Phase compensation method and apparatus

H - Electricity – 04 – B

Patent

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Details

H04B 1/16 (2006.01) H03D 1/04 (2006.01) H04B 1/10 (2006.01) H04Q 7/32 (2006.01)

Patent

CA 2102108

The present disclosure includes a discussion of a method of compensating for distortion of a received signal's phase. The distortion is caused by the asymmetrical characteristics of a voltage limiter (301). This compensation allows the received signal (115) to be sampled at the positive and negative zero-crossings reducing the requirements of a local oscillator in a radiotelephone system. First, the phase of the received signal is sampled at the positive and negative zero-crossings, forming a corresponding positive-crossing (401) and a negative-crossing (407) phase value for the received signal. Second, the negative-crossing and positive-crossing phase values are combined, forming a first difference signal (409). Third, an estimated error signal (417) is formed using the first difference signal. Fourth, the estimated error signal is combined (419) with the positive or negative zero-crossing phase signals, substantially eliminating the asymmetrical distortion.

La présente description comporte un exposé sur un procédé de compensation de la distorsion de phase d'un signal reçu. Cette distorsion provient des caractéristiques asymétriques du limiteur de tension (301). La compensation permet d'échantillonner le signal reçu (115) aux croisements du zéro positif et négatif, ce qui réduit le recours à un oscillateur local dans un système de radiotéléphone. On échantillonne en premier lieu la phase du signal reçu aux croisements du zéro positif et négatif, ce qui fournit une valeur de phase correspondante de croisement positif (401) et de croisement négatif (407) concernant le signal reçu. On combine en deuxième lieu ces valeurs de phase de croisement positif et de croisement négatif pour engendrer un premier signal de différence (409). En troisième lieu, on engendre un signal d'erreur estimé (417) en utilisant le premier signal de différence. En quatrième lieu, on combine (419) le signal d'erreur estimé avec les signaux de phase des croisements du zéro positif et négatif pour éliminer en pratique la distorsion asymétrique.

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