Patent ID: 6510187
Filing Date: 2003-01-21
Classification: H04B,H04L

Abstract:
A mobile radio terminal having a function of controlling a frequency of a local oscillation signal used to frequency-convert a spread spectrum communication type radio signal to be received into a baseband signal, said terminal comprising:symbol pattern storing means for storing patterns of symbols transmitted to allow a communication terminal to execute transmission diversity; synchronous information detecting means for detecting synchronous information of slots and frames of the signal received from said communication terminal, in said baseband signal; despreading means for despreading said baseband signal; integrating means for integrating a result of the despreading of the despreading means; integration controlling means for controlling said integrating means, to allow said integrating means to integrate the result of despreading of said despreading means corresponding to two successive predetermined periods in which combinations of the symbols are the same, in each of said predetermined periods, in accordance with the synchronous information detected by said synchronous information detecting means and the symbol patterns stored in the symbol pattern storing means; delay means for delaying an output of said integrating means; frequency error detecting means for detecting a frequency error of said local oscillation signal in accordance with a phase difference between a delay output of said delay means and an output of said integrating means; and frequency controlling means for controlling the frequency of said local oscillation signal in accordance with the frequency error detected by said frequency error detecting means.