Continuous integration digital demodulator for use in a communic

Details Continuous integration digital demodulator for use in a communic Continuous integration digital demodulator for use in a communic

1997-09-19

1999-09-07

Pham, Chi H.

Pulse or digital communications

Receivers

Angle modulation

375340, 455255, H04L 2714

Patent

active

059498277

ABSTRACT:
A digital demodulator (100) for use in a communication device comprising a mixer (110) which samples a limited IF signal derived from a received radio frequency (RF) signal at a rate less than a Nyquist rate of the limited IF signal and generates a resulting IF signal. A continuous integrator (130) is connected to the mixer (110) and integrates the resulting IF signal over a predetermined number of samples thereof to generate a numerical value representative of a modulation frequency of a limited IF signal. An adaptive peak-valley bit slicer (150) is connected to the continuous integrator (130) and compares each numerical value with a peak threshold, a valley threshold and a mid threshold and generates most-significant-bit (MSB) and least-significant-bit (LSB) values for each sample. The adaptive peak-valley bit slicer (150) adjusts the peak and valley thresholds for use in determining a level of a current numerical value based on the LSB and MSB values determined for a prior sample of the numerical value.

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