Method of demodulating chirp spread spectrum

Details Method of demodulating chirp spread spectrum Method of demodulating chirp spread spectrum

1995-05-25

1998-05-05

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

342132, 324 7612, H04B 1500, H04K 100, H04L 2730

Patent

active

057486700

ABSTRACT:
A digital circuit is used to demodulate a linear chirp spread spectrum signal. The digital circuit uses a counter which is clocked so as to count during the time period between the pulses of a chirp signal. The circuitry also uses a digital filter to determine whether the frequencies of the linear chirp signal are within the correct bandwidth. The output of the counter is compared with the previous count to produce a difference count. A processor uses this difference count value to determine the characteristics of a chirp signal being decoded. A difference signal test circuit provides a digital filter for the difference count to eliminate spurious noise conditions.

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