Method for correcting errors from a jamming signal in a frequenc

Details Method for correcting errors from a jamming signal in a frequenc Method for correcting errors from a jamming signal in a frequenc

1996-12-04

1998-08-11

Vo, Don N.

Pulse or digital communications

Repeaters

Testing

375202, 375285, 375275, H04B 169, H04B 1713

Patent

active

057937958

ABSTRACT:
A selective call communication system (10) has a selective call device (100) for transmitting a frequency hopped spread spectrum signal (320) encoded as Reed Solomon code words and modulated as a four-level frequency shift keying (4FSK) signal. A base site transceiver (156) receives the signal on a plurality of narrow band channels. A digital signal processor (DSP)(152) performs a fast fourier transform on the signal to generate frequency samples. The DSP (152) has a comparator (342) that compares an 4FSK symbol to a predetermined threshold, a determinator (344), in response to the comparator (342), determines when there is an interference signal jamming the narrow band channel, an erasure marker (346) marks a position in the Reed Solomon symbol determined to be jammed as an erasure and an error correcting code (348) corrects errors in the Reed Solomon code words marked with erasures.

REFERENCES:
patent: 4933954 (1990-06-01), Petry
patent: 5259030 (1993-11-01), Francis
patent: 5265128 (1993-11-01), Widmer et al.
patent: 5282222 (1994-01-01), Fattouche et al.
patent: 5426653 (1995-06-01), Hayes et al.
patent: 5450612 (1995-09-01), Chanroo et al.
patent: 5548582 (1996-08-01), Brajal et al.
patent: 5555268 (1996-09-01), Fattouche et al.
patent: 5712868 (1998-01-01), Stern et al.

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