Patent ID: 7376074

Claim:
A transmission apparatus for an orthogonal frequency division multiplexing (OFDM) communication system that multiplexes data with a plurality of orthogonal sub-carriers, the apparatus comprising: a sub-block segmentation unit for segmenting parallel data generated by parallel-converting a serial data stream, into a plurality of sub-blocks having at least one data block; a reference symbol inserter for inserting a reference symbol having information comprising a predetermined phase value and size, into each of the segmented sub-blocks; a plurality of Inverse Fast Fourier Transform (IFFT) units for independently IFFT-transforming the sub-blocks into time-base signals where sub-carrier frequencies are separately assigned to the data blocks; a plurality of multipliers for separately multiplying the IFFT-transformed signals by predetermined associated phase factors; and a combiner for combining outputs of the multipliers and transmitting the combined result.