Patent ID: 8284850

Claim:
An OFDM reception apparatus for receiving an orthogonal frequency division multiplexing (hereinafter abbreviated as OFDM) signal including pilot signals which are periodically arranged in a frequency direction and in a time direction and sub-carriers which are arranged in a frequency direction in a known random pattern, in which differential reference signals are periodically inserted in a time direction, and which are differentially modulated and are transmitted, comprising: a Fourier transform unit configured to segment a time-domain signal in the OFDM signal in accordance with a segmenting window signal and convert the time-domain signal into a frequency-domain signal by a Fourier transform; a data demodulation unit configured to demodulate an output from the Fourier transform unit and acquire demodulated data; an error correction unit configured to perforin error correction on an output from the data demodulation unit; a first signal extraction unit configured to extract the pilot signals periodically arranged in the frequency direction and in the time direction from the output from the Fourier transform unit; a second signal extraction unit configured to extract the differential reference signals from the output from the Fourier transform unit; a delay profile detection unit configured to receive an output from the first signal extraction unit and an output from the second signal extraction unit and perform delay profile detection, the delay profile detection unit performing delay profile detection using the output from the second signal extraction unit and performing delay profile detection on the output from the first signal extraction unit within a range limited on the basis of a result of the detection; and a synchronous reproduction unit configured to generate the segmenting window signal using an output from the delay profile detection unit.