相位噪声下双星星座超越标准量子极限的研究
Beating the Standard Quantum Limit for Binary Constellations in the Presence of Phase Noise
摘要：
非传统的接收器能够降低光通信系统中的错误率低于标准量子限制（SQL），通过实施的星座符号，超出了规范的测量信息承载量，如强度或正交的电磁场的歧视策略。这种策略的一个例子是在这里提出的平均功率受限的二进制星座通过相位噪声信道传播。接收器在复振幅平面中实现相干位移，然后进行光子数分辨检测，可以被视为直接检测和零差检测之间的插值。
英文摘要：
Unconventional receivers enable reduction of error rates in optical communication systems below the standard quantum limit (SQL) by implementing discrimination strategies for constellation symbols that go beyond the canonical measurement of information-carrying quantities such as the intensity or quadratures of the electromagnetic field. An example of such a strategy is presented here for average-power constrained binary constellations propagating through a phase noise channel. The receiver, implementing a coherent displacement in the complex amplitude plane followed by photon number resolved detection, can be viewed as an interpolation between direct detection and homodyne detection.
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