Digitally adaptive modulated transmitter

H - Electricity – 04 – B

Patent

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Details

H04B 1/02 (2006.01) H04B 1/04 (2006.01)

Patent

CA 2529698

A circuit for use in a broadcast transmitter for adaptively compensating for carrier signal distortions caused by amplitude modulating an RF carrier signal. The circuit includes a modulator/amplifier network that receives an RF carrier signal and modulates it by a received amplitude varying signal to obtain therefrom a modulated carrier signal which may exhibit distortions caused by the amplitude modulating of the RF carrier signal. A digitally adaptive corrector precorrects the amplitude varying signal prior to application thereof to the network to compensate for any modulated carrier signal distortions. This includes a digital processor that provides signal correction as a function of digital samples representing amplitude variations of the modulated RF carrier signal.

L'invention concerne un circuit utilisé dans un émetteur de radiodiffusion afin de compenser de façon adaptative des distorsions de signal porteur entraînées par modulation d'amplitude d'un signal porteur RF. Le circuit comprend un réseau modulateur/amplificateur qui reçoit un signal porteur RF et qui le module au moyen d'un signal reçu à amplitude variable en vue d'obtenir à partir de celui-ci un signal porteur modulé qui peut présenter des distorsions entraînées par la modulation d'amplitude du signal porteur RF. Un correcteur adapté numériquement corrige préalablement le signal à amplitude variable avant de l'appliquer au réseau en vue de compenser des quelconques distorsions de signal porteur modulé. Ce correcteur comprend un processeur numérique qui fournit une correction de signal comme fonction d'échantillons numériques représentant des variations d'amplitude du signal porteur RF modulé.

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