Abstract: A new BLAST is proposed, which introduces orthogonal spreading sequences to the original system using the basic structure of BLAST. The receiver suppresses interferences from other antennas by the orthogonal information contained in the received signals. The information from the corresponding "layer" is extracted from every receive antenna by the RAKE receiver to form efficient statistic decision. Simulation results show that the performance achieved by teh proposed BLAST outperforms ZF-based BLAST and STBC in the case of a low SNR.

Key words: BLAST(bell layered space-time architecture), MIMO(multi-input multi-output), orthogonal spreading sequence