Spread spectrum receiver for use in communication systems

H - Electricity – 04 – B

Patent

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Details

H04B 1/69 (2006.01) H04B 1/707 (2006.01) H04B 7/005 (2006.01) H04B 7/02 (2006.01) H04B 7/26 (2006.01) H04Q 7/20 (2006.01)

Patent

CA 2221919

A spread spectrum receiver for use in a mobile communication system is provided which includes a plurality of spread spectrum demodulators, a diversity combiner, a power level detector, a correlation determining circuit, a signal combination determining circuit, and a demodulator phase control circuit.. The correlation determining circuit determines correlation among input multipath signals transmitted through different transmission paths. The signal combination determining circuit selects the same number as that of the spread spectrum demodulators out of the multipath signals, which minimizes a drop in power level of a diversity combined signal outputted from the diversity combiner according to the determined correlation. The demodulator phase control circuit controls phases of demodulating operations of the spread spectrum demodulators to demodulate the selected multipath signals, respectively.

L'invention est un récepteur de signaux à spectre étalé pour système de communication mobile qui comprend une pluralité de démodulateurs de signaux à spectre étalé, un combinateur de diversité, un détecteur de niveau de puissance, un circuit de détermination de corrélation, un circuit de détermination de combinaisons de signaux et un circuit de commande de phase pour les démodulateurs. Le circuit de détermination de corrélation détermine la corrélation entre les signaux reçus via des trajets de transmission différents. Le circuit de détermination de combinaisons de signaux sélectionne, parmi les signaux à trajets multiples, le même nombre de signaux que les démodulateurs de signaux à spectre étalé, ce qui minimise la baisse du niveau de puissance du signal de diversité produit par le combinateur de diversité selon la corrélation déterminée. Le circuit de commande de phase commande les phases des opérations de démodulation sur les signaux à trajets multiples sélectionnés.

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