A Review on wavelet transform as a substitute to cyclic prefix removal in FFT in OFDM

The performance and versatility of wireless communication effected by allocated spectrum for communication. The utility of spectrum depends on modulation technique and allocation process. In conventional OFDM modulation technique uses cyclic prefix (guard band) for prevention of interference in carrier signal. From that process waste some valuable bandwidth using cyclic prefix. Now in these day wavelet transform function replace FFT process for removal of cyclic prefix and improve the efficiency of bandwidth. Wavelet transform work in two different modes one is details (high filter) and another one is approximation (lower filter). The combination of low filter and high filter in form of wavelet transform and remove the cyclic prefix in OFDM modulation system. In this paper, we study of wavelet transform function such as DCT, WPT and IWPT instead of FFT.