Impacts of Nonlinear Energy Harvesting and Residual Self-Interference on the Performance of Full-Duplex Decode-and-Forward Relay System

Abstract

In this paper, we investigate the usage of a nonlinear energy harvester at a full-duplex (FD) relay, which can harvest the energy from radio frequency (RF) signals transmitted from the source. We mathematically derive the exact closed-form expressions of outage probability (OP), throughput, and average symbol error rate (ASER) of the nonlinear energy harvester-wireless information and power transfer-FD relaying (N-WIPT-FDR) system over Rayleigh fading channels. Unlike linear energy harvester, nonlinear energy harvester results in more computational complexity. Furthermore, it makes the outage floor happen faster even when self-interference cancellation (SIC) techniques are effectively applied due to the saturation power threshold of the nonlinear energy harvester. The combination of nonlinear energy harvester characteristic and residual self-interference (RSI) has significant impacts on the OP, throughput, and ASER of the considered N-WIPT-FDR system. On the other hand, there is an optimal energy harvesting (EH) time duration, which minimizes the OP. This optimal value depends on the transmission power of the source and the saturation power threshold of the nonlinear energy harvester. Monte-Carlo simulations are conducted to validate the derived mathematical expressions.INDEX TERMS Nonlinear energy harvesting, full-duplex relay, self-interference cancellation, decode-andforward, outage probability, throughput, average symbol error rate.

Performance analysis of energy harvesting‐enabled relay networks in κ‐μ fading channels

“…3,4 Additionally, EH technology has the capability to supply ample energy and prolong the energy lifespan of intermediate relay nodes in cooperative communications. 5 Cooperative communication employs two popular relaying protocols, namely amplify and forward (AF) and decode and forward (DF). Among these, AF is favored due to its simplicity and its ability to extend the battery life of the relays.…”

SNR Threshold-Based Relay Association and Random Phase Rotation for Cooperative Communication

“…Because the full-duplex RN receives and transmits signals using the shared time and channel, it can provide higher spectral efficiency; however, the enormous gap between the retransmitted and received signals causes a critical issue, namely, severe self-interference in the full-duplex RN. To resolve this issue, many self-interference-mitigation methods have been studied [21], [25], [26], [31], [32]. By contrast, because there is no self-interference between retransmitted and received signals at the half-duplex RN, it can be readily implemented and has been actively studied [1], [13], [16], [18]- [20], [22], [24], [27], [28].…”

On the performance of energy harvesting‐assisted Nth best relay cooperative networks in Nakagami‐m fading

“…1,2 Moreover, the EH technology can provide sufficient energy and also extends the energy's lifetime of intermediate relay nodes in cooperative communications. 3 In cooperative communication, two of the most popular relaying protocols are amplify and forward (AF) and decode and forward (DF) wherein AF is preferable due to its least complexity among others and having the capability to provide better battery life to the relays. [4][5][6] The combination of multiple relays using diverse strategies, such as selection combining (SC) and maximal ratio combining (MRC), allows for the appropriate fusion of signals from both the relayed and direct paths at the destination.…”

“…Energy harvesting (EH)‐assisted cooperative communication is considered as a lucrative key to increase the reliability and effective transmission rates and to extend the network coverage in fifth‐generation (5G) and beyond networks 1,2 . Moreover, the EH technology can provide sufficient energy and also extends the energy's lifetime of intermediate relay nodes in cooperative communications 3 . In cooperative communication, two of the most popular relaying protocols are amplify and forward (AF) and decode and forward (DF) wherein AF is preferable due to its least complexity among others and having the capability to provide better battery life to the relays 4–6 .…”