Joint Wireless Information and Power Transfer for an Autonomous Multiple Antenna Relay System
Joint Wireless Information and Power Transfer for an Autonomous Multiple Antenna Relay System
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DOI：
10.1109/lcomm.2015.2428252
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发表时间：
2015-04
期刊：
影响因子：
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通讯作者：
Yang Huang;B. Clerckx
中科院分区：
文献类型：
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作者：
Yang Huang;B. Clerckx
考虑到三节点多天线中继系统，这封信提出了一种两阶段放大转发（AF）中继协议，该协议使自主中继能够同时从源信息信号和能量信号中获取无线功率目的地。我们首先研究这种能量流辅助（EFA）中继在单输入单输出（SISO）继电器系统，并以最大化的速率。通过将优化问题转化为一个等价的凸形式，可以得到一个全局最优解，并将其推广到多天线中继系统。中继处理矩阵被优化以最大化速率。通过线性代数运算，利用特征值分解法可以有效地求解优化问题。可以观察到，能量流的益处仅在多天线的情况下才有趣地示出，并且可以揭示，通过利用信号空间，可以几乎分离中继处的接收信息信号和能量泄漏，使得可以以较大的系数放大期望的信号。
Considering a three-node multiple antenna relay system, this letter proposes a two-phase amplify-and-forward (AF) relaying protocol, which enables the autonomous relay to simultaneously harvest wireless power from the source information signal and from an energy signal conveyed by the destination. We first study this energy-flow-assisted (EFA) relaying in a single-input single-output (SISO) relay system and aim at maximizing the rate. By transforming the optimization problem into an equivalent convex form, a global optimum can be found. We then extend the protocol to a multiple antenna relay system. The relay processing matrix is optimized to maximize the rate. The optimization problem can be efficiently solved by eigenvalue decomposition, after linear algebra manipulation. It is observed that the benefits of the energy flow are interestingly shown only in the multiple antenna case, and it is revealed that the received information signal and the energy leakage at the relay can be nearly separated by making use of the signal space, such that the desired signal can be amplified with a larger coefficient.