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Multiuser MIMO Wireless Energy Transfer With Coexisting Opportunistic Communication

机译:共存机会通信的多用户MIMO无线能量传输

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摘要

This letter considers spectrum sharing between a multiuser multiple-input multiple-output (MIMO) wireless energy transfer (WET) system and a coexisting point-to-point MIMO wireless information transmission (WIT) system, where WET generates interference to WIT and degrades its throughput performance. We show that due to the interference, the WIT system suffers from a loss of the degrees of freedom (DoF) proportional to the number of energy beams sent by the energy transmitter (ET), which, in general, needs to be larger than one to optimize the multiuser WET with user fairness consideration. To minimize the DoF loss in WIT, we further propose a new single-beam energy transmission scheme based on the principle of time sharing, where the ET transmits one of the optimal energy beams at each time. This new scheme achieves the same optimal performance for the WET system, and minimizes the impact of its interference to the WIT system.
机译:这封信考虑了多用户多输入多输出(MIMO)无线能量传输(WET)系统和共存的点对点MIMO无线信息传输(WIT)系统之间的频谱共享,其中WET对WIT产生干扰并降低其质量吞吐量性能。我们表明,由于干扰,WIT系统遭受的自由度(DoF)的损失与能量发送器(ET)发送的能量束的数量成比例,通常,该自由度必须大于1通过考虑用户公平性来优化多用户WET。为了使WIT中的DoF损失最小化,我们进一步基于分时原理提出了一种新的单束能量传输方案,其中ET每次都传输一个最佳能量束。该新方案为WET系统实现了相同的最佳性能,并将干扰对WIT系统的影响降至最低。

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