Abstract
In this article, we consider a dual-hop full-duplex (FD), amplify-and-forward, orthogonal frequency division multiplexing (OFDM) relaying network, where the relay operates based on a time-switching architecture to harvest energy from radio frequency signals. We use a polarization-enabled digital self-interference cancellation (PDC) scheme to cancel the self-interference signal at the relay in order to achieve FD communications. The paper provides a comprehensive analysis of the system performances in terms of outage probability and throughput over multipath Rayleigh fading channels. Furthermore, the optimal time split between the duration of energy harvesting and signal transmission to maximize the system throughput is numerically calculated. We also derive the asymptotic lines to simplify the expressions of outage probability and throughput at high transmit signal-to-noise ratios (SNR). Our analysis and simulation results show that the proposed FD relaying system by utilizing a proper time split fraction can boost the system throughput significantly over an appreciable range of transmitting SNR values, compared to half-duplex (HD) relaying systems.
Highlights
The conventional energy-constrained wireless networks, such as wireless sensor networks, have a limited lifetime
The optimal α is numerically obtained, which results in the maximum system throughput
The outage probability in the simulation is calculated as the number of times when the instantaneous signal-to-noise ratios (SNR) of a sub-carrier is smaller than the threshold SNR γth divided dRAF (α) dα
Summary
The conventional energy-constrained wireless networks, such as wireless sensor networks, have a limited lifetime. For the energy-limited sensors, recharging or replacing batteries is periodically performed to sustain network operations, which is costly, time-consuming, and sometimes infeasible due to some physical limitations, such as hazardous environments. Wireless energy harvesting (EH) techniques provide a solution to realize the long-term operation of the sensors in this kind of scenario. Some preliminary works [1]–[3] rely on natural energy sources, such as solar, wind, and thermoelectric effects to provide EH. These sources cannot be controlled and the harvesting requires peripheral EH equipment. In [4], the authors consider a system with a single transmit antenna
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