Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
1998-09-09
2001-11-27
Chin, Stephen (Department: 2634)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C342S357490, C342S357490, C701S213000
Reexamination Certificate
active
06324227
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 including the steps of receiving signal samples, generating a coarse acquisition sequence, rotating said coarse acquisition sequence yielding a rotated coarse acquisition sequence, and applying said rotated coarse acquisition sequence to said signal samples at a set of time offsets yielding correlated output data.
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Kang Inyup
Sih Gilbert C.
Zou Qiuzhen
Brolon Charles D.
Chin Stephen
Greenhaus Bruce W.
Jiang Lenny
Qualcomm Incorporated
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