International Journal of Engineering and Technology

In this work, the performance of DWT based OFDM is studied and compared it with conventional FFT based OFDM over frequency selective channels in different test environments. The Bit Error Rate (BER) estimation is done to evaluate the performance of both the systems. In DWT based OFDM, different wavelet families such as haar, daubechies, coiflet and biorthogonal were used with different levels of decomposition. The simulation results show that in all channels, DWT based OFDM requires less SNR value to achieve the minimum BER of 10-3, when compared to conventional FFT based OFDM. Therefore, DWT based OFDM can be used in place of FFT based OFDM with high bandwidth efficiency.