Apparatus and method for transmitting and receiving side information of a partial transmit sequence in an OFDM communication system

1. 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.

2. The transmission apparatus of claim 1 , wherein the phase value of the reference symbol is set to 0°.

3. The transmission apparatus of claim 1 , wherein the phase value of the reference symbol is alternately set to 0° and 180° according to the sub-blocks.

4. The transmission apparatus of claim 1 , wherein the phase value of the reference symbol is sequentially set to 0°, 90°, 180°, and 270° according to the sub-blocks.

5. The transmission apparatus of claim 1 , wherein the reference symbol has a complementary sequence phase according to the sub-blocks.

6. The transmission apparatus of claim 1 , wherein the reference symbol has a Walsh sequence phase according to the sub-blocks.

7. The transmission apparatus of claim 1 , further comprising a phase factor determiner for determining phase factors of the IFFT-transformed time-based signals to reduce a peak-to-average power ratio (PAPR) where non-linear distortion occurs due to coincidence of phases of data blocks IFFT-transformed with the sub-carrier frequencies.

8. The transmission apparatus of claim 1 , wherein the size of the reference symbol is 1.

9. The transmission apparatus of claim 1 , wherein the reference symbol is inserted into a predetermined position.

10. A transmission method for an orthogonal frequency division multiplexing (OFDM) communication system that multiplexes data with at least one orthogonal sub-carrier frequency, the method comprising the steps of:

converting a serial data stream into parallel data;

segmenting the parallel data into a plurality of blocks having a plurality of data blocks;

inserting reference data having information comprising a predetermined phase value and size, into each of the segmented blocks;

Inverse Fast Fourier Transform (IFFT)-transforming the respective blocks into time-based signals where sub-carrier frequencies are separately assigned to the data blocks;

determining phase factors of the IFFT-transformed time-based signals to reduce a Peak-to-Average Power Ratio (PAPR) where non-linear distortion occurs due to coincidence of phases of the data blocks IFFT-transformed with the sub-carrier frequencies; and

phase-rotating the IFFT-transformed signals according to the determined phase factors before transmission.

11. The transmission method of claim 10 , wherein the phase value is set to 0°.

12. The transmission method of claim 10 , wherein the phase value is alternatively set to 0° or 180° according to the blocks.

13. The transmission method of claim 10 , wherein the phase value is sequentially set to 0°, 90°, 180°, and 270° according to the blocks.

14. The transmission method of claim 10 , wherein the phase value has a complementary sequence phase according to the blocks.

15. The transmission method of claim 10 , wherein the size of the reference symbol is 1.

16. The transmission method of claim 10 , wherein the reference symbol is inserted into a predetermined position.

17. The transmission method of claim 10 , wherein the phase value has a Walsh sequence phase according to the blocks.

18. A transmission method for an orthogonal frequency division multiplexing (OFDM) communication system that multiplexes data with a plurality of orthogonal sub-carriers, comprising the steps of converting a serial data stream into parallel data, segmenting the parallel data into at least one blocks having a plurality of data blocks, Inverse Fast Fourier Transform (IFFT)-transforming the blocks into time-based signals where sub-carrier frequencies are separately assigned to the data blocks, determining phase factors of the IFFT-transformed time-based signals to reduce a Peak-to-Average Power Ratio (PAPR) where non-linear distortion occurs due to coincidence of phases of the data blocks IFFT-transformed with the sub-carrier frequencies, and phase-rotating the IFFT-transformed signals according to the determined phase factors before transmission;

wherein reference data having information comprising a predetermined phase value and size into which the reference data is inserted is inserted into each sub-block between the segmentation step and the IFFT transforming step.

19. The transmission method of claim 18 , wherein the phase value is set to 0°.

20. The transmission method of claim 18 , wherein the phase value is alternately set to 0° and 180° according to the blocks.

21. The transmission method of claim 18 , wherein the phase value is sequentially set to 0°, 90°, 180°, and 270° according to the blocks.

22. The transmission method of claim 18 , wherein the phase value is set to have a complementary sequence phase according to the blocks.