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Advanced GF(3^2) nonbinary LDPC coded modulation with non-uniform 9-QAM outperforming star 8-QAM

机译:具有非均匀9-QAM性能优于星形8-QAM的高级GF(3 ^ 2)非二进制LDPC编码调制

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摘要

In this paper, we first describe a 9-symbol non-uniform signaling scheme based on Huffman code, in which different symbols are transmitted with different probabilities. By using the Huffman procedure, prefix code is designed to approach the optimal performance. Then, we introduce an algorithm to determine the optimal signal constellation sets for our proposed non-uniform scheme with the criterion of maximizing constellation figure of merit (CFM). The proposed nonuniform polarization multiplexed signaling 9-QAM scheme has the same spectral efficiency as the conventional 8-QAM. Additionally, we propose a specially designed GF(32) nonbinary quasi-cyclic LDPC code for the coded modulation system based on the 9-QAM non-uniform scheme. Further, we study the efficiency of our proposed non-uniform 9-QAM, combined with nonbinary LDPC coding, and demonstrate by Monte Carlo simulation that the proposed GF(23) nonbinary LDPC coded 9-QAM scheme outperforms nonbinary LDPC coded uniform 8-QAM by at least 0.8dB. (C) 2016 Optical Society of America
机译:在本文中,我们首先描述了一种基于霍夫曼码的9符号非均匀信令方案,其中以不同的概率传输不同的符号。通过使用霍夫曼过程,前缀代码被设计为达到最佳性能。然后,我们引入了一种算法,该算法以最大化星座图品质因数(CFM)的准则为我们提出的非均匀方案确定最佳信号星座图集。所提出的非均匀偏振复用信令9-QAM方案具有与常规8-QAM相同的频谱效率。此外,我们提出了一种特殊设计的GF(32)非二进制准循环LDPC码,用于基于9-QAM非均匀方案的编码调制系统。此外,我们研究了我们提出的非均匀9-QAM与非二进制LDPC编码相结合的效率,并通过蒙特卡罗模拟证明了所提出的GF(23)非二进制LDPC编码的9-QAM方案优于非二进制LDPC编码的统一8-QAM至少降低0.8dB。 (C)2016美国眼镜学会

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