OFDM signal receiver device and OFDM signal receiving method

An OFDM signal receiver device comprising:

• an interpolation filter for calculating a transmission channel characteristic corresponding to a subcarrier component which is contained in a received OFDM signal based on said transmission channel characteristic calculated based on a pilot signal in said subcarrier component and a known signal;
• a noise power-calculating unit for calculating an electric power corresponding to a noise component which is contained said received OFDM signal;
• and
• a weighting factor-calculating unit for calculating a weighting factor for a branch metric based on said transmission channel characteristic calculated by said interpolation filter and said electric power calculated by said noise power-calculating unit.

An OFDM signal receiving method, comprising:

• performing a Fourier transform on a received OFDM signal to output a subcarrier component as a result of said Fourier transform;
• extracting a pilot signal contained in said subcarrier component;
• generating and outputting a known signal corresponding to said pilot signal;
• dividing said pilot signal by said known signal to calculate a transmission channel characteristic corresponding to said pilot signal;
• calculating a transmission channel characteristic corresponding to said subcarrier component based on said transmission channel characteristic of said pilot signal;
• dividing said subcarrier component by said transmission channel characteristic corresponding to said subcarrier component to output a demodulated signal;
• calculating 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;
• calculating a weighting factor for a branch metric based on said transmission channel characteristic corresponding to said subcarrier component and said noise power signal;
• and
• decoding said demodulated signal based on said weighting factor.

An OFDM signal receiving method, comprising:

• calculating a transmission channel characteristic corresponding to a subcarrier component which is contained in a received OFDM signal based on said transmission channel characteristic calculated based on a pilot signal in said subcarrier component and a known signal;
• calculating an electric power corresponding to a noise component which is contained said received OFDM;
• and
• calculating a weighting factor for a branch metric based on said transmission channel characteristic and said electric power.