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arXiv 1402.6441cs.ITmath.IT
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干扰信道下的协同无线能量和信息传输

Collaborative Wireless Energy and Information Transfer in Interference Channel

Seunghyun Lee, Liang Liu, Rui Zhang

摘要:

研究了多用户无线通信系统中的无线信息与能量同步传输(SWIPT)问题,即分布式发射机向各自的接收机发送独立的信息,同时通过能量波束形成向接收机协同传输无线能量。因此,从无线信息传输(WIT)的角度来看,感兴趣的系统可以被建模为经典的干扰信道,同时它也可以被视为用于协作无线能量传输(WET)的分布式多输入多输出(MIMO)系统。为了在SWIPT中实现信息解码(ID)和能量收集(EH),我们在每个接收器处采用低复杂度时间切换操作以在预定时间内在ID和EH模式之间切换。基于这种混合模型,我们的目标是在不同的发送端协作方案下的多用户SWIPT系统中的可实现的速率-能量(R-E)的权衡。具体而言,为了促进协作能量波束成形,我们提出了一种新的信号分裂方案在发射机,其中每个发射信号通常是由一个信息信号分量和能量信号分量分别为WIT和WET。在此基础上,我们首先研究了两用户SWIPT系统,推导了接收端的最优模式切换规则和相应的发射信号优化,以实现衰落信道下各种R-E折衷。我们还比较了我们提出的方案的R-E性能与发射能量波束成形和信号分裂对两个现有的计划与部分或没有合作的发射机,并显示出显着的收益超过这些基线计划。最后,研究了多用户SWIPT系统的一般情况,提出并比较了两种实用的传输协作方案。

英文摘要:

This paper studies the simultaneous wireless information and power transfer (SWIPT) in a multiuser wireless system, in which distributed transmitters send independent messages to their respective receivers, and at the same time cooperatively transmit wireless power to the receivers via energy beamforming. Accordingly, from the wireless information transmission (WIT) perspective, the system of interest can be modeled as the classic interference channel, while it also can be regarded as a distributed multiple-input multiple-output (MIMO) system for collaborative wireless energy transmission (WET). To enable both information decoding (ID) and energy harvesting (EH) in SWIPT, we adopt the low-complexity time switching operation at each receiver to switch between the ID and EH modes over scheduled time. Based on this hybrid model, we aim to characterize the achievable rate-energy (R-E) trade-offs in the multiuser SWIPT system under various transmitter-side collaboration schemes. Specifically, to facilitate the collaborative energy beamforming, we propose a new signal splitting scheme at the transmitters, where each transmit signal is generally composed of an information signal component and an energy signal component for WIT and WET, respectively. With this new scheme, first, we study the two-user SWIPT system and derive the optimal mode switching rule at the receivers and the corresponding transmit signal optimization to achieve various R-E trade-offs over the fading channel. We also compare the R-E performance of our proposed scheme with transmit energy beamforming and signal splitting against two existing schemes with partial or no cooperation of the transmitters, and show remarkable gains over these baseline schemes. Finally, the general case of SWIPT systems with more than two users is studied, for which we propose and compare two practical transmit collaboration schemes.

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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