Performance Analysis of Energy Harvesting-Based Relay-Assisted CR Network Under Co-channel Interference Environment

In wireless radio frequency (RF) networks, efficient spectrum utilization is a promising technique. Energy harvesting (EH) from wireless environment is also very challenging issue. In this paper, a performance analysis of multi relay-based CR network has been proposed in presence of co-channel interference (CCI) environment. Here, the secondary nodes in the form of corresponding secondary transmitter (SU-Tx) along with secondary relay (SR) modules can harvest energy from the primary transmitter as well as CCI. In our model, a strategic yet adaptable relay protocol is defined as adaptive hybrid relay (AHR) mode, and this reflects a switching between amplification forward (AF) or decode forward (DF) mode of operation depending on the successfully decoding activities of relays. Successful decoding of relays occurs when the SINR of an individual relay exceeds a threshold SINR value. Considering energy harvesting conditions, the power control policies at specific transmitter nodes, i.e., (SU-Tx) and (SR), are taken care of in a suitable manner. We investigate the outage performance for secondary receiver and develop a closed-form mathematical equation for the proposed system model. An AF and DF mode have been compared with our proposed AHR model in terms of secondary outage probability. Here, we discuss the effect of numbers of relay, energy harvesting efficiency factor, and decoding threshold SINR on secondary outage probability. Finally, Monte-Carlo simulations have been used to validate all of the analytical closed-form equations.