| 摘要 |
PROBLEM TO BE SOLVED: To immediately detect that a mobile station has moved by reading two phases of spread codes generating maximum amplitudes stored in a sorter in the decreasing order of amplitudes, detecting the maximum amplitude of a multiplication result, and entering an operation state. SOLUTION: A correlation receiver receives a spread input signal Din and starts sliding correlation operation while shifting the phases of spread codes under the control of a control part 10. A 1st inverse spread part 1 shifts the phases of the spread codes to perform sliding correlation operation. A phase difference setting part 8 stores the phase difference right before a sleep state in entered. A 2nd reverse spread part 2, therefore, acquires a correlation accumulation signal. Synchronism establishment data right before the sleep state can be utilized by providing the phase difference setting part 8. The synchronism acquisition of the 2nd inverse spread part 2 is completed at the same time only by performing the synchronism acquisition of the 1st inverse spread part 1 and the synchronism establishment time is shortened to a half. |
