| 摘要 |
PCT No. PCT/JP96/01589 Sec. 371 Date Feb. 12, 1997 Sec. 102(e) Date Feb. 12, 1997 PCT Filed Jun. 12, 1996 PCT Pub. No. WO96/42147 PCT Pub. Date Dec. 27, 1996In a mobile communication system using spread spectrum, performing respective multiplications of an I and Q channel signals by a spreading code replica, integration over one spreading code period, and square-law detection of the integrated signals to remove data modulation components and residual carrier frequency components. The square-law detected signals are added to obtain signal power over one spreading code period while updating the clock phase of a digital control clock generator. The information of power is stored in a memory in an acquisition mode controller, and the clock phase of the digital control clock generator 30 is fixed at the spreading code replica phase at which a maximum correlation detection power over one spreading code period is obtained. Subsequently, a confirmation mode is started for confirming the spreading code acquisition phase. By thus providing the confirmation mode of the spreading code acquisition, the acquisition can be established in a short time with a low error acquisition probability, thereby enabling a tracking mode to be started soon.
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