TY - JOUR
T1 - Joint Transceiver Optimization for MISO SWIPT Systems with Time Switching
AU - Lee, Hoon
AU - Lee, Kyoung Jae
AU - Kim, Hanjin
AU - Lee, Inkyu
N1 - 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: ihun1@korea.ac.kr; hanjin8612@korea.ac.kr; inkyu@korea.ac.kr).
Publisher Copyright:
© 2002-2012 IEEE.
PY - 2018/5
Y1 - 2018/5
N2 - 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.
AB - 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.
KW - Wireless power transfer
KW - multiple antenna techniques
KW - simultaneous wireless information and power transfer (SWIPT)
KW - time switching (TS)
UR - http://www.scopus.com/inward/record.url?scp=85042878446&partnerID=8YFLogxK
U2 - 10.1109/TWC.2018.2809734
DO - 10.1109/TWC.2018.2809734
M3 - Article
AN - SCOPUS:85042878446
SN - 1536-1276
VL - 17
SP - 3298
EP - 3312
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
IS - 5
ER -