Performance analysis of Cooperative underlay CRN in NOMA aided Energy harvesting for multiple secondary users

Abstract

This paper proposes a relaying scheme in an underlay cognitive radio network(CRN), where a source node desires to transmit the information simultaneously to more than two desired destinations. The power required for the relay operation is based on applying energy harvesting from the base station (BS). The proposed paper also includes Non-orthogonal multiple access (NOMA) with fixed power allocation to the different users to perform the decoding process irrespective of the channel condition. We have proposed a mathematical expression for the analysis of outage probability for the different users. In this respect, the linear model is discussed for perfect successive interference cancellation (SIC) at the receiver. Using the fixed power allocation process, we have simulated different output parameters such as Bit Error Rate (BER), NOMA capability, and the outage probability.

Outage and Error-Rate Analysis of NOMA-Inspired Multicarrier Underlay Cognitive Radio System

“…There are several significant contributions reported in the literature on NOMA-based CR systems. The concept of power-domain NOMA has found its application in CRNs both with relay [6]- [16] or without relay [17], [18] and in energy harvesting networks [8], [15]. In cognitive radio systems, NOMA has been employed in different modes of deployment like underlay mode [6]- [9], [11], [12], [15], overlay mode [13], [14] and hybrid modes [10], [17].…”

“…The concept of power-domain NOMA has found its application in CRNs both with relay [6]- [16] or without relay [17], [18] and in energy harvesting networks [8], [15]. In cognitive radio systems, NOMA has been employed in different modes of deployment like underlay mode [6]- [9], [11], [12], [15], overlay mode [13], [14] and hybrid modes [10], [17]. Flexible schemes of multiple access have also been proposed in the literature [10], [17]- [19] wherein the cognitive radio system is operated in hybrid mode i.e., using both OMA and NOMA depending upon the availability of the primary spectrum.…”

“…Mostly, power allocation schemes consider the interference constraint with respect to primary system, but do not ensure minimum throughput at PU. Performance of the cognitive radio system has been analysed with respect to outage probability considering perfect SIC in [15], [16] and considering imperfect SIC in [7], [8], [11], [13], [14], [27], [28], [29]. Error rate analysis of relay-based cognitive radio systems using NOMA is reported in [12] and [14], and that of noncognitive radio systems is considered in [25] and [30].…”