Patent ID: 6658046
Filing Date: 2003-12-02
Classification: H04B

Abstract:
A spread spectrum receiver comprising:a plurality of rake fingers for receiving a spread spectrum signal, each rake finger including despreading circuitry for despreading the spread spectrum signal with a despreading code of an identical bit sequence; a rake combiner for combining output signals of said rake fingers; and control circuitry for setting despreading codes of a first bit sequence to said rake fingers at respective timing offsets in incremental values so that there is a timing difference of one chip interval between successive rake fingers, and successively varying said respective timing offsets to receive a call processing signal, said control circuitry being responsive to an output of said rake combiner, indicating that said call processing signal is received, for determining a timing offset of the received call processing signal, and setting despreading codes of a second bit sequence to said rake fingers at respective timing offsets of said incremental values based on the determined timing offset to receive an information signal; and wherein said control circuitry is arranged to successively vary the respective timing offsets of the despreading codes of the second bit sequence in response to an output of said rake combiner indicating that said information signal is lost.