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Blind Fractionally Spaced Channel Equalization for Shallow Water PPM Digital Communications Links

机译：浅水PPM数字通信链路的盲分数间隔信道均衡

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摘要

Underwater acoustic digital communications suffer from inter-symbol interference deriving from signal distortions caused by the channel propagation. Facing such kind of impairment becomes particularly challenging when dealing with shallow water scenarios characterized by short channel coherence time and large delay spread caused by time-varying multipath effects. Channel equalization operated on the received signal represents a crucial issue in order to mitigate the effect of inter-symbol interference and improve the link reliability. In this direction, this contribution presents a preliminary performance analysis of acoustic digital links adopting pulse position modulation in severe multipath scenarios. First, we show how the spectral redundancy offered by pulse position modulated signals can be fruitfully exploited when using fractional sampling at the receiver side, which is an interesting approach rarely addressed by the current literature. In this context, a novel blind equalization scheme is devised. Specifically, the equalizer is blindly designed according to a suitably modified Bussgang scheme in which the zero-memory nonlinearity is replaced by a -memory nonlinearity, being the pulse position modulation order. Numerical results not only confirm the feasibility of the technique described here, but also assess the quality of its performance. An extension to a very interesting complex case is also provided.
机译：水下声波数字通信遭受符号间干扰，该符号间干扰源于信道传播引起的信号失真。在处理以短时相干时间和时变多径效应引起的大延迟扩展为特征的浅水场景时，面对此类损害变得尤为具有挑战性。为了减轻符号间干扰的影响并提高链路可靠性，对接收信号进行的信道均衡是一个关键问题。在这个方向上，这一贡献提出了在严重的多径情况下采用脉冲位置调制的声学数字链路的初步性能分析。首先，我们展示了在接收器端使用分数采样时如何有效地利用脉冲位置调制信号所提供的频谱冗余，这是当前文献中很少涉及的有趣方法。在这种情况下，设计了一种新颖的盲均衡方案。具体地，根据适当修改的Bussgang方案盲目的设计均衡器，其中零存储非线性被替换为作为脉冲位置调制阶数的-存储非线性。数值结果不仅证实了此处描述的技术的可行性，而且还评估了其性能的质量。还提供了对非常有趣的复杂案例的扩展。

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