Patent ID: 8842748

Claim:
A receiving station in a radio communication system, comprising: a receiving unit that receives a transmission signal that is transmitted from a transmission station wherein the transmission station performs window function processing on a signal to which cyclic prefixes have been attached for each specified number of samples, by multiplying the signal by a window function which weights the signal in the time domain so that the amplitude of the signal is gradually damped, and then transmits the transmission signal obtained by the window function processing to the receiving station; a control signal demodulation unit that demodulates a window width N win of said window function that is transmitted from the transmission station by a control channel wherein the window width indicates time interval during which the amplitude of the transmission signal is damped; a signal extraction position decision unit that decides a position for extracting the effective signal portion from the received signal based on said window width; a signal extraction unit that extracts the effective signal portion from the received signal at said extraction position; and a demodulation unit that uses the extracted effective signal portion to demodulate the transmission signal.