DocumentCode :
395970
Title :
Generalized selection combining based on the log-likelihood ratio
Author :
Kim, Sang Wu ; Kim, Young Gil ; Simon, Marvin K.
Author_Institution :
Korea Adv. Inst. of Sci. & Technol., South Korea
Volume :
4
fYear :
2003
fDate :
11-15 May 2003
Firstpage :
2789
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.
Keywords :
Rayleigh channels; diversity reception; error statistics; telecommunication signalling; Rayleigh fading channel; binary signaling; bit error probability; diversity combining; generalized selection combining scheme; log-likelihood ratio; maximum ratio combining; noncoherent envelope detection; square-law combining; Channel estimation; Context; Digital communication; Diversity reception; Envelope detectors; Error probability; Fading; Gas insulated transmission lines; Laboratories; Propulsion;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications, 2003. ICC '03. IEEE International Conference on
Print_ISBN :
0-7803-7802-4
Type :
conf
DOI :
10.1109/ICC.2003.1204505
Filename :
1204505
Link To Document :
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