A New Performance Enhancement Algorithm for Space-time Block Coding in OFDM Systems

In this paper, a new performance enhancement algorithm for Space-Time Block Coding in OFDM System, which is an adaptive transmit optimization beam forming STBC-OFDM system based on Channel State Information (CSI), is proposed. And, the optimization beamforming weight vector is derived in case of maximal receiver Signal-to. Noise Ratio (SNR). Theoretic analysis and computer simulation results of the system over wireless Reyleigh fading channels show that the system can explore all the diversity resource and performance can be improved significantly compared-with traditional STBC-OFDM system. In addition, the performance of enhancement algorithm is better than STTC-OFDM system and TCM-STBC-OFDM system in the case of higher receiver SNR.