| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To estimate the Doppler frequency at a high accuracy without causing any useless process in a radio base station. <P>SOLUTION: A channel estimator 21 estimates the channel on which a pilot signal transmitted from a mobile station 1 is received at a radio base station 2, an inner product value calculator 22 calculates the phase variation value of the channel on the basis of the estimated channel value, an inner product averaging unit 23 averages the calculated phase variation values of the channel within a specified time, a Doppler frequency estimator 24 estimates the Doppler frequency of the mobile station 1 on the basis of the averaged phase variation value of the channel, and an inner product calculation interval calculator 25 calculates the interval of calculating the phase variation value, based on the estimated Doppler frequency. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
