Receiving apparatus and method for providing input bits of fast fourier transformer according to modulation
View Patent ↗A technology is provided capable of improving the efficiency of an OFDM system by obtaining the performance in Bit Error Rate (BER) in a wireless communication using OFDM and determining the minimum FFT input bit that produces a SNR difference of 0.1 dB or below with respect to a theoretical BER graph at a desired performance.
1. A receiving apparatus for providing input bits for a Fast Fourier Transformer (FFT) on an Orthogonal Frequency Division Multiplexing (OFDM) system using Fourier Transform (FT), the receiving apparatus comprising:
a modulation scheme determiner configured to determine a modulation scheme of an OFDM signal received in the OFDM system; and
an input bit determiner configured to provide upper 7 bits of the received OFDM signal as input bits to the Fast Fourier Transformer, in response to the modulation scheme determiner determining that the received OFDM signal is a Quadrature Phase Shift Keying (QPSK) signal.
2. The receiving apparatus of claim 1 , wherein the input bit determiner is configured to provide upper 8 bits of the received OFDM signal as input bits to the Fast Fourier Transformer in response to the modulation scheme determiner determining that the received OFDM signal is a 16 Quadrature Amplitude Modulation(16 QAM) signal.
3. The receiving apparatus of claim 1 , wherein the received OFDM signal is converted to a digital signal and a Cyclic Prefix (CP) is removed from the digital signal.
4. An Orthogonal Frequency Division Multiplexing (OFDM) signal receiving method for providing input bits for a Fast Fourier Transformer (FFT), the method comprising:
receiving an OFDM signal modulated according to a modulation scheme in an OFDM system;
determining the modulation scheme of the received OFDM signal; and
providing upper 7 bits of the received OFDM signal as input bits to the FFT of a receiving apparatus in the OFDM system, in response to the modulation scheme being determined as Quadrature Phase Shift Keying (QPSK).
5. The method of claim 4 , further comprising providing upper 8 bits of the received OFDM signal as input bits to the FFT, in response to the modulation scheme being determined as a 16 Quadrature Amplitude Modulation (16 QAM).
6. The method of claim 4 , wherein the received OFDM signal comprises noise and a signal, wherein the signal is modulated by a transmitting apparatus of the OFDM system.
7. The method of claim 4 , further comprising:
converting the received OFDM signal to a digital signal; and
removing a Cyclic Prefix (CP) from the digital signal.