Research On Cooperative Diversity In Relay Cellar Network

Transmission reliability and efficiency are two targets of the wireless communication system. Cooperative diversity technology can overcome the multipath fading and improve the effectiveness of system transmission. Network coding can improve the utilization rate of spectrum in wireless communication system. The combination of cooperative diversity and Network coding can improve the overall system performance dramatically.This article researches that how to apply the network coding theory in cooperative diversity technology to acquire the diversity gain and network-coding gain simultaneously. Firstly, we propose a network-coded cooperative diversity plan on uplink, whose core idea is to give the network coding function to relay node. We give out the concrete decoding method and analysis the interruption behavior. Simulation results shows that compared to traditional way, network-coded cooperative diversity technology uses less spectrum resources and acquires lower interruption probability in.high signal noise rate (SNR).Next, we propose a multi-relay network-coded cooperative diversity plan and an enhanced network-coded cooperative diversity plan. In the first plan, neighboring relays in the interleaved area make joint network coding with information. In the later plan, relays decide whether to communication coordinately and which forward mode will be used, network-coding forward, decoding forward or amplify forward. This plan combines the advantage of network coding and enhanced relay, which can improve the reliability and efficiency of wireless communication system.Lastly, we propose a handover plan based on network-coded cooperative diversity technology. In the new plan, we make best use of the advantages of network-coded cooperative diversity, and add more time slot resources to fulfill the handover process between sectors, so we can reduce the conflicts between system resource and performance.