Research On Power Allocation And Interference Management Of NOMA System For D2D Users

At present,we are in an era of rapid development of the Internet and the Internet of Things.In this context,in addition to meeting the ultra-high-speed transmission requirements,the next-generation communication network needs to cope with the large-scale popularization from networked devices and in different application scenario.The increasing network requirements of users pose more challenges to existing communication networks.In response to a series of problems that may arise in existing and future network communications,we explored solutions in the following areas.The first one is how to reduce the burden on the existing base station,that is,to reduce the burden of wireless communication undertaken by the communication base station through other communication channels.Currently,the research and application of the femtocell and D2D communication are widely used.Then,through certain technical means,the spectrum utilization efficiency of the existing cellular communication system is improved,and the capacity of the existing communication network is increased.The research focuses on the non-orthogonal multiple access technology.Finally,how to avoid the inter-user interference in the existing communication environment and improve the privacy security of communication system users are two main questions in D2D communications.Our research focus in this paper is to establish an efficient resource allocation strategy in the process of building a communication system model.And detailed analysis of the user power control scheme was carried on.The core of my work in this paper is also based on the above aspects of in-depth research and exploration.In the next generation of mobile communication networks,the main work direction of my research,namely D2D communication network and NOMA communication technology,has been researched,focusing on research.How to use NOMA technology to complete the construction of the network system model of communication,the impact of user pairing mode on the performance of communication system in NOMA communication,and the algorithm used by NOMA system in different pairing modes.Then the system model of D2D communication system is integrated into the cellular communication network,and the corresponding problem planning is carried out for the model.We mainly focused on improving the system throughput and suppressing the interference between users in the system under the model,among which several performances better and apply a wide range of resource allocation algorithms,such as game algorithms,best algorithms.These algorithms are used to simulate the system,and the system performance parameters are obtained.A new double-quench algorithm is proposed for the better performance of the best algorithm.Finally,after in-depth study of these two technologies,we designed a D2D communication scheme that can accommodate the NOMA technology model,namely the NOMA communication technology strategy for D2D users,and established a system communication model in which D2D and NOMA are integrated.In this model,the concept of user cluster is proposed to simulate the corresponding concept in NOMA technology.The improved double-quench algorithm proposed in the third chapter is used to simulate.The final result also shows that the algorithm reduces the complexity of the algorithm.The increase in the number of D2D user clusters allowed to access the communication system under the same conditions is greatly increased,and the system performance exhibits better stability.