASK) constellation and a robust 13/16 rate LDPC code to operate between 0.7 to 2.7 bits per channel use. For a blocklength of 16224 bits and a target frame error rate of 1e-3 the proposed code operates within 1.32 dB of continuous AWGN capacity for 0.7 to 1.3 bpcu and within 1.05 dB for 1.3 bpcu to 2.7 bpcu.