Pulse or digital communications – Spread spectrum – Chirp
Reexamination Certificate
2006-06-27
2006-06-27
Patel, Jay K. (Department: 2637)
Pulse or digital communications
Spread spectrum
Chirp
C375S343000, C455S404200
Reexamination Certificate
active
07068704
ABSTRACT:
Systems and methods are described here for locating the position of a mobile terminal in a cellular communications system. A base station in the cellular communication system broadcasts a communication signal having embedded therein a navigation signal. The navigation signal uses a chirp technique in which the chirp signal includes two portions, an up-chirp portion and a down-chirp portion. Each portion of the chirp signal is synchronized with a frame in the communication signal. The chirp navigation signal is at a power level much lower than the communication signal so as not to interfere with the communication signal. A mobile terminal generates a corresponding chirp signal to correlate with the incoming signal and to extract the navigation signal. The mobile terminal uses the detected navigation signal to determine a time of arrival of the communication signal for use in determining the position of the mobile terminal either at the terminal or to send to a network center for location processing.
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Edell Shapiro & Finnan LLC
ITT Manufacturing Enterpprises, Inc.
Lugo David B.
Patel Jay K.
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