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Max-min fair beamforming designs of SWIPT-aided full-duplex two-way relay systems

机译：SWIPT辅助全双工双向中继系统的最大-最小公平波束成形设计

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摘要

A full-duplex two-way relaying (FD-TWR) system with an energy-constrained relay is studied with simultaneous wireless information and power transfer (SWIPT). In this network, the sources have a reliable power supply, whereas the relay has to harvest energy from the source-emitted radio-frequency signal via time switching (TS) operation. Our aim is to maximize the minimum achievable rate of the two sources by jointly optimizing the relay beamforming vector and TS ratio under the energy-harvesting-then-transmitting mode, i.e., the relay harvested energy need to meet the consumed energy. Specifically, the max–min fairness beamforming design problems are formulated for both the perfect channel state information (CSI) model and imperfect CSI model. A one-dimensional search algorithm and the semidefinite relaxation technique are proposed to solve these complex non-convex problems. It is shown that the optimal beamforming vectors and the TS ratio can always be found under the two considered CSI model. Numerical results show that the proposed two FD schemes achieve significant performance improvement compared to the traditional half-duplex (HD) scheme. Moreover, the robust scheme can get most of the performance gain of the perfect scheme. Some tradeoffs are elucidated among the achievable rate and the TS ratio, the system performance and the self-interference cancellation (SIC) level under a max–min fairness criterion.
机译：研究了带有能量受限继电器的全双工双向中继（FD-TWR）系统，同时进行无线信息和功率传输（SWIPT）。在此网络中，信号源具有可靠的电源，而继电器则必须通过时间切换（TS）操作从信号源发出的射频信号中收集能量。我们的目标是通过在能量收集-然后传输模式下，即中继收获的能量需要满足消耗的能量的情况下，共同优化中继波束成形矢量和TS比，以最大化两个源的最小可实现速率。特别是，针对完美信道状态信息（CSI）模型和不完善的CSI模型制定了最大-最小公平波束成形设计问题。提出了一种一维搜索算法和半定松弛技术来解决这些复杂的非凸问题。结果表明，在两种考虑的CSI模型下，总能找到最优的波束形成矢量和TS比。数值结果表明，与传统的半双工（HD）方案相比，提出的两种FD方案实现了显着的性能改进。而且，健壮的方案可以获得绝大部分方案的性能增益。在最大-最小公平性标准下，可以达到的速率和TS比，系统性能和自干扰消除（SIC）级别之间的权衡得到了阐明。

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