Published Paper Details:

In this research, we suggest using non-orthogonal multiple access (NOMA) for the Internet of Things with cache-enabled coordinated direct and relay (CDRT) transmission (IoT). In order to maximise spectrum use and decrease power consumption, it employs time-switching (TS)-based SWIPT technology in conjunction with overlay cognitive radio (CR). The suggested architecture features a primary network with a primary transmitter and the specified receivers (UE1 and UE2), as well as a secondary network featuring an energy-constrained transmitter, its cache memory, and the receiver it is meant for (IoT-U). The primary transmitter has direct communication with the strong user equipment (UE)1, while the secondary transmitter acts as an Internet of Things (IoT) relay to reach the weak user equipment (UE)2. To relay both the weak user's and its own data, the IoT-transmit node employs a TS-based receiver architecture and a decode-and-forward protocol, in accordance with the NOMA principle. Data from the most frequently accessed files is also prefetched by the cache. Taking into consideration both perfect and imperfect consecutive interference cancellation at the legitimate users over Rayleigh fading channel fading, the proposed system's performance is tested in terms of outage probability, throughput, and energy efficiency. Further, we investigated the potential for primary and secondary networks to work together using a content caching technique to maximise spectrum use. The significance of the most influential criteria is also emphasised, providing a road map for the realistic development of cutting-edge wireless communication networks with minimal influence on either energy consumption or radio frequency bandwidth.