Optimal Performance Analysis And Improvement Research Of COPE Protocol Based On Network Coding

Since the concept of network coding was put forward,network coding has made great progress and has been extensively studied in the academic and industrial fields.The process of transmission in wireless network,the foreign scholars proposed an inter flow encoding based on network transmission network encoding protocol COPE,the protocol is mainly using wireless network characteristics,and the use of "listening "and" opportunistic listening"and" encoding,and moderate opportunism "get the neighbor node" state ",and" listen"packets to the destination node as a decoding operation basis.The transmission mode based on COPE can significantly improve the transmission efficiency of wireless mesh networks,greatly enhance the throughput of the network and further improve the transmission performance of the network.Therefore,it has attracted widespread attention of scholars.The research of this dissertation is protocol COPE based on network coding,which can effectively improve the throughput of wireless networks and maximize the transmission efficiency of wireless networks.This article is the research work and innovations are as follows:Firstly,on the basis of the research and analysis of COPE protocol,this paper transforms the coding of coded nodes into the idea of encoding architecture.The main research from single coding combination to double coding combination,and finally deduced to the general coding combination network environment.Two main factors that affect the performance of network coding are analyzed,including the scheduling order of the link and the priority of the link.It is pointed out that the maximum throughput of a single coded combination is related to the number of coded combinations and the number of nodes in the entire network.The maximum throughput of the whole network is obtained when the priority of the intermediate node is equal to that of the coded packet combination.At the same time,the size of the buffer is also an important factor.Secondly,in view of the problems existing in the COPE protocol,this paper proposes a CACM based on the COPE protocol.This architecture is an improvement to the COME-based network coding architecture.The main idea is that the coding process,The future of the need to obtain the data packets as a coding package conditions,but also the future may increase the number of coding opportunities for the same code as a coding condition,then the entire system throughput can be greatly improved,that is,the proposed " Opportunistic asynchronous transfer encoding CACM",that is,as much as possible to the original data packet encoding operation,and then the encoded data packets for transmission.The essence of the coding idea is to carry out the coding operation as much as possible,as much as possible to increase the neighbor nodes of the encoded data packets,so there are more opportunities to carry out coding operations.The experimental results show that the opportunistic asynchronous transmission coding CACM can further improve the throughput of the wireless network and improve the transmission efficiency of the network.At the same time,the buffer size is also a non-negligible factor.In the absence of a buffer,the performance of the wireless network coding will be degraded.The experiment also proves that the buffer size can increase the network coding and improve the network transmission throughput.