Spectral and Energy Efficiencies in Full-Duplex Wireless Information and Power Transfer
Spectral and Energy Efficiencies in Full-Duplex Wireless Information and Power Transfer
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DOI：
10.1109/tcomm.2017.2665488
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发表时间：
2017-05
影响因子：
8.3
通讯作者：
Van-Dinh Nguyen;T. Duong;H. Tuan;Oh-Soon Shin;H. Poor
中科院分区：
文献类型：
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作者：
Van-Dinh Nguyen;T. Duong;H. Tuan;Oh-Soon Shin;H. Poor
通信系统被认为由全双工多天线基站（BS）和多个单天线下行链路用户（DLU）和单天线上行链路用户（ULU）组成，其中后者需要收获能量以用于向BS发送信息。因此，通信分为两个阶段。在第一阶段中，BS使用所有可用天线分别经由信息和能量波束成形来向DLU传送信息并向ULU传送无线能量。在第二阶段中，ULU使用其收集的能量将其独立信息发送到BS，而BS将信息发送到DLU。在这两个阶段中，通信在相同的时间和相同的频带上操作。其目的是通过联合优化波束成形和时间分配，在ULU可实现的信息吞吐量约束下最大化总速率和能量效率。由于效用函数是非凹的，且所涉及的约束条件也是非凸的，因此这些问题在计算上是很麻烦的。为了解决这些问题，提出了路径跟踪算法，以至少达到局部最优。所提出的算法迭代地提高目标的收敛性保证。仿真结果表明，他们实现快速收敛，优于传统的解决方案。
A communication system is considered consisting of a full-duplex multiple-antenna base station (BS) and multiple single-antenna downlink users (DLUs) and single-antenna uplink users (ULUs), where the latter need to harvest energy for transmitting information to the BS. The communication is thus divided into two phases. In the first phase, the BS uses all available antennas for conveying information to DLUs and wireless energy to ULUs via information and energy beamforming, respectively. In the second phase, ULUs send their independent information to the BS using their harvested energy while the BS transmits the information to the DLUs. In both the phases, the communication is operated at the same time and over the same frequency band. The aim is to maximize the sum rate and energy efficiency under ULU achievable information throughput constraints by jointly optimizing beamforming and time allocation. The utility functions of interest are nonconcave and the involved constraints are nonconvex, so these problems are computationally troublesome. To address them, path-following algorithms are proposed to arrive at least at local optima. The proposed algorithms iteratively improve the objectives with convergence guaranteed. Simulation results demonstrate that they achieve rapid convergence and outperform conventional solutions.