Method and device for adjusting a pulse detection threshold, and pulse detection and corresponding receiver
View Patent ↗The invention relates to a method for adjusting a pulse detection threshold consisting in detecting a pulse when the edge of said pulse envelop crosses the threshold, in allocating (A) a staring value (TH 0 ) to the threshold and in adjusting (B 1 ) the threshold (TH) in such a way that the number of pulses detected on at least one observation window (OW j ) satisfies a predetermined criterion in a determined time.
1. A method for adjusting a pulse detection threshold in a pulse detection device or in a pulse radio ultra wideband receiver, a pulse being detected when one of the edges of the envelope of said pulse crosses said threshold, which said method consists at least in:
allocating said threshold an initial value;
adjusting said threshold, by variation of the value of said threshold, so long as the number of pulses detected over at least one observation window in a symbol time does not satisfy a predetermined criterion depending on a number of pulses detectable per symbol time,
said adjustment being performed by iteration:
in a first direction corresponding to either an incrementation or a decrementation of the threshold, until the value of said threshold has attained a first bound;
in a second direction corresponding to either an incrementation or a decrementation of the threshold, said second direction being different from the first direction, if the value of said threshold has attained said first bound.
2. The method as claimed in claim 1 , in which the adjustment is performed in the first direction and the second direction in relation to a first and a second bound, respectively, the threshold value on attainment of one of said first or second bounds being adjusted by variation in the opposite direction with a different mode of variation.
3. The method as claimed in claim 1 , in which the number of iterations is a predetermined number.
4. The method as claimed in claim 1 , in which the adjustment until satisfaction of the criterion is renewed over at least one following symbol time.
5. The method as claimed in claim 1 , in which said predetermined criterion comprises a test of the number of pulses detected with respect to a value equal to the number of pulses detectable per symbol time or with respect to an interval about a value equal to the number of pulses detectable per symbol time.
6. The method as claimed in claim 1 , in which the observation window makes it possible to extract at least one part of the pulse with respect to which it is positioned, which part is sufficient to detect the pulse.
7. A method for detecting pulses in a pulse detection device or in a pulse radio ultra wideband receiver, a pulse being detected when one of the edges of the envelope of said pulse crosses a threshold, method comprising an adjustment of said threshold, by variation of the value of said threshold, so long as the number of pulses detected over at least one observation window in a symbol time does not satisfy a predetermined criterion depending on a number of pulses detectable per symbol time, said adjustment being performed by iteration:
in a first direction corresponding to either an incrementation or a decrementation of the threshold, until the value of said threshold has attained a first bound;
in a second direction corresponding to either an incrementation or a decrementation of the threshold, said second direction being different from the first direction, if the value of said threshold has attained said first bound.
8. A device for adjusting a pulse detection threshold, a pulse being detected when one of the edges of the envelope of said pulse crosses said threshold, this device comprising at least:
means for allocating an initial value to said threshold;
means for adjusting said threshold, by variation of the value of said threshold, so long as the number of pulses detected over at least one observation window in a symbol time does not satisfy a predetermined criterion depending on a number of pulses detectable per symbol time, said adjustment being performed by iteration:
in a first direction corresponding to either an incrementation or a decrementation of the threshold, until the value of said threshold has attained a first bound;
in a second direction corresponding to either an incrementation or a decrementation of the threshold, said second direction being different from the first direction, if the value of said threshold has attained said first bound.
9. A device for detecting pulses, comprising;
means for allocating an initial value to a threshold;
means for adjusting said threshold, by variation of the value of said threshold, so long as the number of pulses detected over at least one observation window in a symbol time does not satisfy a predetermined criterion depending on a number of pulses detectable per symbol time, said adjustment being performed by iteration:
in a first direction corresponding to either an incrementation or a decrementation of the threshold, until the value of said threshold has attained a first bound;
in a second direction corresponding to either an incrementation or a decrementation of the threshold, said second direction being different from the first direction, if the value of said threshold has attained said first bound;
actual detection means delivering the detected pulse information when one of the edges of the envelope of said pulse crosses the adjusted threshold.
10. An ultra wideband receiver of a pulse radio signal, including pulses over each successive symbol time, this receiver comprising at least:
means for extracting the envelope of said pulses, said extraction means delivering envelope signals;
detection means comparing said envelope signals with an adjustable threshold value, delivering detected pulses;
means for calculating and adjusting said threshold value as a function of the number of pulses detected over at least one observation window, said adjustment being performed by iteration:
in a first direction corresponding to either an incrementation or a decrementation of the threshold, until the value of said threshold has attained a first bound;
in a second direction corresponding to either an incrementation or a decrementation of the threshold, said second direction being different from the first direction, if the value of said threshold has attained said first bound.
11. A computer program stored on a non-transitory computer readable storage medium, comprising a series of instructions, which, during their execution, allow the implementation of the method for adjusting the threshold, as claimed in claim 1 .
12. The computer program as claimed in claim 11 , characterized in that said program installed in a calculation unit in a device selected from a group consisting of a threshold adjustment device, a pulse detection device, and an ultra wideband receiver.
13. A computer program stored on a non-transitory computer readable storage medium, comprising a series of instructions, which, during their execution, allow the implementation of the method for adjusting the threshold, as claimed in claim 7 .