Patent ID: 6977955
Filing Date: 2005-12-20
Classification: H04B

Abstract:
1. A demodulation circuit for CDMA mobile communications, including: a calculation portion for calculating a delay profile, which indicates a signal power distribution with respect to signal delay time, based on received signals upon receiving I-component and Q-component signals as outputs of orthogonal detection; and a path search portion for selecting paths with a large signal power from the delay profile calculated by said calculation portion to assign it to a finger portion, wherein the path search portion comprises: a path comparison portion for determining whether one and the same path is detected successively or not; a detection portion for detecting the variation between currently detected path and previously detected path when the path comparison portion determined that one and the same path has been detected successively; and a path replacement control portion for excluding a path with a maximum variation from the finger portion and assigning a new path to the finger portion if the variation of said path with the maximum variation within the paths already assigned to the finger portion by the detection portion, has the variation larger than/equal to a predetermined variation threshold when said new path, which is not assigned to the finger portion and has a power level higher than/equal to a predetermined assignment threshold, is detected.