Patent ID: 7724804

Claim:
A receiving apparatus that receives an Orthogonal Frequency Division Multiplexing (OFDM) signal, including an OFDM symbol, subject to frequency hopping on multiple bands, the OFDM symbol, which functions as a channel estimation sequence, being transmitted multiple times at hopping intervals in a time division manner on each of the bands, the apparatus comprising: receiving means for receiving the OFDM signal transmitted on a channel; Fourier transform means for transforming the OFDM signal into signals of sub-carriers; channel correcting means for estimating a channel characteristic by using the OFDM symbol functioning as a channel estimation sequence resulting from the transforming into sub-carrier signals and performing channel correction thereon; and decoding means for performing symbol identification and decoding on the channel-corrected data signal back to the original data signal, wherein the channel correcting means: obtains, for each of the bands, a frequency error between the OFDM symbols for channel estimation, which are transmitted at hopping intervals, adds and averages the frequency errors obtained for the bands and normalizes the result by the center frequencies of the bands; on each of the bands, multiplies the normalized frequency error by each of the sub-carriers of the OFDM symbol back to the angle of phase rotation of each of the sub-carriers, integer-multiplies the phase rotation information of each of the sub-carriers by the symbol difference between OFDM symbols transmitted at hopping intervals, corrects the amount of phase rotation with respect to the channel estimation values of the OFDM symbols based on the integer-multiplied phase rotation information, which results in the agreement of the phases of the channel estimation values from the OFDM symbols on one band; and averages, thereafter, the channel estimation values of the OFDM symbols on the bands in a time domain.