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doi: 10.3934/jimo.2019086

## A zero-forcing beamforming based time switching protocol for wireless powered internet of things system

 1 College of Electrical and Information Technology, Sichuan University, Chengdu, China 2 Key Laboratory of Wireless Power Transmission of Ministry of Education, Sichuan University, Chengdu, China

* Corresponding author: Bin Li

Received  November 2018 Revised  March 2019 Published  July 2019

Fund Project: This work was supported by a grant from National Natural Science Foundation of China under number 61701124, a grant from Science and Technology on Space Intelligent Control Laboratory, No.KGJZDSYS-2018-03, a grant from Sichuan Province Government under No.2019YJ0105, and a grant from Fundamental Research Funds for the Central Universities(China).

In this paper, a time switching (TS) protocol for the wireless powered communications system with per-antenna power constraints is considered. To eliminate the multi-user interference, we adopt the zero-forcing beamforming scheme to maximize the sum rate performance. A two-step algorithm is proposed to solve the sum rate maximization problem with per-antenna power constraints. More specifically, golden section search method is used to find optimal time switching factor in the first step. For each given TS factor, the sub-problem in the second step is convex, which can be efficiently solved by standard software package. Numerical results are provided to demonstrate the effectiveness of the proposed methods, and some interesting results are also observed.

Citation: Hanyu Cao, Meiying Zhang, Huanxi Cai, Wei Gong, Min Su, Bin Li. A zero-forcing beamforming based time switching protocol for wireless powered internet of things system. Journal of Industrial & Management Optimization, doi: 10.3934/jimo.2019086
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##### References:
Sum Rate versus $P$
Sum Rate versus $P$
Sum Rate versus $P$
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