Linear Precoder Design for SWIPT in MIMO Broadcasting Systems With Discrete Input Signals: Manifold Optimization Approach

• Published in: IEEE transactions on communications Vol. 65; no. 7; pp. 2877 - 2888
• Main Authors: An-An Lu, Xiqi Gao, Zheng, Yahong Rosa, Chengshan Xiao
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.07.2017; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Broadcasting; Communication channels; Computer simulation; discrete input signals; Erbium; manifold optimization; Manifolds; MIMO; MIMO (control systems); multi-input multi-output (MIMO); Mutual information; Optimization; Power transfer; precoder design; Receivers; Simultaneously wireless information and power transfer (SWIPT); Time sharing; Transmitters
• ISSN: 0090-6778; 1558-0857
• DOI: 10.1109/TCOMM.2017.2695598

In this paper, we investigate the design of linear precoders for simultaneously wireless information and power transfer (SWIPT) in a multi-input multi-output (MIMO) broadcasting system with discrete input signals. The considered system model consists of one base station (BS), one information receiver (IR), and one energy receiver (ER). The design objective is to maximize the input-output mutual information of the IR subject to the power constraint and the harvested energy requirement for the ER. We derive the structure of the optimal linear precoder by using manifold optimization, and propose an algorithm to find the optimal precoder. Simulation results show that the proposed algorithm can achieve better performance than the time sharing scheme and the Gaussian optimal precoder when Gaussian inputs are replaced by discrete input signals.