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| 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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