中国邮电高校学报(英文) ›› 2018, Vol. 25 ›› Issue (4): 12-18.doi: 10.19682/j.cnki.1005-8885.2018.1012

• Wireless • 上一篇    下一篇

Antenna selection and forwarding strategy in SWIPT relay channels

Lei Weijia, Li Qin   

  1. 1. School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
    2. Chongqing Key Lab of Mobile Communication Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
  • 收稿日期:2017-12-07 修回日期:2018-08-16 出版日期:2018-08-30 发布日期:2018-11-02
  • 通讯作者: Li Qin,E-mail:liqin_young@qq.com E-mail:liqin_young@qq.com
  • 作者简介:Li Qin,E-mail:liqin_young@qq.com
  • 基金资助:
    This work was supported by the National Nature Science Foundation of China(61471076), the Science Research Project of Chongqing Education Committee (KJ1600413), Chongqing Research Program of Basic Research and Frontier Exploration (cstc2018jcyjAX0432), Program for Changjiang Scholars and Innovative Research Team in University ( IRT1299) and the special fund of Chongqing key laboratory (CSTC).

Antenna selection and forwarding strategy in SWIPT relay channels

Lei Weijia, Li Qin   

  1. 1. School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
    2. Chongqing Key Lab of Mobile Communication Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
  • Received:2017-12-07 Revised:2018-08-16 Online:2018-08-30 Published:2018-11-02
  • Contact: Li Qin,E-mail:liqin_young@qq.com E-mail:liqin_young@qq.com
  • About author:Li Qin,E-mail:liqin_young@qq.com
  • Supported by:
    This work was supported by the National Nature Science Foundation of China(61471076), the Science Research Project of Chongqing Education Committee (KJ1600413), Chongqing Research Program of Basic Research and Frontier Exploration (cstc2018jcyjAX0432), Program for Changjiang Scholars and Innovative Research Team in University ( IRT1299) and the special fund of Chongqing key laboratory (CSTC).

摘要: This letter proposes a low-complexity ‘harvest-and-forward’ relay strategy in simultaneous wireless information and power transfer (SWIPT) relay channels. In the first phase of relay transmission, the relay’s antennas are divided into two subsets. The signals received by the antennas in one subset are converted to energy, and the signals received by the antennas in the other subset are combined. In the second phase, the relay forwards the combined signal using all antennas with the harvested energy. A low complexity antenna selection (AS) algorithm is given to maximize the achievable rate over fading channels. The simulation results show that the achievable rate of this strategy is close to that of the two-stage strategy where a two-state procedure is proposed to determine the optimal ratio of received signal power split for energy harvesting, and the optimized antenna set engaged in information forwarding. The proposed strategy has better performance than the two-stage strategy when the relay is equipped with medium-scale antennas, and the performance gap between two strategies grows with the increase of the number of the relay’s antennas. The computational complexity of the proposed strategy is O(N2) (N is the number of relay antennas), which is obviously lower than that of the two-stage strategy (O(3N3)).

关键词: AS, SWIPT, energy harvesting (EH), relay

Abstract: This letter proposes a low-complexity ‘harvest-and-forward’ relay strategy in simultaneous wireless information and power transfer (SWIPT) relay channels. In the first phase of relay transmission, the relay’s antennas are divided into two subsets. The signals received by the antennas in one subset are converted to energy, and the signals received by the antennas in the other subset are combined. In the second phase, the relay forwards the combined signal using all antennas with the harvested energy. A low complexity antenna selection (AS) algorithm is given to maximize the achievable rate over fading channels. The simulation results show that the achievable rate of this strategy is close to that of the two-stage strategy where a two-state procedure is proposed to determine the optimal ratio of received signal power split for energy harvesting, and the optimized antenna set engaged in information forwarding. The proposed strategy has better performance than the two-stage strategy when the relay is equipped with medium-scale antennas, and the performance gap between two strategies grows with the increase of the number of the relay’s antennas. The computational complexity of the proposed strategy is O(N2) (N is the number of relay antennas), which is obviously lower than that of the two-stage strategy (O(3N3)).

Key words: AS, SWIPT, energy harvesting (EH), relay

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