Application of SQRD Algorithm for Efficient MIMO-OFDM Systems

High data rate techniques in wireless communication systems have gained considerable significance in recent years. A strong candidate for broadband wireless communication systems for achieving high data rate and combating mutipath fading is OFDM (Orthogonal Frequency Division Multiplexing). Combining OFDM with multiple antenna systems has been shown to provide significant increase in the capacity in rich-scattering environments. In this paper, we combine a MIMO (Multiple Input Multiple Output) system based on the V-BLAST architecture with OFDM multicarrier transmission. The receiver is implemented using previously proposed sorted QR decomposition (SQRD) for the successive interference cancellation (SIC) between the different transmitted data streams. We will show a significant performance improvement of this technique over linear detection algorithms. In addition, we evaluate the influence of the incorporation of a soft output detector on the bit error rate (BER) performance.