IMPLEMENTATION OF MIMO OFDM STF CODING FRAMEWORK FOR WIRELESS COMMUNICATION SYSTEM

摘要

The current problems in wireless systems are multi-path propagation, frequency selective fading, inter-symbol interference and inter-carrier interference. A major challenge being transmission of information having high data rates over long distances. The Orthogonal Frequency Division Multiplexing (OFDM) systems solve a few of these problems which are mentioned above. This Paper makes an attempt to simulate Space Time Frequency coded communication system using diversity schemes like MIMO and Multiple Input Single Output (MISO) and compares their performances over a fading channel having inherent noise. On simulation in MATLAB 7.0.1, MIMO scheme performed better than MISO in comparison of bit error rates with respect to signal to noise ratios. Paper also compares the channel capacity obtained by various MIMO diversities as function of signal to noise (SNR) ratio and proves that as diversity increases the channel capacity increases.