Abstract: The paper provides an overview of Conventional Orthogonal Frequency Division Multiplexing (OFDM), Interleaved OFDM (IOFDM) and Wavelet based systems. Description includes comparison of the tools for studying the signals. In this paper, we have evaluated BER performance for conventional OFDM, IOFDM and WOFDM systems. IOFDM system is proposed to increase the code rate without increasing the number of subcarriers and bandwidth. Later, the work is compared and simulation results in enhancement of performance with a moderate increase in computational complexity and delay.

Keywords: FFT, OFDM, CP, MCM, ICI, ADSL.