Demodulator for cellular digital packet data system

Details Demodulator for cellular digital packet data system Demodulator for cellular digital packet data system

H - Electricity

04

L

H04L 27/148 (2006.01) H04B 7/26 (2006.01) H04L 27/233 (2006.01)

Patent

CA 2141135

A decision feedback multiple symbol differential demodulator for Gaussian filtered Minimum Shift Keying (GMSK) has a performance very close to theoretical limit even under a fading channel. The demodulator implements a non-coherent, maximum likelihood (ML) search over multiple bit-time intervals. The past bit decisions are fed back to the ML decision logic. The improved performance of the demodulator is achieved by using old decisions in the ML decision logic.

Démodulateur différentiel de symboles multiples à décision rétroactive pour MDMG (modulation par déphasage minimal avec filtrage gaussien), ayant une performance très voisine de la limite théorique même pour un canal à évanouissement. Le démodulateur effectue une recherche non cohérente de vraisemblance maximale sur des multiples intervalles de temps entre bits. Les décisions binaires passées sont retournées à la logique de décision à vraisemblance maximale. La performance améliorée du démodulateur est attribuable à l'utilisation de décisions antérieures de ladite logique.

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