Interference-Aided Energy Harvesting: Cognitive Relaying With Multiple Primary Transceivers

Abstract

Abstract-We consider a spectrum sharing scenario where a secondary transmitter (ST) communicates with its destination via a decode-and-forward secondary relay (SR) in the presence of interference from multiple primary transmitters. The SR harvests energy from received radio-frequency signals that include primary interference and uses it to forward the information to the secondary destination. The relay adopts a time switching policy that switches between energy harvesting and information decoding over the time. Under the primary outage constraints and the peak power constraints at both ST and SR, to determine the average secondary throughput, we derive exact analytical expressions for the secondary outage probability and the ergodic capacity, which characterize the delay-limited and the delaytolerant transmissions, respectively. We also investigate the effects of the number of primary transceivers and the peak power constraints on the optimal energy harvesting time that maximizes the secondary throughput. By utilizing the primary interference as an energy source, the secondary network achieves a better throughput performance compared to the case where the primary interference is ignored for energy harvesting purpose. Finally, we consider a case where ST also harvests energy from primary transmissions and compare its throughput performance with that of the non-energy harvesting ST case.

A Survey of Energy and Spectrum Harvesting Technologies and Protocols for Next Generation Wireless Networks

“…Based on stochastic geometry, outage probability with and without relay-assisted transmission is derived, and selection of the optimum relay based on the comparisons of above-derived probabilities is made. In dominant interference and noise environments, a spectrum sharing scenario is considered in [179], where the SUs communicate via an interference-aided EH DF relaying with multiple primary transmissions and outage limitations. Relays use time-switching to shift between EH and data transfer.…”

“…Relay assisted CR for EH is proposed in [177], [178]. Interference-aided energy harvesting with decode-andforward relaying (DF) in CR is studied in [179]. SWIPT based EH and DF relay-based cooperative spectrum sharing is proposed in [180].…”

Simultaneous Wireless Information and Power Transfer for Dynamic Cooperative Spectrum Sharing Networks

“…Substituting (14) into (32), the outage probability of secondary user can be derived as (53) on the next page, where…”

“…Zhai et al [13] proposed an efficient RF-EH-based spectrum leasing scheme by selecting the best secondary transmitter to relay the primary data along with the primary transmitter using Alamouti coding. Kalamkar and Banerjee [14] investigated the performance of cognitive relay networks with energy harvesting relay, where the interferences from multiple primary transmitters were considered. Furthermore, a cognitive two-way relaying network, where the SWIPT-enabled relay helps two secondary nodes exchange information with the energy harvested from the received signals, was studied in [15].…”

Performance of Wireless Powered Cognitive Radio Sensor Networks With Nonlinear Energy Harvester

“…Specifically, the authors in [9] and [10] have considered an underlay CRN with RF energy harvesting and analyzed outage performance of the system. As an extension to the system in [9], [10], the authors in [11] have considered multiple primary nodes and derived expressions of the outage probability (OP) and ergodic capacity for the secondary system by considering interference from multiple PUs. Further, in [12], the authors have introduced one-way cooperative CRNs with SWIPT and analyzed the OP and throughput performance for the primary and secondary systems.…”