Research On Cooperative Communication System Based On Network Coding

In recent years, as the smart mobiles phone and tablet computers as well asMicro message OTT business becoming very popular among the users, which makepeople’s demand for transmission quality in wireless continues to increase, in themeanwhile, their requirement for network service are becoming more diversity. Inthis context, how to ensure the reliability and safety of transmission, while improvingthe utilization of the network communication resources, providing high-quality userexperience and improving the performance of network transmission, has become oneof the important topics of current research in the field of wireless networkcommunication. Among them, the cooperative diversity technique has beencommonly used in the third generation mobile communication, it can combat wirelesschannel fading well. is a powerful technique with relatively low investment inwireless communication that can greatly improve the performance of wirelessnetwork. Network coding is a hot research in the field of communications in recentyears, it combines the ideas of coding and routing, if using appropriate codingtechniques, network transmission can achieve the maximum flow limit. In this paper,we study the performance of the combination of network coding and cooperativecommunication, and use the corresponding channel model to simulation and analysisits performance.The author’s main work is as follows:1. Introduced the diversity and combination of technology, giving the basicmodel of cooperative communication, including amplify and forward (AF), decodeand forward (DF) and coded cooperation (CC) mode. Also use simulation to analyzethe system performance under various of modes. Introduces the basic concept andprinciple of network coding, including the structure of network coding and itsapplication in various fields, also analyzes the advantage of network coding.2. Through the analysis of the existing network coding cooperativecommunication system, proposed an adaptive cooperative coding communicationmodel based on DF protocol. Analysis the communication process of the system model, and gives the theoretical system outage probability performance, finallythrough the comparison and simulation to verify the performance of the system model,The simulation results show: compared with the ARQ collaboration retransmissionmode, the system performance is improved obviously.3. As the situation of relay selection failure may occur due to competitioncollisions, proposes a collaborative coding communication model based on relay’s biterror rate. The relay node of this model determine the forwarding strategy accordingto the situation of the received signal, which can select the node of good channelcondition and avoid the collision, and more relays participating in cooperationimprove the system’s diversity, the channel capacity is also has the very bigpromotion. Finally, through the simulation to verify the system performance of thescheme, the simulation results show: compared to the opportunistic relay scheme, thegain of system is better.