Method and circuit for detecting burst signal

Details Method and circuit for detecting burst signal Method and circuit for detecting burst signal

H - Electricity

04

B

H04B 1/16 (2006.01) H04L 27/00 (2006.01) H04L 27/22 (2006.01) H04M 11/06 (2006.01)

Patent

CA 2080323

A phase angle ~ of a received signal is calculated according to a formula ~ = tan-1 (Q/I), where I and Q are magnitudes of baseband signals obtained by quadrature detection of the received signal, and an angular velocity .DELTA.~ of the phase angle ~ is calculated. A variance parameter .SIGMA.~ is calculated from a deviation ~ = .DELTA.~ - .DELTA.~, where .DELTA.~ is a moving average of the .DELTA.~, andthe variance parameter .SIGMA.~ thus calculated is compared with a reference value to decide existence of a burst signal. Since the decision is performed essentially not based on an amplitude of the received signal but based on a phase of the received signal, fluctuation of the amplitude of the received signal does not affect the decision.

L'angle de phase d'un signal reçu est calculé d'après la formule = Arc tg (Q/I), où I et Q sont les amplitudes des signaux de bande de base obtenus par détection en quadrature du signal reçu, et la vitesse angulaire associée à l'angle de phase est calculée. La variance est définie par la différence - , où est la moyenne glissante de . La variance ainsi calculée est comparée à une valeur de référence pour établir la présence d'un signal en salve. Étant donné que la décision est basée non sur l'amplitude du signal reçu, mais sur sa phase, les fluctuation d'amplitude du signal reçu n'ont aucun effet sur cette décision.

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