Patent ID: 7907923

Claim:
Method for squelch gating a receiving signal depending on the level of phase noise in said receiving signal, said method comprising following steps: determining sampled amplitudes and sampled phases of said receiving signal, determining sampled phase noise by differentiating subsequent sampled phases, determining a squelch signal by rectifying and averaging said sampled phase noise, determining a start point of gating after a dropping of said squelch signal below a higher threshold delayed by a first delay time, determining an end point of gating after a rising of said squelch signal above a lower threshold delayed by a second delay time; selecting a first time interval relative to said rising of said squelch signal above said higher threshold for said start point of gating; selecting a second time interval relative to said dropping of said squelch signal below said lower threshold for said end point of gating; calculating a third delay time for delaying said sampled amplitudes at said start point of gating corresponding to the summation of said first time interval relative to said rising of said squelch signal above said higher threshold and said first delay time, calculating a fourth delay time for delaying said sampled amplitudes at said end point of gating corresponding to the summation of said second time interval relative to said dropping of said squelch signal below said lower threshold and said second delay time, whereby a maximum delay time of said first delay time and of said second delay time for delaying said sampled amplitudes is chosen and said first delay time and said second delay time is recalculated in the size of said chosen maximum delay time, and choosing the maximum delay time of said third delay time and of said fourth delay time for delaying said sampled amplitudes; gating said sampled amplitudes from said start point of gating until said end point of gating; and continuously increasing said gating from an inactive gating level up to an active gating level during a first fading time beginning at a start point of gating respective ending at a start point of gating and is continuously decreasing from said active gating level down to said inactive fading level during a second fading time beginning at an end point of gating respective ending at an end point of gating.