An Efficient Detector for Non-Orthogonal Space-Time Block Codes with Receiver Antenna Selection

A new architecture for detection of layered quasi-orthogonal space-time block codes (LQOSTBC) with receiver antenna selection over Rayleigh fading channels is presented. The LQOSTBC transmitter consists of a full-rate quasi-orthogonal space-time block code unit, plus one antenna operating as V-BLAST. The LQOSTBC receiver selects n_R out of a total of N_R available antennas using a low-complexity, nearly optimal algorithm. The proposed receiver is based on successive interference cancellation (SIC) and the QR decomposition, suggesting a simple hardware implementation. It is designed for zero-forcing (ZF) criterion and a spatially uncorrelated channel. Reduced complexity is achieved by means of a convenient rearrangement of the channel matrix elements. The detection scheme proposed is compared to similar, recently reported techniques.