Method and device for transmitting data in wireless communication system

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.

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.

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.