Patent ID: 7647073
Filing Date: 2010-01-12
Classification: H04L

Abstract:
1. A channel estimation apparatus in a broadband wireless communications system using a smart antenna in which a data area comprises pilot tones and data tones, comprising: a Fast Fourier Transform (FFT) processor for converting a received time-domain signal into a frequency-domain signal by FFT-processing the received time-domain signal; a channel acquirer for estimating a first channel information for a space division multiple access (SDMA) user using a preamble signal allocated to the SDMA user in the frequency-domain signal; a channel tracker for estimating a second channel information for the SDMA user using pilots in a data area allocated to the SDMA user in the frequency-domain signal; and a channel estimator for estimating a final channel information by weighting the first channel information and the second channel information according to a channel change rate.