Patent ID: 7002939
Filing Date: 2006-02-21
Classification: H04B,H04L

Abstract:
1. A communication terminal apparatus that performs radio communication with a base station apparatus that transmits from a first antenna and a second antenna common pilot channel signals that are separable, the common pilot channel signal transmitted from the first antenna being accompanied by a dedicated channel signal having a same phase as said common pilot channel signal, the common pilot channel signal transmitted from the second antenna being accompanied by a dedicated channel having a phase rotated from said common pilot channel signal by a candidate phase rotation amount selected from a plurality of candidate phase rotation amounts, the communication terminal apparatus comprising: a first channel estimator that performs channel estimation with respect to the common pilot channel signal from the first antenna and outputs a first estimation value; a second channel estimator that performs channel estimation with respect to the common pilot channel signal from the second antenna and outputs a second estimation value; a third channel estimator that performs channel estimation with respect to the dedicated channel signals from the first and second antennas and outputs a third estimation value; a phase rotation amount estimator that estimates the phase rotation amount selected in the base station apparatus; a channel estimation value synthesizer that synthesizes the first estimation value, a value obtained from the second estimation value by applying the phase rotation amount estimated in the phase rotation amount estimator to said second estimation value, and the third estimation value so as to calculate a definite channel estimation value; and a demodulator that demodulates the dedicated channel signals using the channel estimation value calculated in the channel estimation value synthesizer.