A demodulator for frequency shift keyed signals

H - Electricity – 03 – D

Patent

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Details

H03D 3/00 (2006.01) H04L 25/06 (2006.01) H04L 27/144 (2006.01) H04L 27/156 (2006.01)

Patent

CA 2159225

A demodulator (414) for improving bit error rate performance consists of a zero threshold comparator circuit (502), a first threshold detector circuit (508), and a second threshold detector circuit (504). The first threshold detector circuit (508) compares the frequency information signal to a predetermined threshold, which is selected to optimize bit error rate performance. The second detector threshold circuit (504) is used to ensure that an alternating bit pattern has occurred. The demodulator (414) also includes a control device circuit (516) for coupling a plurality of bits (522) from a zero threshold comparator (502) to the output of the control device as a decision output signal (416) when the frequency information signal falls outside of either the first or second detector thresholds (508, 504). If the frequency information signal falls within both thresholds of the detector devices, then the decision output signal (416) for the control device (516) is formed by inverting the bit decision from the previous bit interval.

Démodulateur (414) destiné à améliorer les performances en matière de taux d'erreurs sur bits comprenant un circuit comparateur à seuil zéro (502), un premier circuit de détection de seuil (508) et un second circuit de détection de seuil (504). Le premier circuit de détection de seuil (508) compare le signal d'information de fréquence à un seuil prédéterminé, ayant été choisi pour optimiser les performances en matière de taux d'erreurs sur bits. Le second circuit de détection de seuil (504) vérifie qu'une configuration binaire alternative s'est produite. Le démodulateur (414) comporte également un circuit de dispositifs de commande (516) servant à coupler à la sortie du dispositif de commande (516) une série de bits (522) provenant du comparateur à seuil zéro (502) et servant de signal de décision de sortie (416) lorsque le signal d'information de fréquence tombe hors du premier ou du second seuil (508, 504) des dispositifs de détection. Si le signal d'information de fréquence tombe entre les deux seuils (508, 504) des dispositifs de détection, alors le signal de décision de sortie (416) destiné au dispositif de commande (516) se forme par inversion de la décision de bit de l'intervalle de bit antérieur.

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