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- Title
Utility-Based Optimal Precoding for SWIPT in MIMO Broadcasting Systems.
- Authors
Fang, Bing; Qian, Zuping; Shao, Wei; Zhong, Wei
- Abstract
In this paper, we focus on optimal precoding for simultaneous wireless information and power transfer in multiple-input multiple-output broadcasting systems. A utility function, which is a nonnegative weighted sum of the achievable data rate and the received energy, is designed to effectively allocate the available power. Then, the problem of optimal precoding is formulated as a utility maximization problem, and a closed-form solution is provided. In order to clearly illustrate the rate-utility tradeoff, a two-tier optimization structure is adopted, and the corresponding two-tier optimization algorithm, for which the outer-tier optimization is accomplished by the golden section search method, is also provided. Our results indicate that the maximum information transmission and the energy transfer must be well balanced in order to maximize the total payoff, and the method employed by this paper can obtain the unique precoding matrix for the optimal operating point.
- Subjects
MIMO systems; BROADCAST channels; TELECOMMUNICATION channels; WIRELESS power transmission; WIRELESS communications
- Publication
Wireless Personal Communications, 2016, Vol 87, Issue 3, p939
- ISSN
0929-6212
- Publication type
Article
- DOI
10.1007/s11277-015-3003-0