论文标题
纤维非线性通过短长度的概率星座塑造用于试验的信号传导
Fiber Nonlinearity Mitigation by Short-Length Probabilistic Constellation Shaping for Pilot-Aided Signaling
论文作者
论文摘要
概率星座塑形（PCS）对均匀信号传导的性能有了显着改善。最近发现，在非线性纤维通道上传输时，不需要长块即可获得最大的成型增益，因为短长度可以有效地减轻纤维非线性干扰（NLI）。这种行为的原因是，短长的PC在形状的发射序列中隐式诱导某些时间特性，这些序列对光纤通道有益。为了实现高阶QAM的强大数据辅助数字信号处理，通常将定期的第四纪相移键控飞行员插入到高阶QAM传输序列中。在这项工作中，我们在模拟中调查了这种试验辅助信号对NLI缓解措施的影响。尽管改变了形状发射序列的时间特性，但发现1/32的试验速率不会改变短长度的有益效应。这一发现的操作意思是，即使使用试验辅助信号，也不需要长的PCS块长度来最大程度地增益。
Probabilistic constellation shaping (PCS) offers a significant performance improvement over uniform signaling. It was recently discovered that long blocks are not required to achieve maximum shaping gain when transmitting over the nonlinear fiber channel because short-length PCS effectively mitigates fiber nonlinear interference (NLI). The reason for this behavior is that short-length PCS implicitly induces some temporal properties in the shaped transmit sequence that are beneficial for the fiber-optic channel. To achieve robust data-aided digital signal processing of high-order QAM, periodic quaternary phase shift keying pilots are typically inserted into the high-order QAM transmit sequence. In this work, we investigate in simulations the effect of such pilot-aided signaling on NLI mitigation. Albeit modifying the temporal properties of the shaped transmit sequence, a pilot rate of 1/32 is found to not alter the beneficial effects of short-length PCS. The operation meaning of this finding is that even with pilot-aided signaling, long PCS block lengths are not required for maximum shaping gain.
