Method and device for transmitting data in wireless communication system

1. A method, performed by a transmission apparatus, of transmitting data in a wireless communication system, the method comprising:

performing π/2-binary phase shift keying (BPSK) modulation on M symbols;

performing a discrete Fourier transform (DFT) on the M symbols on which the π/2-BPSK modulation has been performed;

identifying M/2 symbols among the M symbols on which the DFT has been performed, wherein the M symbols on which the DFT has been performed are symmetric and information of the identified M/2 symbols is same with information of remaining M/2 symbols among the M symbols on which the DFT has been performed; wherein M is an integer greater than or equal to 1;

performing an inverse fast Fourier transform (IFFT) on the M/2 symbols identified among the M symbols on which the DFT has been performed; and

transmitting, to a reception apparatus, the M/2 symbols on which the IFFT has been performed,

wherein a constellation of the M symbols on which the π/2-BPSK modulation has been performed has only real components or imaginary components.

2. The method of claim 1 , wherein the M/2 symbols are transmitted by using transmission power for transmitting the M symbols.

3. The method of claim 1 ,

wherein the transmission apparatus is a base station and the reception apparatus is a terminal,

wherein the method further comprises transmitting downlink control information (DCI) to the terminal, and

wherein the DCI comprises information that the π/2-BPSK modulation is performed on symbols and half of the symbols on which the π/2-BPSK modulation has been performed are transmitted to the terminal.

4. The method of claim 1 ,

wherein the transmission apparatus is a terminal and the reception apparatus is a base station,

wherein the method further comprises receiving DCI from the base station, and

wherein the DCI comprises information indicating that the π/2-BPSK modulation is to be performed on symbols and half of the symbols on which the π/2-BPSK modulation has been performed are to be transmitted to the base station.

5. A method, performed by a reception apparatus, of receiving data in a wireless communication system, the method comprising:

receiving M/2 symbols from a transmission apparatus;

performing a fast Fourier transform (FFT) on the M/2 symbols;

obtaining M symbols including the M/2 symbols on which the FFT has been performed, and M/2 symbols obtained by copying the M/2 symbols on which the FFT has been performed, wherein the M symbols are symmetric and information of the M/2 symbols on which the FFT has been performed is same with information of copied M/2 symbols; wherein M is an integer greater than equal to 1; and

performing an inverse discrete Fourier transform (IDFT) on the M symbols;

wherein the M/2 symbols received from the transmission apparatus are symbols on which π/2-binary phase shift keying (BPSK) modulation has been performed at the transmission apparatus, and

wherein a constellation of the M/2 symbols on which the FFT has been performed has only real components or imaginary components according to the π/2-BPSK modulation.

6. The method of claim 5 , wherein the M/2 symbols received from the transmission apparatus are transmitted by using transmission power for transmitting the M symbols.

7. The method of claim 5 ,

wherein the reception apparatus is a terminal and the transmission apparatus is a base station,

wherein the method further comprises receiving downlink control information (DCI) from the base station, and

wherein the DCI comprises information that the π/2-BPSK modulation is performed on symbols and half of the symbols on which the π/2-BPSK modulation has been performed are transmitted to the terminal.

8. The method of claim 5 ,

wherein the reception apparatus is a base station and the transmission apparatus is a terminal,

wherein the method further comprises transmitting DCI to the terminal, and

wherein the DCI comprises information indicating that the π/2-BPSK modulation is to be performed on symbols and half of the symbols on which the π/2-BPSK modulation has been performed are to be transmitted to the base station.

9. A transmission apparatus for transmitting data in a wireless communication system, the transmission apparatus comprising:

a transceiver; and

at least one processor connected to the transceiver and configured to:

perform π/2-binary phase shift keying (BPSK) modulation on M symbols,

perform a discrete Fourier transform (DFT) on the M symbols on which the π/2-BPSK modulation has been performed, wherein M is integer greater than or equal to 1,

identify M/2 symbols among the M symbols on which the DFT has been performed, wherein the M symbols on which the DFT has been performed are symmetric and information of the identified M/2 symbols is same with information of remaining M/2 symbols among the M symbols on which the DFT has been performed,

perform an inverse fast Fourier transform (IFFT) on the M/2 symbols identified among the M symbols on which the DFT has been performed, and transmit,

to a reception apparatus, the M/2 symbols on which the IFFT has been performed,

wherein a constellation of the M symbols on which the π/2-BPSK modulation has been performed has only real components or imaginary components.

10. The transmission apparatus of claim 9 , wherein the M/2 symbols are transmitted by using transmission power for transmitting the M symbols.

11. The transmission apparatus of claim 9 ,

wherein the transmission apparatus is a base station and the reception apparatus is a terminal,

wherein the at least one processor is configured to:

transmit downlink control information (DCI) to the terminal, and

wherein the DCI comprises information that the π/2-BPSK modulation is performed on symbols and half of the symbols on which the π/2-BPSK modulation has been performed are transmitted to the terminal.

12. The transmission apparatus of claim 9 ,

wherein the transmission apparatus is a terminal and the reception apparatus is a base station,

wherein the at least one processor is configured to:

receive DCI from the base station, and

wherein the DCI comprises information indicating that the π/2-BPSK modulation is to be performed on symbols and half of the symbols on which the π/2-BPSK modulation has been performed are to be transmitted to the base station.

13. A reception apparatus for receiving data in a wireless communication system, the reception apparatus comprising:

a transceiver; and

at least one processor connected to the transceiver and configured to:

receive M/2 symbols from a transmission apparatus, wherein M is an integer greater than or equal to 1,

perform a fast Fourier transform (FFT) on the M/2 symbols, and

obtain M symbols including the M/2 symbols on which the FFT has been performed, and M/2 symbols obtained by copying the M/2 symbols on which the FFT has been performed, wherein the M symbols are symmetric and information of the M/2 symbols on which the FFT has been performed is same with information of copied M/2 symbols, and

perform an inverse discrete Fourier transform (IDFT) on the M symbols,

wherein the M/2 symbols received from the transmission apparatus are symbols on which π/2-binary phase shift keying (BPSK) modulation has been performed by the transmission apparatus, and

wherein a constellation of the M/2 symbols on which the FFT has been performed has only real components or imaginary components according to the π/2-BPSK modulation.

14. The reception apparatus of claim 13 , wherein the M/2 symbols received from the transmission apparatus are transmitted by using transmission power for transmitting the M symbols.

15. The reception apparatus of claim 13 ,

wherein the reception apparatus is a terminal and the transmission apparatus is a base station,

wherein the at least one processor is configured to:

receive downlink control information (DCI) from the base station, and

wherein the DCI comprises information that the π/2-BPSK modulation is performed on symbols and half of the symbols on which the π/2-BPSK modulation has been performed are transmitted to the terminal.