The performance of multiwavelets based OFDM system under different channel conditions

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Abstract

In wireless communication reception, the reliability of orthogonal frequency division multiplexing (OFDM) is limited because of the time-varying nature of the channel. This causes inter-carrier interference (ICI) and increases inaccuracies in channel tracking. This can effectively be avoided at the cost of power loss and bandwidth expansion by inserting a cyclic prefix guard interval before each block of parallel data symbols. However, this guard interval decreases the spectral efficiency of the OFDM system as the corresponding amount. Recently, it was found that based on Haar-orthonormal wavelets, discrete wavelet-based OFDM (DWT-OFDM) is capable of reducing the inter symbol interference (ISI) and ICI, which are caused by the loss in orthogonality between the carriers. DWT-OFDM can also support much higher spectrum efficiency than discrete Fourier-based OFDM (DFT-OFDM). In this paper the DFT-OFDM is replaced by Multiwavelets OFDM (DMWT-OFDM) in order to further reduce the level of interference and increase spectral efficiency. It is found that proposed Multiwavelet design achieves much lower bit error rates, increases signal to noise power ratio (SNR), and can be used as an alternative to the conventional OFDM. The proposed OFDM system was modeled tested, and its performance was found under different channel conditions.

Section snippets

Abbas Hasan Kattoush received his M.S. and Ph.D. degrees in Communication Eng. from USSR in 1979 and 1984, respectively. For 10 years Dr. Kattoush was a technical manager of a leading SAKHER computers company. He was a pioneer in computer networking and software engineering in Jordan. From 1993 to 2000 he worked at Applied Science University Amman, Jordan, where he was a founding member of the Department of Electrical and Computer Engineering. From 2000 to 2008 Dr. Kattoush was an associate

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    Abbas Hasan Kattoush received his M.S. and Ph.D. degrees in Communication Eng. from USSR in 1979 and 1984, respectively. For 10 years Dr. Kattoush was a technical manager of a leading SAKHER computers company. He was a pioneer in computer networking and software engineering in Jordan. From 1993 to 2000 he worked at Applied Science University Amman, Jordan, where he was a founding member of the Department of Electrical and Computer Engineering. From 2000 to 2008 Dr. Kattoush was an associate professor at Electrical and Computer Engineering Department at Al-Isra University, Amman, Jordan. Currently he is an associate professor and a head of Department of Electrical, Communications, and Computer Engineering at Tafila Technical University, Tafila, Jordan. His areas of research interest include DSP, digital communication systems, phase unwrapping, interferometric SAR image analysis, filtering, and interpretation. He has authored several tenths of research articles, textbooks, and computer software systems.

    Waleed Ameen Al-Jawher: Dean of Engineering College, University of Isra, Jordan. He received a School of Research in Digital Signal Processing (2005). He received his Ph.D. in Digital Signal Processing from the University of Wales, University College of Swansea, United Kingdom (1986). He has a teaching experience in engineering for 32 years. A total of 15 national awards. He published over 224 papers, supervised 202 M.Sc. and Ph.D. students. He received the First professor Award of University of Baghdad, the First professor Award of the Ministry of Higher Education & Scientific Research of Iraq (National first Professor Award). His present areas of research interest are the field of DSP and communication.

    Saad T. Nihad was born in Baghdad in 1976. He received his B.Sc. in Electrical Engineering from University of Baghdad in 1997, his M.Sc. and Ph.D. in Electronic and Communication from University of Baghdad in 2002 and 2006, respectively. He is working as a lecturer in the Electrical Engineering Department in the University of Baghdad. His areas of research interest are the field of DSP and communication.

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