Lucent Technologies Inc.

Christopher Burke Barroso

Giovanni Vannucci

Byron H Chen

Disclosed is a method for deriving accurate global positioning satellite (GPS) timing by calibrating frame boundaries to GPS timing. Time calibration is achieved by determining a time difference &#x394;t between a reference GPS time (or pulse) and an nth frame boundary. The time difference &#x394;t and a frame boundary identifier specifying the nth frame boundary are provided to a device equipped with a full or partial GPS receiver so that the GPS equipped device may synchronize itself to GPS timing. Upon synchronizing itself to GPS timing, the GPS equipped device may search for GPS signals using information provided by a geographical location server, e.g., WAG server.

Method of timing calibration

A solution to a problem of false positives in frame synchronization in telecommunication systems involves generating a separate channel estimate based only on the non-SW (all &minus;1) bits of a pilot sequence. This non-SW channel estimate is used to correct received pilot SW symbols. These specially corrected symbols are rake combined separately from other symbols. The result is used exclusively for the frame synchronization detector. Normal channel estimate calculations and rake combining proceeds as usual. This method of frame synchronization only refers to SW bit matches. False positives are decreased using the invention.

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New York, NY, United States of America

Christopher Burke Barroso