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

Hanyu Cao; Meiying Zhang; Huanxi Cai; Wei Gong; Min Su; Bin Li

doi:10.3934/jimo.2019086

Article Contents

2020, Volume 16, Issue 6: 2913-2922. Doi: 10.3934/jimo.2019086

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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
^* Corresponding author: Bin Li

Received: October 31, 2018

Revised: February 28, 2019

Early access: July 2019

Published: October 2020

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)

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Abstract

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.

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Mathematics Subject Classification: Primary: 90C90 Secondary: 49M37.

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Figure 1. Sum Rate versus $ P $

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Figure 2. Sum Rate versus $ P $

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Figure 3. Sum Rate versus $ P $

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