Phaselock threshold correction

Details Phaselock threshold correction Phaselock threshold correction

1998-06-30

2000-07-25

Le, Amanda T.

Pulse or digital communications

Receivers

Angle modulation

375227, 375327, 375345, 4552451, H04L 2722, H04L 2708

Patent

active

060944633

ABSTRACT:
A noise estimator for threshold correction of a receiver includes a low pass filter to remove wideband noise from an input signal that includes a signal component and a noise component. The output of the wideband filter is applied to a square-law power detector having an output applied to an envelope detector. The output of the envelope detector is the instantaneous envelope of the input signal and is applied to a low pass filter to perform time averaging and is also applied to a differential network. The output of the low pass filter is a signal representing a time averaged statistical envelope representing the statistical mean of the instantaneous envelope of the input signal. This signal is also applied to the differential network that generates a signal representing the difference in the instantaneous envelope of the input signal and the time averaged statistical envelope signal. This difference signal is applied to a square-law power detector and then to a low pass filter for time averaging. An output of the low pass filter is a signal representing an estimate of the noise component of the input signal.

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