Patent ID: 8406322
Filing Date: 2013-03-26
Classification: H04L

Abstract:
1. An orthogonal frequency division multiplexed (OFDM) demodulation device for demodulating an OFDM signal, the OFDM demodulation device comprising: quadrature demodulating means that carries out quadrature demodulation of the OFDM signal by using a carrier signal having a specific frequency to thereby produce a baseband OFDM signal; carrier frequency offset detecting means that detects a carrier frequency offset amount that is a shift amount of a center frequency of the baseband OFDM signal with subcarrier accuracy, based on correlation of subcarriers to which a predetermined signal is inserted, of a frequency-domain OFDM signal, between the transmission symbols; and frequency control means that controls a frequency of the carrier signal depending on the carrier frequency offset amount, wherein for a plurality of assumed offset amounts, the carrier frequency offset detecting means divides subcarriers at positions at which the predetermined signal is inserted when each assumed offset amount is assumed into a plurality of groups, and calculates a correlation value with respect to an adjacent transmission symbol for each of the groups for the corresponding assumed offset amount, and the carrier frequency offset detecting means adds the correlation values of the respective groups to each other to obtain an addition-result value for each offset amount, and defines the assumed offset amount associated with a maximum addition-result value the carrier frequency offset amount.