Apparatus and method for transmitting data using a plurality of carriers

An apparatus for generating a primary synchronization signal in a communication system, the apparatus comprising:

• a generating module configured to generate CAZAC (Constant Amplitude Zero Auto-Correlation) sequences with a length of N by repeating CAZAC sequences two or four times within one orthogonal frequency division multiplexing (OFDM) symbol of a time domain;
• at least a DFT module configured to perform a DFT (Discrete Fourier Transform) operation for the CAZAC sequences with the length of N or an FFT module configured to perform an FFT (Fast Fourier Transform) operation for the CAZAC sequences with the length of N;
• at least an IDFT module configured to perform an IDFT (Inverse Discrete Fourier Transform) operation for the CAZAC sequences on which the DFT is performed or an IFFT module configured to perform an IFFT (Inverse Fast Fourier Transform) operation for the CAZAC sequences on which the FFT is performed;
• a circular shifting module configured to circular shift in a frequency domain the CAZAC sequences on which the IDFT or IFFT is performed;
• and
• a generating module configured to generating the primary synchronization signal using the circular shifted CAZAC sequences;
• and
• a transmitting module configured to multiplex the generated primary synchronization signal with a secondary synchronization signal by a TDM (Time Division Multiplexing) scheme in a specific time duration and to transmit the multiplexed primary synchronization signal,
• wherein CAZAC sequences with a length of 36 in the time domain are repeated twice, and
• wherein values of the CAZAC sequences with the length of 36 include real values and imaginary values and are represented as:
• Real
• Imaginary
• 0
• 1
• 0
• 1
• −cos(π/3)
• −sin(π/3)
• 2
• −1
• 0
• 3
• −cos(π/3)
• sin(π/3)
• 4
• cos(π/3)
• sin(π/3).