Research On SWIPT And NOMA Technology In Cooperative Communication Networks

Cooperative communication technology can effectively improve the transmission performance and coverage of wireless communication networks,and has been widely studied and applied in various communication networks.In recent years,traditional cooperative communication networks have faced new challenges in order to meet the wireless access needs of a large number of Io T devices,especially the energy consumption of communication nodes and the use of time and frequency resources.To solve these problems,Simultaneous Wireless Information and Power Transfer(SWIPT)an d Non-orthogonal Multiple Access(NOMA)technologies have been introduced in cooperative communication networks.This has become a hot research topic.In complex multi-relay multi-user cooperative communication networks using SWIPT technology,the radio link selection strategy has a direct impact on the network transmission performance and system implementation complexity,and therefore needs to be studied in depth.In addition,for cooperative communication networks using NOMA technology,the network transmission performance and the impact of user interference on the performance also need to be further analysed.To address these two issues,we first investigate the SWIPT technique in cooperative communication networks and propose a link selection algorithm that takes into account the system performance and complexity.Then,the NOMA technique in cooperative communication networks is studied to deeply analyze and optimize the impact of self-interference on the system.The work and innovations of this paper c an be summarized as follows:(1)A low-complexity link selection strategy is designed for a multi-relay multi-user complex cooperative network using SWIPT technology,and the exact and approximate values of the network outage probability are derived theoretically.Simulation experiments verify the correctness of the theoretical analysis,and the simulation results show that the proposed scheme significantly reduces the complexity of the system implementation compared to existing schemes while ensuring network outage performance.In addition,the impact of link selection strategy in terms of the judgment threshold and SWIPT optimal power allocation factor parameters on the network transmission performance is further investigated.(2)For a Full Duplex(FD)cooperative network using Power-Domain Non-Orthogonal Multiple Access(PD-NOMA)technology,the impact of user FD loop interference on transmission performance is considered,and theoretical solutions are derived for the network outage probability,diversity gain and The closed-form solutions for network outage probability,diversity gain and throughput are derived theoretically.Simulation experiments verify the correctness of the theoretical analysis,and the simulation results show that the proposed joint NOMA and FD cooperative communication scheme has significantly improved the transmission performance compared to the traditional Orthogonal Multiple Access(OMA)and Half Duplex(HD)schemes.