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Abstract

A cell search circuit which does not invite an increase in search time, even if coherent integration is performed, and which minimizes an increase in the scale of the circuitry. The circuit comprises a spread signal generator having a phase shifting function, a multiplier for multiplying an output of the spread signal generator by an input signal, a ring buffer accumulating results of correlation, performed a number of times, in order to perform coherent integration over a plurality of signals, and an accumulator constructed by a single-signal portion of the ring buffer and an adder. Integration is performed over a length of time the same as unit-signal duration prior to spreading, coherent integration is performed by summing results of time integration of each signal, which results have been accumulated in the ring buffer, and the shifting operation of the spread signal generator is controlled based upon results of coherent integration.

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First Claim