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The Alamouti Code Assisted V-BLAST (ACAV) is a promising hybrid MIMO transmission scheme that is adopted by IEEE 802.11n-2009 (WiFi) recently. It combines Spatial Multiplexing (SM) and Alamouti Space-Time Block Codes (STBC) so that if the Alamouti symbols were detected first, which are generally more reliable due to STBC, subsequent Interference Cancelation (IC) stages will suffer less from error propagation. The optimal IC detector for the ACAV can be undesirably complex but the authors found a procedure to reduce the complexity and processing time without compromising its optimality. They further developed a simpler suboptimal detector that is suitable for rapidly varying channels. Simulation results show both ACAV detectors can outperform the detectors of pure SM scheme of the same data rate.
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