Patent ID: 7423961
Filing Date: 2008-09-09
Classification: H04B,H04L

Abstract:
1. A radio apparatus to transmit and receive a signal transmitted with a guard interval section added to each valid symbol section by an orthogonal frequency division communication scheme employing a plurality of carriers, comprising: an array antenna including a plurality of antennas, arrival timing detection means for detecting an arriving timing of a desired wave from signals received by said array antenna, reception response vector estimation means for estimating a first response vector for a signal arriving within said guard interval section from a head arriving wave out of said desired wave, and a second response vector for a signal arriving after said guard interval section from the head arriving wave out of said desired wave, first Fourier transform means for applying Fourier transform on said first and second response vectors to extract components for respective ones of said plurality of carriers, second Fourier transform means for applying Fourier transform on reception signals from said array antenna to extract components for respective carriers of reception signals of respective ones of said antenna, and adaptive array processing means provided for respective ones of said plurality of carriers, each adaptive array processing means receiving a component of a corresponding carrier from said second Fourier transform means among components for carriers of reception signals for respective ones of said antennas for extracting the component of the corresponding carrier in said desired wave, wherein said adaptive array processing means provides a weight vector used to extract said component of the corresponding carrier based components for corresponding carriers of at least said first and second response vectors from said first Fourier transform means.