High-Rate Space-Time Coded Large MIMO Systems: Low-Complexity Detection and Performance

— Large MIMO systems with tens of antennas in each communication terminal using full-rate non-orthogonal spacetime block codes (STBC) from Cyclic Division Algebras (CDA) can achieve the benefits of both transmit diversity as well as high spectral efficiencies. Maximum-likelihood (ML) or nearML decoding of these large-sized STBCs at low complexities, however, has been a challenge. In this paper, we establish that near-ML decoding of these large STBCs is possible at practically affordable low complexities. We show that the likelihood ascent search (LAS) detector, reported earlier by us for V-BLAST, is able to achieve near-ML uncoded BER performance in decoding a 32×32 STBC from CDA, which employs 32 transmit antennas and sends 322 = 1024 complex data symbols in 32 time slots in one STBC matrix (i.e., 32 data symbols sent per channel use). In terms of coded BER, with a 16 × 16 STBC, rate-3/4 turbo code and 4-QAM (i.e., 24 bps/Hz), the LAS detector performs close to within just about...

• Type: Conference
• Year: 2008
• Where: GLOBECOM
• Authors: Saif K. Mohammed, Ananthanarayanan Chockalingam, B. Sundar Rajan
• Keywords: Efficiency Large Mimo, GLOBECOM 2008, Large Mimo Systems, Low Complexities, Telecommunications