H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 1/18 (2006.01) H04B 1/40 (2006.01) H04B 1/69 (2006.01) H04B 1/707 (2006.01) H04L 27/00 (2006.01) H04B 1/00 (2006.01)
Patent
CA 2198791
The object of the invention is a method and a circuit arrangement for processing a spread spectrum signal and a frequency modulated signal. According to the invention the radio frequency signal is received (1, 2), the received signal is converted into an intermediate frequency signal (3, 4a, 4b), and then an intermediate frequency signal processing (6, 30, 31, 40) is made and the processed intermediate frequency signals are converted (32, 42a, 42b) into baseband signals. The signal derived from the received signal is converted (41) into a digital sampled signal which is processed (32, 42a, 42b, 111, 120, 121) digitally, whereby the either a signal derived from the received spread spectrum signal or a signal derived from the received frequency modulated signal, respectively, is selected (5) as the signal which is converted to the digital sampled signal. According to the invention the same intermediate frequency and baseband components (6, 7, 30, 31, 40, 41) can be used to process both the spread spectrum signal and the frequency modulated signal.
Cette invention a pour objet une méthode et un circuit pour le traitement d'un signal à spectre étalé et d'un signal modulé en fréquence. Un signal de radiofréquence est reçu (1, 2), le signal reçu est converti en signal de fréquence intermédiaire (3, 4a, 4b), puis le signal de fréquence intermédiaire subit un traitement (6, 30, 31, 40), et les signaux de fréquence intermédiaire sont convertis (32, 42a, 42b) en signaux de bande de base. Le signal dérivé du signal reçu est converti (41) en signal numérique échantillonné qui est traité (32, 42a, 42b, 111, 120, 121) numériquement : soit un signal dérivé du signal à spectre étalé reçu, soit un signal dérivé du signal modulé en fréquence reçu est sélectionné (5) comme signal à convertir en signal numérique échantillonné. D'après l'invention, les mêmes composants de fréquence intermédiaire et de bande de base (6, 7, 30, 31, 40, 41) peuvent être utilisés pour traiter tant le signal à spectre étalé que le signal modulé en fréquence.
Nokia Mobile Phones Ltd.
Sim & Mcburney
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