Impartial SWIPT-Assisted User Cooperation Schemes

Abstract

In this paper, we propose an impartial simultaneous wireless information and power transfer (SWIPT)assisted cooperation mechanism for a non-orthogonal multiple access (NOMA) downlink scenario.Specifically, both a cell-center user and a cell-edge user apply the power-splitting technique and utilize the harvested energy to forward the other user's information on the premise of successful decoding of their own information. Both analytical and numerical results show that the proposed impartial user cooperation mechanism (IUCM) outperforms the traditional partial cooperation mechanism in terms of outage probability, diversity order and diversity-multiplexing trade-off (DMT). For comparison, we further incorporate the IUCM into an orthogonal frequency-division multiple access (OFDMA) framework, which is shown to preserve the same diversity order, while has a worse but more flexible DMT performance in comparison with the IUCM in the NOMA framework. Although the IUCM in OFDMA has a worse outage performance, it is proved that it has the same optimal system outage probability with the IUCM in NOMA when the relaying channel between the two users is error-free.

Performance Analysis and Optimization for Power Beacon-Assisted Wireless Powered Cooperative NOMA Systems

“…For SWIPT, the trade-off for rate and harvested energy for TS and PS protocols were investigated in [4] and [5], respectively. Moreover, performance analyses and optimization for its combination with cooperative relaying [6], cognitive radio [7], and distribution antenna systems [8] have also been studied deeply. For WPCN, the related works mainly include the applications into relaying network [9], [10], cognitive radio network [11], [12], cellular network [13] and unmanned aerial vehicle (UAV)assisted communication [14].…”