Patent ID: 8446814

Claim:
A radio communication system having a plurality of radio communication devices that transmit and receive subframes one by one, each of said plurality of radio communication devices comprising: a subframe generation unit that generates a subframe with a plurality of symbols and causes an effective symbol length of a last symbol of said subframe to be 1/X (where X is an integer equal to or greater than 2); and a transmission unit that transmits said subframe to another radio communication device, wherein said subframe generation unit comprises: a data insertion unit that generates a frequency domain signal such that data are placed on nY-th (where n is 1, 2, 3, . . . ; Y is an integer equal to or greater than 1) subcarriers; an IFFT unit that transforms said frequency domain signal into a time domain signal using inverse fast Fourier transform; a CP addition unit that generates symbols such that said time domain signal is divided by division number Y and cyclic prefixes are added to divided first time domain signals; and a first coefficient control unit that controls said Y to be said X or 1.