H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 27/22 (2006.01) H04B 7/26 (2006.01) H04L 27/233 (2006.01)
Patent
CA 2175672
Selectable demodulation means within a given receiver to demodulate signals potentially subjected to many different types of degradations as typically encountered in mobile communications systems, and to select the best result to provide significant performance improvement is disclosed. In accordance with the method, when an RF signal is received, it is sampled and the samples are demodulated. Demodulation is performed using both coherent and non-coherent schemes with the preferred scheme selected according to the quality of performance of each demodulator. Coherent demodulation can provide better performance when the signal is subjected to significant path loss but little fading. Non-coherent demodulation can provide better performance when the signal is subjected to less path loss but significant fading. Details of the method are disclosed.
Moyen sélectif de démodulation à l'intérieur d'un récepteur donné de signaux potentiellement soumis aux nombreux types de dégradations qui peuvent survenir dans les sytèmes mobiles de radiocommunications, et de sélection des meilleurs résultats en vue d'une amélioration significative des performances. Selon ce procédé, lorsqu'un signal HF est reçu, il est échantillonné et les échantillons sont démodulés selon des schémas à la fois cohérents et non cohérents dont le plus adéquat est choisi en fonction de la qualité des performances de chacun des démodulateurs. La démodulation cohérente fournit les meilleurs performances lorsque le signal subit d'importantes pertes sur un trajet, mais pas d'affaiblissement; la démodulation non cohérente fournit les meilleurs performances lorsque le signal subit de faibles pertes sur un trajet mais un affaiblissement important. Des détails sur le procédé sont fournis
Adc Mobile Systems Inc.
Adc Telecommunications Inc.
Riches Mckenzie & Herbert Llp
LandOfFree
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