Patent ID: 6850553
Filing Date: 2005-02-01
Classification: H04B,H04L

Abstract:
1. In a multiple access chirp radio communication system, a method of discriminating between plural types of mobile transmitters transmitting chirp signals of different slopes within a same frequency range comprising the steps of: (a) encoding data on a series of chirps signals by starting a second chirp and subsequent chirps of the series of chirp signals a=t frequencies different from a nominal frequency by a specific amount, (b) transmitting the series of chirp signals from one of the plural type of mobile transmitters, wherein the series of chirp signals have a slope associated with the respective on of the plural type of transmitters; (c) receiving the chirp signal; (d) detecting the slope of the received chirp signal; and (e) determining mobile transmitter type as a function of the detected chirp slope.