Constellation Optimization for Phase-Shift Keying Coherent States With Displacement Receiver to Maximize Mutual Information
Constellation Optimization for Phase-Shift Keying Coherent States With Displacement Receiver to Maximize Mutual Information
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DOI：
10.1109/access.2020.3044086
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发表时间：
2020
期刊：
影响因子：
3.9
通讯作者：
R. Bhadani;I. Djordjevic
中科院分区：
文献类型：
--
作者：
R. Bhadani;I. Djordjevic
量子信息理论中的一个重要问题是采用合适的码字、接收机设计和星座优化技术来找到光通信信道的最佳可能容量。在本文中，我们推导出一种替代的信道容量，CG，相移键控相干态与可实现的位移接收机通过最大化的符号先验和预检测位移的互信息。我们发现，CG是高于通过最大化互信息的符号先验，但零位移所实现的容量。整个方案演示了设计一种改进的，但易于实现的接收器，通过调整它在不同的光子数制度，以获得更好的通信性能。此外，我们提出了一个比较分析CG与现有的接收机设计。我们扩展我们的研究，以占探测器的缺陷。量子信息理论，QPSK，BPSK，互信息，信道容量，优化。
An important problem in quantum information theory is finding the best possible capacity of the optical communication channel employing suitable codewords, receiver design, and constellation optimization techniques. In this paper, we derive an alternative channel capacity, CG, of phase-shift keying coherent state with a realizable displacement receiver by maximizing mutual information over symbol priors and pre-detection displacement. We find that CG is higher than the capacity achieved by maximizing mutual information over symbol prior but with zero displacement. The overall scheme demonstrates designing an improved, yet easy-to-implement receiver for better communication performance by tuning it at different photon number regime. Further, we present a comparative analysis of CG with existing receiver designs. We extend our study to account for detector imperfections. INDEX TERMS Quantum Information Theory, QPSK, BPSK, Mutual Information, Channel Capacity, Optimization.