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Sphere decoding for retransmission diversity in MIMO flat-fading channels

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2 Author(s)
Samra, Harvind ; Dept. of Electr. & Comput. Eng., California Univ., Davis, CA, USA ; Zhi Ding

We define an ARQ protocol for MIMO flat-fading channels which varies the bit-to-symbol mapping per retransmission. We begin by defining a model for distinctly mapped transmissions through MIMO channels, and the effect this mapping diversity has on a sphere decoder receiver. Varying the symbol mapping complicates the sphere decoding process, particularly for the enumeration of candidate solutions within the sphere. A technique that promises quick candidate enumeration is suggested, borrowing concepts from existing closest point search schemes. The value of mapping diversity, in reducing BER and reducing computational complexity, is analyzed.

Published in:

Acoustics, Speech, and Signal Processing, 2004. Proceedings. (ICASSP '04). IEEE International Conference on  (Volume:4 )

Date of Conference:

17-21 May 2004