流致扩散移动分子通信：首击时间及性能分析
On Flow-Induced Diffusive Mobile Molecular Communication: First Hitting Time and Performance Analysis
摘要：
这项工作考虑了各种流动性条件下的流动诱导扩散分子通信问题，例如（i）发射器（TX）和接收器（RX）纳米机器都是移动的，（ii）TX是移动的，RX是固定的，（iii）TX是固定的，RX是移动的。通过使用具有正漂移的布朗运动来表征纳米机器和信息分子的运动，推导出上述移动场景下的第一命中时间的概率密度函数（PDF）的封闭形式表达式。导出的PDF表达式通过基于粒子的模拟进行验证。在此基础上，研究了流致扩散通道中开关键控（OOK）调制的分子通信性能。特别是，封闭形式的表达式的检测和虚警的概率与最佳李克维比检验（LRT）为基础的决策规则，错误的概率，并在存在符号间干扰，计数错误，和来自其他来源的噪声的能力。仿真结果验证了理论结果，并产生不同的移动性条件下的系统性能的见解。
英文摘要：
This work considers the problem of flow-induced diffusive molecular communication under various mobility conditions such as (i) both transmitter (TX) and receiver (RX) nanomachines are mobile, (ii) TX is mobile and RX is fixed, and (iii) TX is fixed and RX is mobile. Closed-form expressions for the probability density function (PDF) of the first hitting time under the aforementioned mobile scenarios are derived, by characterizing the movement of the nanomachines and information molecules using Brownian motion with positive drift. The derived PDF expressions are validated through particle-based simulations. Based on these results, the performance of molecular communication with on-off keying (OOK) modulation in flow-induced diffusive channels is investigated. In particular, closed-form expressions for the probabilities of detection and false alarm with optimal Likelihood ratio test (LRT) based decision rule, probability of error, and the capacity in the presence of inter-symbol interference, counting errors, and noise from the other sources are derived. Simulation results are presented to verify the theoretical results and to yield insights into the system performance for different mobility conditions.
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