Psk demodulator

H - Electricity – 04 – L

Patent

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Details

H04L 27/22 (2006.01) H04L 7/033 (2006.01) H04L 27/233 (2006.01) H04L 27/00 (2006.01)

Patent

CA 2130269

A demodulator responsive to a symbol containing analog signal includes a pair of relatively inexpensive analog-to-digital converters for sampling I and Q channels of the signal only once per symbol. A derotator responsive to outputs of the converters and a digital signal representing frequency and phase corrections for an input to the demodulator operates in accordance with a CCRDIC function to derive I and Q channel digital signals that are compensated by the corrections. A digital phase shifter responsive to at least one of the digital I and Q signals controls when the input is sampled by the converter.

Un démodulateur sensible à un signal analogique contenant un symbole est constitué d'une paire de convertisseurs analogique-numérique relativement bon marché qui échantillonnent les bandes I et Q du signal seulement une fois par symbole. Un dérotateur sensible aux sorties des convertisseurs et à un signal numérique représentant les corrections de fréquence et de phase pour une entrée dans le démodulateur fonctionne selon une fonction CORDIC pour dériver les signaux numériques à bandes I et Q compensés par les corrections. Un déphaseur numérique sensible à au moins un des signaux numériques I et Q commande l'échantillonnage de l'entrée par le convertisseur.

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