Cellular telephone anti-fraud system

Details Cellular telephone anti-fraud system Cellular telephone anti-fraud system

1993-06-08

1995-09-05

Urban, Edward F.

Telecommunications

Transmitter and receiver at separate stations

Single message via plural carrier wave transmission

455 542, 455 331, 455 671, 380 23, 379 62, H04B 700

Patent

active

054487609

ABSTRACT:
Authorized use of a wireless subscriber system, e.g. cellular telephone system, is distinguished from unauthorized use by electronically observing a plurality of external signal traits which represent alterations in the radio frequency signal due to physical characteristics identified with a particular transmitter. Examples of such external signal traits include those which are produced as a consequence of manipulating the carrier to encode information upon it and those produced by transmitter timing circuit idiosyncrasies. The external signal traits are converted into a signature code or security pattern which is then stored along with the existing subscriber system identification code to generate a historic security pattern database for use in subsequent authorized use validation.

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