This paper investigates the opportunistic sharing of relay for the proposed Non-Orthogonal Multiple Access (NOMA) assisted Cognitive Radio Networks (CRNs). The proposed scheme consists of a base station that communicates the superimposed composite signal to Primary Equipment (PEs) as well as Secondary Equipment (SEs) with/without a relay. This scheme is opportunistically investigated with both Decode-and-Forward (DF) and Amplify-and-Forward (AF) techniques. A cooperative network is formed with a relay to exploit the potential of spectral diversity offered by NOMA. A cooperative-NOMA furnishes significant performance over the non-cooperative NOMA as well as conventional multiple access in the proposed scheme for CRNs. The simulation results reveal that the superior outage probabilities of PEs and SEs under DF and AF techniques for the proposed scheme. The simulation analyses also authenticate that the DF technique provides outstanding outage performance compared to AF technique.

本文研究了拟议的非正交多址（NOMA）辅助认知无线电网络（CRN）的中继机会共享。所提出的方案包括一个基站，该基站通过/不通过中继将叠加的复合信号传送到主要设备（PE）和次要设备（SE）。使用解码转发（DF）和放大转发（AF）技术对这种方案进行了机会研究。与中继一起形成协作网络，以利用NOMA提供的频谱分集潜力。在提议的CRN方案中，协作式NOMA优于非协作式NOMA和常规的多址访问。仿真结果表明，该方案在DF和AF技术下具有较高的PE和SE中断概率。仿真分析还证明，与AF技术相比，DF技术提供了出色的停机性能。