Amplitude limitation in a cdma system

H - Electricity – 04 – B

Patent

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H04B 1/62 (2006.01) H04B 1/707 (2006.01)

Patent

CA 2328167

In a telecommunications network that employs a CDMA scheme, the amplitude associated with each independent CDMA carrier is digitally limited, thereby limiting the peak-to-average power ratio. This, in turn, is accomplished by measuring the instantaneous amplitude for the in-phase and quadrature signals that make up each CDMA carrier, deriving a maximum amplitude based on the instantaneous amplitude measurements, and then deriving one or more scaling factors based, in-part, on maximum amplitude. The one or more scaling factors are then applied to the in-phase and quadrature signals, which are subsequently filtered, combined and modulated by a corresponding CDMA carrier frequency.

Dans un réseau de télécommunications qui fait appel à un schéma AMCR, l'amplitude associée à chaque porteuse AMCR est numériquement limitée, ce qui limite le rapport valeur de crête sur valeur moyenne. On réalise cette limitation en mesurant l'amplitude instantanée des signaux en phase et en quadrature, qui constituent chaque porteuse AMCR, en dérivant une amplitude maximum sur la base des mesures d'amplitude instantanée, en dérivant un ou pusieurs facteurs de proportionnalité, en partie sur la base de l'amplitude maximum. Les facteurs de proportionnalité sont ensuite appliqués aux signaux en phase et en quadrature, lesquels sont par la suite filtrés, combinés et modulés par une fréquence porteuse AMCR correspondante.

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