Research On The Performance Of The Physical Network Coding Cooprative Communication System

Cooperative communication system and physical layer system networkcoding in recent years become the focus of research in the communication scopebecause they can improve the efficiency and the volume. Cooperativecommunication develops from the relay communication, it change the relay nodeto the user node, in form the effect of virtual MIMO; In the wireless network, theelectromagnetic wave has the special broadcasting characteristics, all nodes couldrecieve all the other nodes’ information, the PNC uses the property to process andsend information in cooperative node, to attain the expecting results of reducingthe communication network time and increasing the network throughput. Sincethe two technologies can improve the communication system’s performance, thispaper focuses on the PNC applied in the cooperation communication system.Firstly, this paper researchs deeply on the basic principle of cooperativecommunication and the cooperative ways, analyze and compare the difference ofthe ways; then introduces the basic principle of the physical network coding andmapping scheme.Secondly, the paper use the PNC in the three models of the traditionalcooperation communication system, analyze the performance of all schemes,conclude the PLNC scheme has an advantage in interrupt probability， thediversity gain and throughput than the traditional schemes.Lastly, to improve the sysytem’s spectral efficiency and reduce the sysytem’sbit error rate, this paper put forward the improved algorithm of opportunistic relayand denoise mapping, it analysis from the theory to prove the improved algorithmcan achieve orignal purpose, and simulate schemes’ the spectral efficiency and thebit error rate in the Matlab simulation platform, verify the theory is correct.