A Comparative Study of FFT and Wavelet-Based OFDM Techniques for MIMO Wireless Systems over Fading Channels

Author(s)	Dr. Priyanka Jaiswal, Dr. Sanjay Jain
Country	India
Abstract	Orthogonal Frequency Division Multiplexing (OFDM) combined with Multiple Input Multiple Output (MIMO) antenna systems has become a fundamental technology in modern wireless communications, particularly in 4G and beyond. OFDM enables high data rate transmission within limited bandwidth, while MIMO systems provide spatial diversity to effectively mitigate the effects of channel fading. Conventional OFDM systems are primarily based on the Fast Fourier Transform (FFT). However, the increasing demand for higher performance in next-generation wireless systems has led to the exploration of alternative techniques such as Discrete Wavelet Transform (DWT)-based OFDM. In this work, a comparative performance analysis of FFT-OFDM and DWT-OFDM is presented. The study is further extended to evaluate their performance in MIMO systems under Rayleigh fading channel conditions. Haar wavelet is employed for the implementation of DWT-OFDM, and simulations are carried out using MATLAB. Performance metrics such as error rate and spectral efficiency are considered for evaluation. The results demonstrate that DWT-OFDM, both as a standalone system and in combination with MIMO, outperforms conventional FFT-based OFDM in terms of overall system performance.
Keywords	OFDM, MIMO, DWT, FFT
Field	Engineering
Published In	Volume 5, Issue 6, November-December 2024
Published On	2024-12-12

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