Patent ID: 6952394

Claim:
A method for transmitting orthogonal frequency division multiplexing (OFDM) signals, the method comprising: (a) coding the OFDM signals; (b) forming a block of N coded data and dividing the block into L M-sized small blocks, where N, M and L indicate integers of 1 or more, and L=N/M, the N coded data forming the one block being expressed by X n , where n=0,1, . . . ,N−1, each of the L small blocks X v l , where l=0,1, . . . ,L−1, being divided based on the relationship X v l =X lM+v =X n ,n=lM+v,l=0,1, . . . ,L−1,v=0,1, . . . ,M−1; (c) M-point inverse fast Fourier transforming the L small blocks; (d) combining L M-point inverse fast Fourier transformed blocks, and generating an N-sized inversely-transformed block; (e) attaching a cyclic prefix to the N-sized inversely-transformed block; and (f) transforming the blocks having the attached cyclic prefix, into an analog signal and transmitting the transformed analog signal.