Research On Space Time Coding And Decoding Technology Of MIMO In High-Speed Environment

MIMO technology transmits the data on different sub-channels by using multi-antenna in the transmitter and receiver of the communication system,can realize the space-time multiplexing technology,and increases the information transmission rate and the spectrum utilization without increasing bandwidth and power.MIMO has been widely applied in the mobile communication.To satisfy requirement of communication in high-speed environment,mobile communication technology is developing towards broadband and digit,it can ensure the service quality of mobile communication system(including calling-time,handoff time,etc.).In view of the important role of MIMO technology,which can effectivily improve communication capacity and reliability of system,it has important theoretical and practical significance to carry out research of MIMO space time coding and decoding technology in high-speed environment and to provide guidance for design and parameter optimization of MIMO communication system in high-speed environment.In this paper,MIMO communication technology has been deeply studied,and the composition and communication mechanism of MIMO communication system,coding and decoding mechanism of STC has been emphatically analyzed.The common method of channel modeling and the application of MIMO technology have been analyzed.On this basis,the space-time coding and decoding method has been deeply studied in high-speed environment,and WINNER ? channel model and its modeling method has been analyzed,which is suitable for high-speed environment.Based on transmitted scenario of high-speed,the coding and decoding method of DBLAST,STBC,STTC and their communication performance has been deeply analyzed.With the characteristics of channel fading and path loss in high-speed environment,the MMSE-SIC decoding algorithm based on QR decomposition of modified Schmidt has been proposed.The QR decomposition of channel matrix using modified Gram Schmidt,can effectively reduce the rounding errors and improves bit error rate performance.The correctness and effectiveness has been verified through simulation.Further more,on the basis of D2 a “suburban macro cell” scenario and C3 “urban macro cell” scenario of WINNER ? channel model,which is applied to high-speed environment,the error performance of MIMO communication system utilizing different STC has been analyzed under different parameters.The error performance of MIMO communication system utilizing different STC has been analyzed in the condition of broadband and narrowband.Through the research of this paper,it provides basis and reference for design and parameter optimization of MIMO communication system in high-speed environment.