Research On Performance Of Random Distributed Cooperative Diversity System

With the development of wireless communication technology, people put forward on the higher requirements of quality and performance of wireless communication. In order to meet the growing demand, many new communication technology and mode is put forward in recent years, and the cooperative technology is one of them. In cooperative communication technology, the wireless channel are susceptible to noise, interference and other factors, making the received signals easy to produce distortion and one of the effective ways to reduce the decline effect is diversity with the fading signals. In cooperative diversity communication network, the transmission performance of each node is becoming a hot spot and one of the most important index is interrupt performance.Due to multi-hop DF cooperative diversity system can not get full space diversity, and the overall network will interrupt if the relay can not decode the signal from the source node correctly. In order to improve the transmission performance of system, the model of multi-hop SDF cooperative diversity system is built, its interrupt probability expression is deduced under the condition of high signal-to noise ratio, and finally make the simulation analysis on the probability expressions.Theoretical analysis and simulation results show that multi-hop SDF cooperative diversity system can effectively improve the transmission performance but the burden of the source node is heavy, and the study is based on the fixed network topology structure, that is the parameters of all nodes are fixed. However, the communication terminals are moving, their location parameters are dynamic in wireless communication environment. The random distribution multi-hop SDF cooperative diversity system is built for the simulation that the communication terminals are moving. The transmission performance of the model is studied and its outage performance approximate expression is derived under the condition of high SNR. Theory and simulation show that the performance of two-hop random distribution SDF cooperative diversity system can be improved with the increase of relay selection area coverage radius and the system performance also has a close relationship with the power allocation scheme between the source node and the relay node.