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On optimal constellations for quasi-orthogonal space-time codes

: Sezgin, A.; Jorswieck, E.A.

IEEE Signal Processing Society:
IEEE International Conference on Acoustics, Speech, and Signal Processing 2003. Proceedings. Vol.4: Signal processing for communications. Special sessions : April 6- 10, 2003, Hong Kong Convention & Exhibition Center, Hong Kong
Piscataway: IEEE Operations Center, 2003
ISBN: 0-7803-7663-3
International Conference on Acoustics, Speech, and Signal Processing (ICASSP) <2003, Hong Kong>
Conference Paper
Fraunhofer HHI ()

Space-Time Block Codes (STBC) exploit multiple-input multiple-output (MIMO) communication systems in order to obtain diversity for high link reliability. Unfortunately, it is not possible to construct STBC with transmission rate equal one for more than two transmit antennas. A way to achieve higher transmission rates is to use quasiorthogonal STBC (QSTBC). We can improve the performance of QSTBC through a special constellation rotation. In this work, we analytically derive the optimal rotation. Numerical simulations show that our analytical approach outperforms the regular QSTBC as well as approaches, where a simulative method is used in order to obtain better performance in comparison to regular QSTBC. In addition to this, we study the impact of the rotation on the achievable portion of the outage capacity.