Method and apparatus for detection of a communication signal

Details Method and apparatus for detection of a communication signal Method and apparatus for detection of a communication signal

1995-09-29

1998-07-21

Bocure, Tesfaldet

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375336, H04L 2706, H04L 2714

Patent

active

057844160

ABSTRACT:
The disclosed communication unit functions to detect a signal by detecting the zero crossing of a current sample (and prior samples) and determining a sample value for each sample, and to determine an estimated bit value of a previous sample based on upper and lower node metrics. In the preferred embodiment a two-state decoder is used. Using prior sample values, the possible upper and lower node path distance metrics are first determined, then path difference metrics are determined for each node based on the path distance metrics. The difference metrics are then compared against a threshold, preferably zero, to determine the estimated bit value (or which surviving path to use) in decoding a prior sample.

REFERENCES:
patent: 4599732 (1986-07-01), LeFever
patent: 4745625 (1988-05-01), Eyuboglu
patent: 5001724 (1991-03-01), Brigenbeier et al.
patent: 5384560 (1995-01-01), Yamasaki

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