Patent ID: 7450651

Claim:
A multi-carrier transmission system comprising: a transmitter including: an acquisition unit configured to acquire 2 m (m: a natural number) modulated signals including 2 n (n: a natural number; n<m) no-information signals which are failed to be used for information transmission, the acquisition unit subjecting the modulated signals to inverse discrete Fourier transform to obtain a plurality of transformed signals, an L th modulated signal of the modulated signals being a first no-information signal of the no-information signals, every K th modulated signal of the modulated signals that is counted from the first no-information signal being a subsequent no-information signal of the no-information signals (K: a natural number; L: an integer; K=2 m−n ; 0≦L≦K−1); and a transmission unit configured to transmit the transformed signals; and a receiver including: a receiving unit configured to receive the transformed signals; and a detection unit configured to detect synchronization timing by extracting a sequence of time-based signals of the received signals to establish a relation between the received signals, the relation being determined by positions of the no-information signals included in the transformed signals.