Transmitter modulation switching

Details Transmitter modulation switching Transmitter modulation switching

2008-05-06

2008-05-06

La, Anh V. (Department: 2612)

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

C340S005610, C340S005720, C340S010200, C307S010200

Reexamination Certificate

active

07369040

ABSTRACT:
An example receiver/transmitter for a passive start and entry system switches between amplitude shift keyed modulation and frequency shift keyed modulation to maintain clear uninterrupted and dependable communication with a remote transmitter in the presence of interfering signals. The receiver/transmitter is switched to receive incoming FSK signals in response to the RSSI becoming saturated by undesired signals. The switch to FSK signal modulation occurs by signaling the remote transmitter to change over and begin sending FSK modulated signals. The FSK modulated signals are then received without significant interference.

REFERENCES:
patent: 6420967 (2002-07-01), Ghabra et al.
patent: 2005/0003781 (2005-01-01), Kunz et al.
patent: 2005/0190859 (2005-09-01), Brandwein
patent: 2005/0232376 (2005-10-01), Liem et al.

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