| 摘要 |
<p>In a clock frequency controller for CDMA mobile communication terminal, an AFC control section (1) controls the clock frequency by providing a clock signal generating section with a signal corresponding to the time error between a normal reference timing and a reference timing detected based on correlation operation through a matched filter at the time of initial pull-in of the clock frequency after the power switch is turned on or after the mobile station returns to the zone from the outside, (2) controls the clock frequency to agree with a reference clock frequency by operating the phase difference of the rotational angle on the I-jQ plane of a specified symbol contained periodically in the downlink signal from a base station upon finishing initial pull-in of the clock frequency and inputting a phase difference signal to the clock signal generating section, (3) controls the clock frequency so that an average value of DLL correlation value becomes zero when the required accuracy of the clock signal agrees with that of the reference clock frequency by bringing the phase difference signal to zero and inputting the average signal to the clock signal generating section.</p> |
