Patent ID: 7583737
Filing Date: 2009-09-01
Classification: H03M,H04L

Abstract:
1. An OFDM signal receiver device comprising: a Fourier transform unit for performing a Fourier transform on a received OFDM signal and outputting a subcarrier component obtained as a result of said Fourier transform; a pilot extracting unit for extracting a pilot signal contained in said subcarrier component; a known signal generating unit for generating and outputting a known signal corresponding to said pilot signal; a first divider unit for dividing said pilot signal by said known signal and outputting a transmission channel characteristic corresponding to said pilot signal; an interpolation filter unit for calculating a transmission channel characteristic corresponding to said subcarrier component based on said transmission channel characteristic corresponding to said pilot signal; a second divider unit for dividing said subcarrier component output from said Fourier transform unit by said transmission channel characteristic output from said interpolation filter unit to output a demodulated signal; a noise power-calculating unit for calculating an electric power corresponding to a noise component contained in said demodulated signal based on said demodulated signal and outputting a noise power signal corresponding to a result of said calculation; a weighting factor-calculating unit for calculating a weighting factor for a branch metric based on said noise power signal and said transmission channel characteristic corresponding to said subcarrier component that is output from said interpolation filter unit; and a decoding unit for decoding said demodulated signal based on said weighting factor.