Patent ID: 7206333

Claim:
A channel transmission symbol generating system for a multi-carrier communication system, comprising: a user grouping section for dividing users into a plurality of groups, each having a different symbol timing offset; a code spreader for allocating a different orthogonal code to each user, and spreading signals; an interleaver for interleaving a chip signal spread by the code spreader, among data symbols; a serial-to parallel converter for converting the interleaved chip signal into a parallel signal; an inverse fast Fourier transform (IFFT) section coupled to the serial-to-parallel converter to generate a multi-carrier output signal and output the same; a parallel-to serial converter for converting the output signal of the IFFT section in a serial transmission data form; a guard time inserter for inserting a guard time into the output signal of the serial-to-parallel converter; and a symbol timing offset delaying section for delaying the user group signals by predetermined timing offsets to differentiate a symbol timing among the user groups.