FrFT based OFDM system for Wireless Communication

The demand for higher data rates over wireless channels is growing day by day. This had provided by 4G systems by using multicarrier communication systems like OFDM. The BER of 4G systems can further improve by doing time, frequency analysis of signal while propagating in the channel. In this paper, Fractional Fourier transformation (FrFT) based OFDM system had presented with 512-PSK modulation technique. The BER response of proposed system had analysed under various wireless fading channels like AWGN, Rayleigh, Rician and Nakagami channels. The proposed system achieved improvement of 1.5 dB BER at 10^-2.9 SNR for α_opt = 0.9 under the AWGN channel for 512-PSK modulation technique. For Rayleigh and Rician channel proposed system for 512-PSK modulation achieved 1.5 dB improvement in BER at 10^-2.9 SNR under both channels for α_opt = 0.4 and α_opt = 0.9 respectively. Under Nakagami channel, said system achieved 1.0 dB improvement in BER at 10^-2.8 SNR for α_opt = 0.4 using the 512-PSK modulation technique.