TY - JOUR
T1 - Energy Efficient SWIPT Systems in Multi-Cell MISO Networks
AU - Jang, Seokju
AU - Lee, Hoon
AU - Kang, Seowoo
AU - Oh, Taeseok
AU - Lee, Inkyu
N1 - Funding Information:
Manuscript received November 23, 2017; revised September 21, 2018; accepted September 26, 2018. Date of publication October 16, 2018; date of current version December 10, 2018. This work was supported by the National Research Foundation through the Ministry of Science, ICT, and Future Planning (MSIP), Korean Government, under Grant 2017R1A2B3012316. This paper was presented at the IEEE Vehicular Technology Conference 2018-Fall, Chicago, IL, USA, August 2018. The associate editor coordinating the review of this paper and approving it for publication was A. Bletsas. (Corresponding author: Inkyu Lee.) S. Jang, S. Kang, T. Oh, and I. Lee are with the School of Electrical Engineering, Korea University, Seoul 02841, South Korea (e-mail: seokju@ korea.ac.kr; kangsw1215@korea.ac.kr; jets00@korea.ac.kr; inkyu@korea. ac.kr).
Publisher Copyright:
© 2018 IEEE.
PY - 2018/12
Y1 - 2018/12
N2 - This paper studies beamforming design problems for multi-cell multi-user downlink networks with simultaneous wireless information and power transfer (SWIPT). In this system, multi-antenna base stations (BSs) concurrently transfer information and energy to multiple single-antenna information decoding (ID) and energy-harvesting (EH) users. We aim to maximize EH efficiency (EHE) that is defined as the ratio of the harvested energy at the EH users to the amount of energy consumption at the BSs while guaranteeing the quality-of-service constraint for each ID user. The EHE metric quantifies the efficiency of the power transfer capability of the SWIPT network. For the EH operation, both an ideal linear model and a practical non-linear model are individually investigated. We optimally solve this non-convex problem in two different scenarios according to the cooperation level among the BSs. First, for the centralized case, where global channel state information (CSI) is available at all BSs, we propose a centralized beamforming method based on the semi-definite relaxation and the successive convex approximation techniques. Next, in order to reduce the backhaul signaling overhead, decentralized algorithms are presented where each BS computes its beamforming vector by only using local CSI. The simulation results show that the proposed SWIPT beamforming algorithms offer a significant EHE performance gain over conventional schemes.
AB - This paper studies beamforming design problems for multi-cell multi-user downlink networks with simultaneous wireless information and power transfer (SWIPT). In this system, multi-antenna base stations (BSs) concurrently transfer information and energy to multiple single-antenna information decoding (ID) and energy-harvesting (EH) users. We aim to maximize EH efficiency (EHE) that is defined as the ratio of the harvested energy at the EH users to the amount of energy consumption at the BSs while guaranteeing the quality-of-service constraint for each ID user. The EHE metric quantifies the efficiency of the power transfer capability of the SWIPT network. For the EH operation, both an ideal linear model and a practical non-linear model are individually investigated. We optimally solve this non-convex problem in two different scenarios according to the cooperation level among the BSs. First, for the centralized case, where global channel state information (CSI) is available at all BSs, we propose a centralized beamforming method based on the semi-definite relaxation and the successive convex approximation techniques. Next, in order to reduce the backhaul signaling overhead, decentralized algorithms are presented where each BS computes its beamforming vector by only using local CSI. The simulation results show that the proposed SWIPT beamforming algorithms offer a significant EHE performance gain over conventional schemes.
KW - Energy efficiency
KW - multi-cell coordination
KW - simultaneous wireless information and power transfer (SWIPT)
UR - http://www.scopus.com/inward/record.url?scp=85055018107&partnerID=8YFLogxK
U2 - 10.1109/TWC.2018.2874646
DO - 10.1109/TWC.2018.2874646
M3 - Article
AN - SCOPUS:85055018107
VL - 17
SP - 8180
EP - 8194
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
SN - 1536-1276
IS - 12
M1 - 8493519
ER -