Research On The Network Coding And Cooperative Communication Systems

Cooperative diversity is an efficient method to suppress multipath fading in wirelesssystem and improve transmission rate. Network coding is not only an effective solution totransport congestion but also an effective technology to improve network transmission, andreduce the outage probability of system. Cooperative communication system and thecombination of cooperative communication and network coding are researched in this paper.Firstly, the basic principles and key technologies of network coding, the principle andbasic protocol of collaborative communication are introduced.Secondly, by co-designing with network coding, channel coding and cooperativecommunication, this paper works out a network coding coordination communication systembased on convolution code, and establishes a system model. Meanwhile it studies decodingalgorithm of the program. In an additive white Gaussian noise channel, the bit error rate ofthese systems is simulated and analyzed.The results show that the BER performance of thesystem has been significantly improved.Finally, in order to further improve the collaboration diversity degrees, the paperproposes a cooperation improvement scheme based on relay users coding. It improves thediversity gain of the cooperative system to third-order by increasing diversity path. Formulti-user coding collaboration system, this paper also proposes a multi-user codingcollaboration scheme that different collaborative user forwarding of different checksum. Thispaper studies the interruption of the system probability, and optimizes the collaborationdegrees and power distribution of collaboration system. The simulation results show that theprogram is able to achieve higher order diversity in full collaboration, so as to further enhancethe collaboration performance.