A Low Complexity Antenna Switching for Joint Wireless Information and Energy Transfer in MIMO Relay Channels
A Low Complexity Antenna Switching for Joint Wireless Information and Energy Transfer in MIMO Relay Channels
复制标题
DOI：
10.1109/tcomm.2014.032914.130722
复制
发表时间：
2014-04
影响因子：
8.3
通讯作者：
I. Krikidis;S. Sasaki;S. Timotheou;Z. Ding
中科院分区：
文献类型：
--
作者：
I. Krikidis;S. Sasaki;S. Timotheou;Z. Ding
本文研究了一种在多输入多输出中继信道中实现无线信息和能量同步传输的低复杂度技术。所提出的技术利用中继节点的阵列配置，并将天线单元用于常规解码或整流（整流天线）。为了保持较低的复杂度，提出了一种基于广义选择组合器（GSC）原理的天线在解码/整流之间的动态切换；L最强路径分配用于解码，而剩余的通道路径用于整流（反之亦然）。通过理论和数值结果研究了最优L和使中断概率最小的分配策略。此外，分别通过求解线性规划问题和二进制背包问题，提出了在不受GSC限制的情况下提供最优性能的两个性能界。提出的技术扩展到多用户干扰的场景，其中在中继节点使用零强迫接收器；本文还推导了停电概率的封闭表达式。
In this paper, we investigate a low-complexity technique for simultaneous wireless information and energy transfer in multiple-input multiple-output relay channels. The proposed technique exploits the array configuration at the relay node and uses the antenna elements either for conventional decoding or for rectifying (rectennas). In order to keep the complexity low, a dynamic antenna switching between decoding/rectifying is proposed based on the principles of the generalized selection combiner (GSC); the L strongest paths are allocated for decoding while the remaining channel paths for rectifying (and vice versa). The optimal L as well as the allocation strategy that minimizes the outage probability are investigated via theoretical and numerical results. In addition, two performance bounds that provide the optimal performance without the limitation of GSC are proposed by solving a linear programming and a binary knapsack problem, respectively. The proposed technique is extended to scenarios with multi-user interference, where a zero-forcing receiver is used at the relay node; closed-forms expressions for the outage probability are also derived.