Non-Linear Energy Harvesting Based Cooperative Spectrum Sharing Networks

In this paper, we investigate the performance of a non-linear energy harvesting based overlay spectrum sharing system. Herein, an energy-constrained secondary node acts as a cooperative relay to assist the transmission of primary user. In return for the benign cooperation, the secondary node enjoys the access to primary user's spectrum for its own information transfer. Specifically, the secondary node first harvests the energy from the received radio-frequency signal of primary transmitter during a dedicated energy harvesting phase. In the subsequent information transfer phase, secondary node splits the harvested power to forward the primary data as well as its own information intended for another secondary user. For this analytical framework, we derive the expressions of outage probability for both primary and secondary networks. Numerical and simulation results are obtained to extract various useful insights and to validate our theoretical developments.