Enhancing Wireless Information and Power Transfer by Exploiting Multi-Antenna Techniques
Enhancing Wireless Information and Power Transfer by Exploiting Multi-Antenna Techniques
复制标题
利用多天线技术增强无线信息和电力传输
DOI：
10.1109/mcom.2015.7081086
复制
发表时间：
2015-04-01
影响因子：
11.2
通讯作者：
Zhang, Huazi
中科院分区：
文献类型：
--
作者：
Chen, Xiaoming;Zhang, Zhaoyang;Zhang, Huazi
本文回顾了一种新兴的无线信息和功率传输（WIPT）技术，重点介绍了其性能的增强采用多天线技术。与传统的无线信息传输相比，WIPT面临着许多挑战。首先，它更容易受到信道衰落和路径损耗的影响，从而导致更短的功率传输距离。其次，它产生了如何平衡信息传输的频谱效率和功率传输的能量效率以获得最佳折衷的问题。第三，为了提高功率传输效率，存在用于信息传输的安全问题。在这种情况下，多天线技术，例如能量波束成形，被引入到解决这些问题，通过利用空间自由度。本文介绍了基于多天线的WIPT技术的各个方面，重点介绍了通过参数优化和协议设计来应对挑战。特别是，我们研究了基于两种典型的多天线技术的WIPT权衡：用于短距离传输的有限反馈多天线技术;和用于长距离传输的大规模多输入多输出（LS-MIMO，也称为大规模MIMO）技术。仿真结果验证了所提方案的有效性。
This article reviews an emerging wireless information and power transfer (WIPT) technique with an emphasis on its performance enhancement employing multi-antenna techniques. Compared to traditional wireless information transmission, WIPT faces numerous challenges. First, it is more susceptible to channel fading and path loss, resulting in a much shorter power transfer distance. Second, it gives rise to the issue of how to balance spectral efficiency for information transmission and energy efficiency for power transfer in order to obtain an optimal tradeoff. Third, there exists a security issue for information transmission in order to improve power transfer efficiency. In this context, multi-antenna techniques, e.g. energy beamforming, are introduced to solve these problems by exploiting spatial degree of freedom. This article provides a tutorial on various aspects of multi-antenna based WIPT techniques, with a focus on tackling the challenges by parameter optimization and protocol design. In particular, we investigate the WIPT tradeoffs based on two typical multi-antenna techniques: the limited feedback multi-antenna technique for short-distance transfer; and the large-scale multiple-input multiple-output (LS-MIMO, also known as massive MIMO) technique for long-distance transfer. Finally, simulation results validate the effectiveness of the proposed schemes.