Patent Number: 7,826,343

Title: Position location signaling method apparatus and system utilizing orthogonal frequency division multiplexing

Abstract: Position location signaling system, apparatus, and method are disclosed. Position location beacons can each be configured to transmit a frequency interlaced subset of orthogonal frequencies spanning substantially an entire channel bandwidth. The orthogonal frequencies can be pseudorandomly or uniformly spaced, and each beacon can be allocated an equal number of orthogonal frequencies. Each frequency of the interlaced subset of orthogonal frequencies can be modulated with an element of a predetermined data sequence. A mobile device can receive one or more of the beacon signals and determine a position using a position location algorithm that determines position in part on an arrival time of the beacon signal. Where the mobile device can receive three or more beacon signals, the mobile device can perform position location by trilateration to the beacon positions based, for example, on a time difference of arrival.

Inventors: Krasner; Norman F. (Emerald Hills, CA)

Assignee: QUALCOMM Incorporated

International Classification: H04J 11/00 (20060101)

Expiration Date: 2019-11-02 0:00:00