With an increase in user mobility, data rate and carrier frequencies we have to consider time variant channels. In order to overcome the impairments of the time varying channel on conventional OFDM system, a wavelet based OFDM system is investigated in place of FFT based system and its BER performance is analyzed for different Doppler frequencies. The results show that DWT based OFDM gives better performance compared to conventional OFDM system.
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K. M.S., S., P., and Dr. Ramanathan R., “Performance evaluation of DWT based multicarrier system in time varying channels”, International Journal of Engineering and Technology, vol. 7, pp. 1633-1641, 2015.