Research On Wireless Cooperative Network Coding Technology

Wireless cooperative communication has oblivious advantages in mitigating multipath decline and increasing system transmission rate,meanwhile,obtaining diversity gains without increasing the cost of hardware,however,there are some disadvantages of low frequency of spectrum utilization which can be further made up for by introducing network coding into wireless cooperative communication system via reducing the timeslot of message transmission,therefore,network coding technology based on the wireless cooperative communication has became a hotspot issue in recent years.According to the above,this thesis makes an in-depth exploration and research on the network coding technology based on wireless cooperative communication.Major research efforts are following:(1)The thesis firstly proposes the joint node credibility,maximize signal-to-noise ratio and channel gain relay selection scheme under the condition of non-trust multiple cooperative relay in order to safeguard the security and effectiveness of communication system.The scheme increases the security of data transmission and resolves the problems of resources wastes brought by message retransmission caused by pollution and replay attacks,at the same time,the simulation results demonstrate that this scheme can significantly improve access to the destination and speed as well as reduce the outage probability of the system.(2)Secondly,the thesis on one hand puts forward the adaptive agreement system based on the mutual information forwarding to further enhance effectiveness of system through analyzing the transmission agreement of wireless collaborative network code in detail,including classical amplify-and-forward?decode-and-forward?XOR-MIF?SC-MIF compress and forward relay agreement,at the same time,simulates and analysis the symbol error rate.On the other hand,it raises a mutual message forward agreement according to channel state dynamic selection.The simulation results demonstrate that this scheme with better symbol error rate can significantly improve its access to the destination and speed as well as reduce the outage probability of the system.(3)In order to further to increase the security of system,the thesis presents the a low complexity secure network coding based on sparse matrix.The scheme builds a sparse matrix in terms of the diagonal structure criterions and makes matrix transformation on sourceinformation by take advantage of characteristics of sparse matrix,which makes the scheme got close to the probability of 1 to meet the security needs.In the mean time,theory analysis and simulation results show that security network coding improves the decoding speed and reduces its energy consumption.