Research On Channel Estimation Technique In MIMO-OFDM System

MIMO technology combined with OFDM technology has become an inevitable development trend of the future of communications, the combination of these two technologies can dramatically improve the wireless communication system, channel capacity, communication reliability, and transmission rate, can be effective against multi-path fading, interference suppression and noise, has aroused widespread concern in the communications sector.In this paper, an improved algorithm is proposed, which is based on the classical channel estimation algorithm (LS algorithm). Simulation shows that the improved algorithm is better than the traditional algorithms in performance. Besides, several training sequence design methods are introduced. Then the paper gives design methods of the optimal training sequence in the MIMO systems combined with orthogonality principle, and also gives the the pilot design principles in the MIMO systems.Then based on LS estimation minimum mean-square error,the author gives several pilot design programs. While the pilot program proposed in this paper is different from the traditional pilot program, and has better improvement in performance. A full design simulation of the training sequences and the pilot programs mentioned above is carried out in the MATLAB environment, then a comprehensive analysis and comparison of the program effectiveness and feasibility is given. At last, the FPGA implementation of SISO Channel Estimation is given, which is based on DVB-T system pilot scheme. QuartusⅡtiming simulation shows the feasibility of the FPGA implementation.