Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Reexamination Certificate
1998-09-09
2001-11-27
Issing, Gregory C. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
C342S357490, C342S357490, C375S150000
Reexamination Certificate
active
06323805
ABSTRACT:
BACKGROUND OF THE INVENTION
I. Field of the Invention
The present invention relates to position location. More particularly, the present invention relates to a novel and improved method and apparatus for performing position location in wireless communications system.
II. Description of the Related Art
Both government regulation and consumer demand have driven the demand for position location functionality in cellular telephones. The global positioning system (GPS) is currently available for performing position location using a GPS receiver in conjunction with a set of earth orbiting satellites. It is therefore desirable to introduce GPS functionality into a cellular telephone.
Cellular telephones, however, are extremely sensitive to cost, weight and power consumption considerations. Thus, simply adding additional circuitry for performing GPS location is an unsatisfactory solution for providing position location functionality in a cellular telephone. Thus, the present invention is directed to providing GPS functionality in a cellular telephone system with a minimum of additional hardware, cost and power consumption.
SUMMARY OF THE INVENTION
The present invention is a novel and improved method and apparatus for performing position location in wireless communications system. One embodiment of the invention comprises a method for performing position location on a subscriber unit in a terrestrial wireless telephone system using a set of satellites each transmitting a signal, the terrestrial wireless telephone system having base stations, including the steps of transmitting an aiding message from the base station to the subscriber unit, said aiding message containing information regarding a data boundary for each signal from the set of satellites, applying correlation codes to each signal yielding corresponding correlation data and accumulating said correlation data over an first interval preceding a corresponding data boundary yielding a first accumulation result, and a second interval following said corresponding data boundary yielding a second accumulation result.
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Understanding GPS Principles and Applications,/ Kaplan, Elliott D.. Boston, MA: Artech House, c1996 Chapters 4 and 5.
Su, Yu T. et al. “Optimal and Suboptimal Noncoherent Detectors for PN Code Acquisition in the Presence of Data Modulation”. IEEE VTC Apr. 1998. pp. 2426-2430.*
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Cheng, Unjeng et al. “Spread Spectrum Code Acquisition in the Presence of Doppler Shift and Data Modulation”. IEEE Trans. on Comm. vol. 38, No. 2. Feb. 1990. pp. 241-250.*
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Kang Inyup
Sih Gilbert C.
Zou Qiuzhen
Brown Charles D.
Greenhalls Bruce W.
Issing Gregory C.
Qualcomm Inc.
Wadsworth Philip
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