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Interplay of Probabilistic Shaping and the Blind Phase Search Algorithm. (arXiv:1803.05957v1 [eess.SP])
来源于:arXiv
Probabilistic shaping (PS) is a promising technique to approach the Shannon
limit using typical constellation schemes. However, the impact of PS on the
chain of signal processing algorithms of a coherent receiver still needs
further investigation. In this work we study the interplay of PS and phase
recovery using the blind phase search (BPS) algorithm, which is currently a
de-facto standard in optical communications systems. We first investigate a
supervised phase search (SPS) algorithm as a theoretical upper bound on the BPS
performance, assuming perfect decisions. It is shown that PS influences the SPS
algorithm, but its impact can be alleviated by moderate noise-rejection window
sizes. On the other hand, BPS is affected by PS even for long windows because
of correlated erroneous decisions in the phase recovery scheme. The simulation
results also showed, for investigated constellations, that the
capacity-maximizing shaping is near to the worst-case situation for BPS,
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