| Paper: | SPCOM-P2.11 | ||
| Session: | Wireless Access and Networking | ||
| Time: | Tuesday, May 18, 15:30 - 17:30 | ||
| Presentation: | Poster | ||
| Topic: | Signal Processing for Communications: Space-Time Coding and Transmit Diversity | ||
| Title: | SPHERE DECODING FOR RETRANSMISSION DIVERSITY IN MIMO FLAT-FADING CHANNELS | ||
| Authors: | Harvind Samra; University of California, Davis | ||
| Zhi Ding; University of California, Davis | |||
| Abstract: | In this paper, 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, inreducing BER and reducing computational complexity, is analyzed. | ||
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