Patent · US Active

Detection of time of arrival of CDMA signals in a wireless location system

US7667649B2 · kind B2 · utility

9Cited by

9References

46Claims

0Family size

Assignee

TruePosition, Inc. · US

Inventors

Ronald LeFever · Lansdale, US
Rashidus S. Mia · Phoenixville, US
Robert J. Anderson · Phoenixville, US

Key dates

Filing date	Dec 10, 2007
Grant date	Feb 23, 2010
Priority date	—
Expiry date	Jul 17, 2028

Classification

Technology area (CPC H)Electricity
CPC primaryH04B17/391
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

In a Wireless Location System (WLS) deployed in connection with a CDMA-based wireless communications system, Location Measurement Units are used to collect multi-path corrupted radio signaling for use in time difference of arrival (TDOA) and hybrid positioning methods. Signal processing techniques are used to enhance the WLS's ability to determine the minimally time-delayed multi-path component and thus increase the accuracy of the TDOA location in CDMA-based wireless communications systems. The signal processing includes a filtering technique for reducing the leading sidelobes of the cross-correlation function as well as a leading edge discovery procedure.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.