Generalized ABBA-V-BLAST hybrid space-time code for wireless communications

Abstract

Hybrid MIMO communication systems combine spatial multiplexing with diversity gain to achieve both high spectral efficiency and link reliability. We present a novel generalized hybrid scheme that allows the use of any number of spatial multiplexing layers (V-BLAST) and any number of quasi-orthogonal layers (ABBA).We also present a low-complexity, ordered, successive interference cancellation receiver based on sorted QR decomposition. The receiver detects each symbol in the same manner, regardless of whether it was spatially or diversity coded, simplifying the receiverpsilas formulation. We show that this novel scheme outperforms other recent hybrid schemes in terms of bit error rate, even when there is precoding at the transmitter. We also show our proposal has lower complexity, achieved by exploiting the structure of the linear dispersion matrices.