Stochastic Interference Modeling and Experimental Validation for Pulse-Based Terahertz Communication
Stochastic Interference Modeling and Experimental Validation for Pulse-Based Terahertz Communication
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DOI：
10.1109/twc.2019.2920965
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发表时间：
2019-08
影响因子：
10.4
通讯作者：
Z. Hossain;Carley Mollica;J. Federici;J. Jornet
中科院分区：
文献类型：
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作者：
Z. Hossain;Carley Mollica;J. Federici;J. Jornet
通过采用时间上扩展的开关键控调制来传输100飞秒长的脉冲，已被提议作为实现太赫兹（THz）频段（0.1 - 10太赫兹）短距离通信的一种方式。由于用户占用信道的时间极短，这种调制将冲突概率降至最低。然而，鉴于许多设想的应用涉及极高的节点密度，多用户干扰变得不可避免。本文构建了一个多用户干扰的随机模型，并通过实验进行了验证。该模型考虑到这样一个事实，即接收器处的干扰功率并非各个节点接收功率的简单叠加，而是接收信号幅度叠加后的功率。为此，首先构建一个数学框架，从接收到的脉冲能量的概率密度函数（PDF）和脉冲形状的PDF出发，计算单个干扰节点在接收器处产生的干扰的概率密度函数。然后，将该模型扩展以考虑多个节点可能产生的相长或相消干扰。所构建的模型通过一种创新的实验装置进行了实验验证，并给出了大量数值结果，以分析基于脉冲的太赫兹通信中多用户干扰的趋势。
The transmission of one-hundred-femtosecond-long pulses by following an ON-OFF keying modulation spread in time has been proposed as a way to enable Terahertz (THz)-band (0.1–10 THz) communications over short distances. Such modulation minimizes the probability of collisions due to the very small time that the channel is occupied by a user. However, given that many of the envisioned applications involve very large node densities, multi-user interference becomes unavoidable. In this paper, a stochastic model of multi-user interference is developed and experimentally validated. The model takes into account the fact that the interference power at the receiver is not a combination of the received powers from the individual nodes, but the power of the combination of the received signal amplitudes. For this, first, a mathematical framework is developed to compute the probability density function (PDF) of the interference generated by one interfering node at the receiver, starting from the PDFs of the pulse received energy and the PDF of the pulse shape. Then, the model is extended to account for multiple nodes which can constructively or destructively interfere. The developed model is experimentally validated by means of an innovative setup and the extensive numerical results are provided to analyze the trends of multi-user interference in pulse-based THz communications.