A novel blast based on RAKE receiving for wireless communications

Bell layered space-time architecture (BLAST) is a multi-antenna communication structure with high spectrum efficiency, and it has found wide applications in LANs and WANs. However, its performance is much poorer than other space-time coding approaches. In order to improve its performance, a novel BLAST based on RAKE receiving is investigated in this paper. The new system introduces orthogonal spreading sequences (OSS) into the transmitter while retains the basic structure of BLAST. The proposed receiver suppresses interferences from other antennas by using orthogonality contained in the received signals and extracts information from each receive antenna by using RAKE receiving principle to construct efficient statistic decision. We discuss the proposed system over both frequency-flat and frequency-selective fading channels.