Patent ID: 8023400

Claim:
A method for transmitting a signal by a signal transmission apparatus in a Double Orthogonal Frequency Division Multiplexing (DOFDM)/Double Orthogonal Frequency Division Multiple Access (DOFDMA) communication system, the method comprising: performing M-point Inverse Discrete Fourier Transform (M-IDFT) on M sub-samples for each of N sub-carriers; generating a first signal by inserting a Cyclic Prefix (CP) with a first length into the M-IDFT-processed signal; performing N-point IDFT (N-IDFT) on the first signal generated for each of the N sub-carriers; parallel-to-serial converting the N-IDFT-processed signal; generating a second signal by inserting a CP with a second length into the parallel-to-serial converted signal; and transmitting the second signal to a signal reception apparatus, wherein N denotes a number of sub-carriers used in the DOFDM/DOFDMA communication system, and M denotes an integer greater than or equal to 1.