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.(1).