Active waveform collection for use in transmitter identification

Details Active waveform collection for use in transmitter identification Active waveform collection for use in transmitter identification

1996-06-27

2000-03-07

Chin, Wellington

Telecommunications

Radiotelephone system

Security or fraud prevention

455411, 455408, 455410, H04Q 720

Patent

active

060351888

ABSTRACT:
A method and system for actively and rapidly collecting reference waveforms from a large number of cellular telephones is provided. The reference waveforms are used to generate fingerprints which are used to distinguish between authorized cellular telephones and unauthorized cellular telephones. Initially, the system selects a cellular telephone whose reference waveform is desired. The selected cellular telephone is then sent a polling message such as a page or registration request. The cellular telephone receives the polling message and transmits a radio frequency (RF) signal containing a reference waveform that contains certain transmission characteristics unique to the selected cellular telephone. From the received RF signal, the reference waveform is extracted and stored. Preferably, the selected cellular telephone is polled repeatedly in order to receive a sufficiently large number of reference waveforms to be able to generate an accurate fingerprint. One method of polling the cellular telephone is by calling the selected cellular telephone through a cellular telephone system. Another method of polling the cellular telephone is by transmitting a control message such as a page, registration, audit or maintenance message.

REFERENCES:
patent: 5005210 (1991-04-01), Ferrell
patent: 5315636 (1994-05-01), Patel
patent: 5329591 (1994-07-01), Magrill
patent: 5420910 (1995-05-01), Rudokas et al.
patent: 5448760 (1995-09-01), Frederick
patent: 5535431 (1996-07-01), Grube et al.
patent: 5555192 (1996-09-01), Grube et al.
patent: 5555551 (1996-09-01), Rudokas et al.
patent: 5625869 (1997-04-01), Nagamatsu et al.
patent: 5633914 (1997-05-01), Rosa
patent: 5655004 (1997-08-01), Holbrook

Affiliated with

Also associated with

Rating

Active waveform collection for use in transmitter identification does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Active waveform collection for use in transmitter identification, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active waveform collection for use in transmitter identification will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-371702