Joint Transceiver Optimization for MISO SWIPT Systems with Time Switching

Hoon Lee, Kyoung Jae Lee, Hanjin Kim, Inkyu Lee

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    52 Citations (Scopus)

    Abstract

    This paper considers multiple-input single-output simultaneous wireless information and power transfer (SWIPT) broadcast channels (BCs) where a multi-antenna transmitter serves single antenna receivers each equipped with a time switching (TS) circuit for information decoding (ID) and energy harvesting (EH). To be specific, we study a scheme which jointly determines the time durations allocated for the ID and the EH modes at each receiver and the transmit covariance matrices at the transmitter. Then, we present a general joint TS protocol for the SWIPT BC which includes conventional TS schemes as special cases. In order to fully characterize the performance of the proposed joint TS systems, the achievable rate region is analyzed under EH constraint at the receivers. By applying the rate profile methods, we identify the optimal TS ratios and the optimal transmit covariance matrices which achieve the boundary points of the rate region. Then, the boundary points are obtained by solving the average transmit power minimization problems with individual rate constraints at the receivers. To solve these non-convex problems, the original problems are decoupled into subproblems with fixed auxiliary variables. Then, the globally optimal TS ratios and the transmit covariance matrices are computed by finding the optimal auxiliary variables via convex optimization techniques. Numerical results demonstrate that the proposed joint TS scheme outperforms conventional TS methods.

    Original languageEnglish
    Pages (from-to)3298-3312
    Number of pages15
    JournalIEEE Transactions on Wireless Communications
    Volume17
    Issue number5
    DOIs
    Publication statusPublished - 2018 May

    Bibliographical note

    Funding Information:
    Manuscript received June 13, 2017; revised October 12, 2017 and December 27, 2017; accepted February 20, 2018. Date of publication March 5, 2018; date of current version May 8, 2018. This work was supported in part by the National Research Foundation through the Ministry of Science, ICT, and Future Planning, Korean Government, under Grant 2017R1A2B3012316. The work of K.-J. Lee was supported by the Korea Evaluation Institute of Industrial Technology Grant through the Korea Government, MOTIE (Development of Non-Binding Multimodal Wireless Power Transfer Technology for Wearable Device) under Grant 10079984. This paper will be presented in part at the IEEE ICC, Kansas City, MO, USA, May 2018 [1]. The associate editor coordinating the review of this paper and approving it for publication was L. Le. (Corresponding author: Inkyu Lee.) H. Lee, H. Kim, and I. Lee are with the School of Electrical Engineering, Korea University, Seoul 02841, South Korea (e-mail: [email protected]; [email protected]; [email protected]).

    Publisher Copyright:
    © 2002-2012 IEEE.

    Keywords

    • Wireless power transfer
    • multiple antenna techniques
    • simultaneous wireless information and power transfer (SWIPT)
    • time switching (TS)

    ASJC Scopus subject areas

    • Computer Science Applications
    • Electrical and Electronic Engineering
    • Applied Mathematics

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