Patent ID: 6980612
Filing Date: 2005-12-27
Classification: H04B,H04L

Abstract:
1. A communication terminal apparatus comprising: a first channel estimator that calculates first channel estimation values, corresponding respectively to a plurality of antennas in a base station apparatus, using a plurality of common known signals that are transmitted from the plurality of antennas, respectively; a phase correction amount calculator that calculates phase correction amounts, based on the first channel estimation values, for use in correction of phase rotations applied to communication channel signals that are transmitted from the plurality of antennas, respectively; a receiver that receives the communication channel signals, to which the phase rotations are applied at the plurality of antennas respectively and transmitted; a phase corrector that phase corrects the received communication channel signals or second channel estimation values, which are calculated from the received communication channel signals, according to the phase correction amounts; a coherent detector that performs coherent detection on a communication channel signal that is subjected to the phase correction by the phase corrector and a communication channel signal that is not subjected to the phase correction by the phase corrector; a communication quality measurer that measures communication quality of a coherent detection result of the communication channel signal that is subjected to the phase correction and communication quality of a coherent detection result of the communication channel signal that is not subjected to the phase correction; and a selector that selects the communication channel signal that presents higher communication quality according to the coherent detection results.