Design of near-orthogonal LD space-time codes
2004 (English)In: 2004 INTERNATIONAL ZURICH SEMINAR ON COMMUNICATIONS: ACCESS-TRANSMISSION-NETWORKING, PROCEEDINGS, NEW YORK: IEEE , 2004, 10-13 p.Conference paper (Refereed)
This work considers a wireless multi-input-multi-output (MIMO) communication system in a frequency-nonselective scenario with spatially uncorrelated Rayleigh fading channel coefficients and investigates the design of linear dispersion (LD) space-time block codes. By optimizing the constituent weight matrices so that an upper bound on the union bound of the codeword error probability is minimized, good LD codes are obtained regardless of transmit antenna array size and code rate. We make the interesting observation that the proposed design procedure automatically generates LD codes that either correspond to, or are close to, the well-known class of orthogonal space-time block (OSTB) codes. A theoretical analysis confirms the correctness of the observation by proving that OSTB codes are indeed optimal, when the setup under study permit their existence. Simulation results demonstrate the excellent performance of the designed codes. In particular, the importance of the codes' near-orthogonal property is illustrated by showing that low-complexity linear equalizer techniques can be used for decoding purposes while incurring a relatively small performance loss compared with optimal maximum likelihood (ML) decoding.
Place, publisher, year, edition, pages
NEW YORK: IEEE , 2004. 10-13 p.
IdentifiersURN: urn:nbn:se:kth:diva-44770ISI: 000221464900001ScopusID: 2-s2.0-2442526805ISBN: 0-7803-8329-XOAI: oai:DiVA.org:kth-44770DiVA: diva2:451312
IEEE International Zurich Seminar on Communications Location: ETH, Zurich, SWITZERLAND Date: FEB 18-20, 2004
QC 201110252011-10-252011-10-252011-11-02Bibliographically approved