Patent ID: 7822007

Claim:
A transmitter in a frequency division multiple access communication system, the transmitter comprising: a pilot controller for generating a plurality of pilot symbols, and grouping the pilot symbols into a plurality of groups according to a location of a subcarrier; an inverse fast Fourier transform unit for inverse fast Fourier transforming the pilot symbols in each group, and sequentially outputting a first pilot symbol sequence corresponding to each group; and a parallel/serial converter for generating a plurality of pilot blocks respectively corresponding to the groups, and converting the first pilot symbol sequence of each group into a second pilot symbol sequence of a corresponding pilot block among the pilot blocks, wherein the pilot symbol generator allocates pilot symbols of subcarriers, the subcarriers having the same remainder when the location of the subcarrier is divided by a predetermined integer, to the same group, and wherein the predetermined integer corresponds to a ratio of a length of a data/control block output from the parallel/serial converter and a length of the pilot block.