Motorola Corporation

Tracie Ann Schirtzinger

Christopher P LaRosa

Michael J Carney

Brian David Storm

Christopher John Becker

Dave Steckl

An apparatus for acquiring a pseudo-random (PN) sequence timing for a code division multiple access (CDMA) radiotelephone. A buffer stores samples of representations of at least one pilot signal. A correlator coupled to the buffer is operable to correlate at least a portion of the samples with a PN sequence at each of a plurality of different PN offsets to produce corresponding correlation energies. A controller coupled to the correlator interrupts the correlator as soon as the PN sequence at a particular PN offset produces a correlation energy at least equal to an energy threshold.

Method and apparatus for acquisition of a spread-spectrum signal

A method of activating a radiotelephone operable in a spread-spectrum multiple access radiotelephone system. A searcher receiver () is activated, and the searcher receiver () acquires a PN sequence timing of a pilot signal. At least one demodulation branch () is activated after activation of the searcher receiver (), and the demodulation branch synchronizes to the PN sequence timing of the selected pilot signal after the searcher receiver () has acquired the PN sequence timing.

Method of and apparatus for activating a spread-spectrum radiotelephone

A digital filter (200) suitable for use in a CDMA or other burst-mode communication device (100) employs precombining of filter coefficients to reduce filter complexity and power dissipation. The digital filter (200) includes a coefficient storage circuit (216) for storing the precombined coefficients, a selection circuit (212) for selecting appropriate precombined coefficients in response to the input signal and a combining circuit (214) for combining the appropriate precombined coefficients to produce a filtered signal.

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Woodstock, IL, United States of America

Tracie Ann Schirtzinger