Abstract
We propose a generalized selection combining (GSC) scheme for binary signaling in which M diversity branches providing the largest magnitude of log-likelihood ratio (LLR) are selected and combined. The bit error probability provided by LLR-based GSC serves as a lower bound on the bit error probability provided by any GSC techniques. We also propose a suboptimal GSC based on a noncoherent envelope detection. We derive the bit error probability with LLR-based and envelope-based GSC techniques and examine their power gains over the conventional SNR-based GSC technique. We show that the bit error probability with maximum ratio combining or square-law combining of L branches is identical to that with LLR-based GSC of L/2 branches.
Original language | English |
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Pages (from-to) | 2789-2794 |
Number of pages | 6 |
Journal | Conference Record - International Conference on Communications |
Volume | 4 |
State | Published - 2003 |
Event | 2003 International Conference on Communications (ICC 2003) - Anchorage, AK, United States Duration: 11 May 2003 → 15 May 2003 |
Keywords
- Diversity
- Envelope detection
- Generalized selection combining
- Log-likelihood ratio
- Rayleigh fading channel