A Comprehensive Comparison and Evaluation of WPT and FFT Orthogonalization schemes in OFDM Multicarrier Transmission

Due to increasing demand of better performance in wireless communication systems, significance of using more robust transmission techniques against multipath and time variable channel distortion is increased. Although using multicarrier transmission schemes is not limited to recent years, the idea of utilizing Wavelet Packet Transform (WPT) as an alternative for Fast Fourier Transform (FFT) as the core of the multicarrier system is introduced in recent years. In this paper two different schemes of Orthogonal Frequency Division Multiplexing (OFDM) including FFT-based OFDM and WPT-based OFDM are introduced and their structures in different aspects and their performance over AWGN channel with different modulation mappings are investigated. Obtained results show better performance in WPT-OFDM systems.