Robust Molecular Communications: DFE-SPRTs and Synchronisation
Robust Molecular Communications: DFE-SPRTs and Synchronisation
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DOI：
10.1109/icc.2019.8761054
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发表时间：
2019-05
期刊：
影响因子：
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通讯作者：
Tze-Yang Tung;U. Mitra
中科院分区：
文献类型：
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作者：
Tze-Yang Tung;U. Mitra
在扩散分子通信环境中，发射器和接收器的精确同步尤其具有挑战性。为此，研究了点对点分子通信系统，其中收发器的设计提供了对同步错误的恢复能力。特别是，考虑开发基于顺序概率比测试的检测器，该检测器允许在由于接收器不同步而存在不确定性的情况下进行额外的观察，以及针对该接收器策略优化的调制设计。利用了分子在特定时隙内击中接收器的概率的结构。导出同步误差的近似最大对数似然估计器并计算 Cramér-Rao 界（CRB），以表明所提出的估计器的性能在低传输速率下接近 CRB。所提出的接收器和调制设计在与基于决策反馈的接收器相同的数据速率下实现了异步检测性能的显着提高，平均提高了 3 至 5 倍。
Precise synchronisation of transmitters and receivers is particularly challenging in diffusive molecular communication environments. To this end, a point-to-point molecular communication system is examined wherein the design of the transceiver offers resilience to synchronisation errors. In particular, the development of a sequential probability ratio test-based detector, which allows for additional observations in the presence of uncertainty due to mis-synchronisation at the receiver, and a modulation design which is optimised for this receiver strategy, is considered. The structure of the probability of molecules hitting a receiver within a particular time slot is exploited. An approximate maximum log-likelihood estimator for the synchronisation error is derived and the Cramér-Rao bound (CRB) computed, to show that the performance of the proposed estimator is close to the CRB at low transmission rates. The proposed receiver and modulation designs achieve strongly improved asynchronous detection performance for the same data rate as a decision feedback based receiver by a factor of 3 to 5 on average.