Wireless information and power transfer in relay systems with multiple antennas and interference

Guangxu Zhu, Caijun Zhong, Himal A. Suraweera, George K. Karagiannidis, Zhaoyang Zhang, Theodoros A. Tsiftsis

Research output: Contribution to journalArticlepeer-review

139 Citations (Scopus)

Abstract

In this paper, an energy harvesting dual-hop relaying system without/with the presence of co-channel interference (CCI) is investigated. Specifically, the energy constrained multi-antenna relay node is powered by either the information signal of the source or via the signal receiving from both the source and interferer. In particular, we first study the outage probability and ergodic capacity of an interference free system, and then extend the analysis to an interfering environment. To exploit the benefit of multiple antennas, three different linear processing schemes are investigated, namely, 1) Maximum ratio combining/maximum ratio transmission (MRC/MRT), 2) Zero-forcing/MRT (ZF/MRT) and 3) Minimum mean-square error/MRT (MMSE/MRT). For all schemes, both the systems outage probability and ergodic capacity are studied, and the achievable diversity order is also presented. In addition, the optimal power splitting ratio minimizing the outage probability is characterized. Our results show that the implementation of multiple antennas increases the energy harvesting capability, hence, significantly improves the systems performance. Moreover, it is demonstrated that the CCI could be potentially exploited to substantially boost the performance, while the choice of a linear processing scheme plays a critical role in determining how much gain could be extracted from the CCI.

Original languageEnglish
Article number7029680
Pages (from-to)1400-1418
Number of pages19
JournalIEEE Transactions on Communications
Volume63
Issue number4
DOIs
Publication statusPublished - Apr 1 2015

Keywords

  • Dual-hop relay channel
  • co-channel interference
  • linear multiple-antenna processing
  • performance analysis
  • wireless power transfer

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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