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arXiv 1902.09778eess.SP
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无线供电干扰信道的吞吐量优化

Throughput Optimization for Wireless Powered Interference Channels

Omid Rezaei, Mohammad Mahdi Naghsh, Zahra Rezaei, Rui Zhang

摘要:

本文研究了一种通用的多用户无线功率干扰信道(IFC),其信道相干时间内的通信包括两个阶段,即无线能量传输(WET)和无线信息传输(WIT)。在第一阶段中,所有能量发射器(ET)经由协作波形设计将能量信号发射到信息发射器(IT),而在第二阶段中,每个IT使用在前一阶段中收获的能量将信息信号发射到其预期的ET。其目的是联合设计WET-WIT时间分配,在第一阶段的(确定性)发送信号,以及在第二阶段的IT的发送功率,以优化网络吞吐量。设计问题是非凸的,因此很难全局求解。为了处理这些问题,我们提出了有效的迭代算法交替投影的基础上,然后,优化最小化技术是用来解决在每次迭代的非凸子问题。我们还扩展了设计方法,考虑不完善的信道状态信息(CSI)和能量收集电路的非线性。所提出的算法是局部收敛的,可以提供高质量的次优解的设计问题。仿真结果表明了所提出的算法在各种设置下的有效性。

英文摘要:

This paper studies a general multi-user wireless powered interference channel (IFC) under the harvest-then-transmit protocol, where the communication in channel coherence time consists of two phases, namely wireless energy transfer (WET) and wireless information transfer (WIT). In the first phase, all energy transmitters (ETs) transmit energy signals to information transmitters (ITs) via collaborative waveform design, while in the second phase, each IT transmits an information signal to its intended ET using the harvested energy in the previous phase. The aim is to jointly design the WET-WIT time allocation, the (deterministic) transmit signal at the first phase, and the transmit power of ITs in the second phase to optimize the network throughput. The design problems are non-convex and hence difficult to solve globally. To deal with them, we propose efficient iterative algorithms based on alternating projections; then, the majorization-minimization technique is used to tackle the nonconvex sub-problems in each iteration. We also extend the devised design methodology by considering imperfect channel state information (CSI) and non-linearity in energy harvesting circuit. The proposed algorithms are locally convergent and can provide high-quality suboptimal solutions to the design problems. Simulation results show the effectiveness of the proposed algorithms under various setups.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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