Multiuser MIMO Communications using Interleave-Division Multiple-Access and Golden Codes

Interleave-division multiple-access (IDMA) has recently been proposed as a multiuser scheme that uses low complexity turbo-like iterative receivers and can outperform coded CDMA. In this paper we introduce a MIMO multiuser scheme that combines IDMA with the golden code (GC), a 2 x 2 space-time code that achieves the optimal diversity-multiplexing gain trade off. We compare the performance of this GC-IDMA scheme against MIMO-IDMA schemes employing the Alamouti code and V-BLAST, and also against the single-user bound. In a Rayleigh flat-fading environment, simulation results show that GC-IDMA outperforms both Alamouti- and V-BLAST-IDMA at moderate and high SNR levels. For signal to noise ratios of 8 dB and greater, the GC-IDMA scheme employing 16 users approaches within 0.25 dB of the single-user bound.