Patent ID: 8259654

Claim:
A wireless base station apparatus comprising: a path detecting unit configured to detect a preamble signal sent from a terminal and obtain a back-diffusion timing; a back-diffusion unit configured to execute back-diffusion processing on a message signal sent from the terminal, by using the back-diffusion timing reported from the path detecting unit; and a calculating unit configured to calculate a frequency deviation of the message signal that has been subjected to the back-diffusion processing, based on a pilot signal of the message signal that has been subjected to the back-diffusion processing, wherein the path detecting unit comprises an initial value information detecting unit configured to detect a frequency deviation of the preamble signal when the preamble signal is detected and supply the frequency deviation of the preamble signal to the calculating unit as initial value information, and the calculating unit comprises an initial value information adding unit that calculates the frequency deviation of the message signal by using the initial value information.