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Discrete framelet transform based OFDM system using N-FRAT mapping over Rayleigh fading channel

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Abstract

This article proposes an N-finite Radon transform (N-FRAT) and a discrete framelet transform (FT) for the design of a new orthogonal frequency division multiplexing (OFDM) system. In the proposed system, the inverse FT (IFT) and FT were used instead of the inverse fast Fourier transform (IFFT) and fast Fourier transform (FFT) to realize multicarrier modulation and demodulation techniques, respectively. Simultaneously, it was suggested that the N-FRAT technique operate as a data mapper instead of the conventional phase shift keying (PSK) and quadrature amplitude mapping (QAM), which are usually used with the traditional OFDM system. The usage of the N-FRAT and FT in the proposed system led to an increase in the orthogonality between the subcarriers due to the application of IFFT in the N-FRAT, which was added to improve the orthogonality and time–frequency localization properties of the FT. Furthermore the proposed structure improved the bandwidth efficiency through the elimination of the cyclic prefix compared to the traditional system. The proposed system was simulated and compared with other OFDM systems, such as FFT based OFDM using N-FRAT mapping (N-FRAT-FFT-OFDM), FT based OFDM using QAM mapping (QAM-FT-OFDM), and FFT based OFDM using QAM mapping (QAM-FFT-OFDM). The simulation was performed over frequency selective fading channel using MATLAB technical programming language. The results of simulations showed that the new structure outperformed the other three systems by reducing the inter-symbol interference (ISI) and inter-carrier interference (ICI), which then improved the bit error rate (BER) performance.

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Authors and Affiliations

  1. School of Computer and Communication Engineering, Universiti Malaysia Perlis (UniMAP), 02060, Arau, Perlis, Malaysia

    Suha Q. Hadi, Phaklen Ehkan, M. S. Anuar & Sameer A. Dawood

  2. Electrical Department, Al-Mustansiriyah University, Baghdad, Iraq

    Suha Q. Hadi

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  1. Suha Q. Hadi
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  2. Phaklen Ehkan
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  3. M. S. Anuar
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  4. Sameer A. Dawood
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Correspondence to Suha Q. Hadi.

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Hadi, S.Q., Ehkan, P., Anuar, M.S. et al. Discrete framelet transform based OFDM system using N-FRAT mapping over Rayleigh fading channel. Wireless Netw 24, 755–767 (2018). https://doi.org/10.1007/s11276-016-1367-z

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