Relay Communication Scheme Research Based On Mixed Orthogonal Space-time Network Coding

In the context of information society,the wireless communication technology has been rapidly developed.The performance of the wireless system has played a vital role in the communication process.In order to improve the quality of the wireless communication system,many researchers have made outstanding contributions in various fields,including the space-time coding,network coding and cooperative relaying technique.In terms of space-time coding,when satisfying the orthogonal design criteria(i.e.the orthogonal space-time coding),the transmit diversity of the wireless system can be effectively improved.Meanwhile,the complexity of decoding is reduced.Secondly,network coding can further compresses the flow of information,thus the channel capacity can be improved.In the wireless cooperative communication system,the users not only send/receive their own data,but also act as a relay node and forward network data to other nodes,which can be regarded as an efficient communication solution.In this paper,from the above mentioned different aspects of several technical schemes as research context,the application of orthogonal space-time network coding in the relay communication is focused on aiming at improving system throughput and channel utilization issues in the condition of the limited spectrum resources.The main work is as follows:1)Several typical diversity and space-time coding techniques are expounded.The system model of the space-time coding is discussed,and the space-time block coding technology is focused on,including encoding and decoding principles.2)The model and scheme of cooperative relay are analyzed,and the network coding technology is used to the relay coordination model,in order to improve the system throughput and data transmission efficiency.3)An orthogonal space-time network coding relay communication scheme is proposed.This solution analyzes the signal interaction among relay node and nodes on the multiple access channel(Multi Address Channel,MAC)phase and broadcast channel(Broadcast Channel,BC)phase,and the better relay node was preferably selected according to the error probability of signal transmission.Later we make different simulation analysis in terms of network throughput and network power distribution.Compared with the TWR communication scheme and MWR communication solution,the proposed communication scheme has a better advantage on the improvement of network throughput and the utilization rate of channel.