Patent ID: 6490265
Filing Date: 2002-12-03
Classification: H04B

Abstract:
A CDMA receiver comprising:despreading means which produces a first despread pilot signal by despreading at a first timing a pilot signal included in a received signal, produces a second despread pilot signal by despreading the pilot signal at a second timing earlier than the first timing by a given period of time, and produces a third despread pilot signal by despreading the pilot signal at third timing later than the first timing by a given period of time; first strength determination means which produces a first received pilot signal strength from the first despread pilot signal; second strength determination means which produces a second received pilot signal strength from the second despread pilot signal and a third received pilot signal strength from the third despread pilot signal; strength difference detection means for detecting a difference between the second received pilot signal strength and the third received pilot signal strength; integration means which accumulates the strength difference and outputs a received strength difference sum; integration control means which determines an integration interval from the first received pilot signal strength; an ON/OFF switch for activating or deactivating the integration means according to the integration interval; and phase tracking control means for adjusting the phase of the first timing on the basis of the received strength difference sum.