Performance Analysis of DWT, DCT & FFT based OFDM over Noisy Channel Environments for WIMAX


  • Shalinee Singh Parihar M.Tech Scholar Department of Electronics and Communication Engineering, Sagar Institute of Research & Technology, Bhopal, M.P, India
  • Virendra Singh Professor, Department of Electronics and Communication Engineering, Sagar Institute of Research & Technology, Bhopal, M.P,India



FFT; DWT; DCT; OFDM; WIMAX; Hata Propagation Model; Okumura Propagation Model; BER; SIMULINK;


 As the world move in to the future, there is a rising demand for high performance, high capacity and high bit rate wireless communication systems to integrate wide variety of communication services such as high-speed data, video and multimedia traffic as well as voice signals. Orthogonal Frequency Division Multiplexing (OFDM) has made tremendous improvement possible in wireless technology. OFDM is a multicarrier system that provides an efficient means to handle high-speed data streams over a multipath fading environment. Orthogonal frequency division multiplexing (OFDM) is a powerful technology to increase the data rate transmission over mobile wireless channels. The problem with conventional OFDM in which Fast Fourier Transform (FFT) was used to transform and map data onto orthogonal subcarriers is that it was inherently inflexible and had high complexity. Wavelet analysis offers strong advantages over Fourier analysis, as it has a time-frequency domain operation, thus allowing optimal flexibility with less complexity.

In this paper, the performance comparison of DWT based OFDM system is performed with FFT based and DCT based OFDM system under the joint impact of path loss, multipath fading and noise in WiMax environment. The performance comparison of wavelet families such as Haar, Daubechies and Biorthogonal is also performed for different modulation techniques with different path loss methods and concluded that Daubechies based wavelet reduces the BER as compared to other wavelets. The performance of the DWT based OFDM system was analyzed for different modulation techniques with different path loss methods. Thus it is inferred that DWT reduces the BER as compared to DCT and FFT in the OFDM based system and improves the performance in multipath fading environments in the WiMax system.


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How to Cite

Parihar, S. S., & Singh, V. (2017). Performance Analysis of DWT, DCT & FFT based OFDM over Noisy Channel Environments for WIMAX. SMART MOVES JOURNAL IJOSCIENCE, 3(9), 1–8.