Apparatus and method for tracking a phase of a pseudo-random...

Details Apparatus and method for tracking a phase of a pseudo-random... Apparatus and method for tracking a phase of a pseudo-random...

2007-10-02

2007-10-02

Gesesse, Tilahun (Department: 2618)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C370S519000, C375S141000

Reexamination Certificate

active

10657698

ABSTRACT:
An apparatus and method are disclosed for acquiring by a mobile terminal a pseudo-random noise (PN) sequence of a pilot signal received from a base station by means of a searcher, designating a phase of the acquired PN sequence as a reference phase to track the phase of the acquired PN sequence, and measuring an energy difference between an early path and a late path for the reference phase in a mobile communication system. In the apparatus and method, a first energy measurer measures a first energy value from a PN sequence with the reference phase, and a second energy measurer alternately measures energy values of the early path and the late path for the reference phase and outputs a second energy value. A first normalizer normalizes the first energy value with the second energy value, and a delay processor delays the normalized energy value for a predetermined time; a subtractor calculates a difference between the normalized energy value output from the first normalizer and the energy value output from the delay processor.

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