Patent ID: 6442218
Filing Date: 2002-08-27
Classification: H04L

Abstract:
A demodulator for demodulating data symbols by estimating transmission-line characteristics from received a pilot symbol, comprising:a pilot-based transmission-line-estimation unit for estimating the transmission-line characteristics by using the pilot symbol; a tentative-data-decision unit for tentatively deciding the data symbols based on a transmission-line estimate that is output from said pilot-based transmission-line estimation unit; a data-based transmission-line estimation unit for estimating the transmission-line characteristics by using tentatively decided data output from said tentative-data-decision unit; multiplying units for multiplying the transmission-line estimate output from said pilot-based transmission-line estimation unit and a transmission-line estimate output from said data-based transmission-line estimation unit by respective weights; a pilot&data-based transmission-line estimation unit for obtaining a transmission-line estimate by averaging weighted transmission-line estimates output from said multiplying units; and a final-data decision unit for finally deciding the data symbols by using the transmission-line estimate output from said pilot&data-based transmission-line estimation unit.