Abstract
This paper analyzes the performance of the full-duplex (FD) multiple-input-multiple-output (MIMO) decode-and-forward (DF) relay system in the presence of self-energy recycling (S-ER). Specifically, this work proposes an antenna allocation scheme for S-ER as well as analytically evaluates the performance of this proposed scheme in terms of spectral efficiency (SE), energy efficiency (EE), outage and symbol error rate (SER). Since, the self-interference (SI) is a major bottleneck in achieving the true potentials of FD communication, this work considers SI as an energy harvesting opportunity to enhance the EE of the system. The proposed analysis shows that reserving few antennas for S-ER at the FD-MIMO relay improves the EE, however, it reduces the antenna array gain at the relay for information transmission and reception. Thus, a slight degradation in the SE, outage and SER is observed. Further, an adaptive S-ER technique has been proposed which utilizes the antennas corresponding to the least channel gain with respect to information transmission and reception for S-ER. This adaptive S-ER technique improves the EE and also compensates for the slight degradation in the SE, outage and SER through adaptive antenna allocation. Closed-form expressions for the SE, EE, outage and symbol error rate have been derived for these S-ER techniques. In the end, simulations results are provided to validate the efficacy of the theoretical derivations.
Highlights
T HE tremendous growth and ubiquitous access to wireless services have lead to a manifold increase in the mobile broadband data traffic volume over the last couple of decades [1]
MOTIVATION AND CONTRIBUTIONS Inspired by the current research in harnessing self-energy recycling (S-ER), in this paper, we investigate the impact of S-ER on the performance of a FD-MIMO-DF relay system
At PT = 20 dB, the average SE (ASE) of source-to-FD relay link is 9 bps/Hz, whereas for the FD relay-to-destination link ASE is 10 bps/Hz and the source-to-destination link is 9 bps. This is due to the fact that the source-to-FD relay link is impacted by the SI, and the FD relay-to-destination link is free from interference
Summary
T HE tremendous growth and ubiquitous access to wireless services have lead to a manifold increase in the mobile broadband data traffic volume over the last couple of decades [1]. In [31], authors have proposed an optimal power allocation scheme for maximizing the capacity of a AF based FD relay system under the impact of RSI. In [40], authors studied the performance of wireless powered dual-hop AF relaying systems and the impact of channel state information and antenna correlations on system performance. The proposed scenario suits well for a typical wireless cellular architecture, wherein the multi-antenna base station (BS) works as a relay facilitating the exchange of information among the user equipments (UEs). It has been shown that allocating more antennas for S-ER increases the EE by contributing more towards EH and reduced circuit power consumption This reduces the antenna array gain, which adversely impacts the SE, outage and SER performance of the system. Closed-form expressions of SE, EE, outage probability and SER has been derived for the FD-MIMO-DF relay system for both fixed and the adaptive S-ER schemes
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