Dsp implementation of a cellular base station receiver

H - Electricity – 03 – D

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H03D 3/00 (2006.01) H04B 1/10 (2006.01) H04B 1/30 (2006.01)

Patent

CA 2258009

Demodulating FM signals using digital signal processing extracts a carrier signal from digitized channel signals, multiplies the digital channel signal with this extracted carrier signal, and further filters out the carrier signal to produce the demodulated signal. The DSP technique first down converts a group of channels to baseband which are then processed through an A/D converter to produce a digitized composite signal. A bank of bandpass filters, typically based on FFT processors, applied to the composite signal produce (a group of) digitized channel signal(s). The digitized channel signal is then demodulated by recovering a carrier signal by digitally filtering, for example, using a Hilbert bandpass filter, the channel signal and digitally filtering the product of the carrier signal and the channel signal to recover the modulating voice signals.

La démodulation de signaux FM à l'aide d'un traitement numérique des signaux extrait un signal de porteuse de signaux de canaux numérisés, multiplie le signal du canal numérique par ce signal de porteuse extrait, et ensuite filtre le signal de porteuse afin de produire le signal démodulé. La technique du traitement numérique de signaux tout d'abord transpose par abaissement un groupe de canaux à une bande de base, lesquels sont ensuite traités par un convertisseur A/N afin de produire un signal composite numérisé. Un groupe de filtres passe-bande, constitué typiquement de processeurs TSP, appliqué au signal composite produit un signal ou un groupe de signaux de canaux numérisés. Le signal de canaux numérisés est ensuite démodulé par récupération d'un signal de porteuse par filtrage numérique, par exemple, à l'aide d'un filtre passe-bande de Hilbert, du signal des canaux et filtrage numérique du produit du signal de porteuse et du signal de canaux afin de récupérer les signaux vocaux de modulation.

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