Digital Signal Processing

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Wavelet Transform for Performance Enhancement of Discrete Multi-Tone Systems


Affiliations
1 Jazan University, Saudi Arabia
2 Helwan University, Cairo, Egypt
3 Menoufia University, Menou, Egypt
4 Menoufia University, Egypt
5 Dept. Electronics and Electrical Communications, Menoufia University, Egypt
6 Menoufia University, Menouf, Egypt
     

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This paper presents a new implementation of Discrete Multi-Tone (DMT) systems based on the Discrete Wavelet Transform (DWT) and time-domain equalization to maximize the bit rate. The objective of the proposed DWT-DMT system is to make use of the sub-band decomposition property of the DWT to reduce the channel effects on the transmitted signals. The mathematical model of the Time-domain Equalizer (TEQ) utilized in this paper is presented. This equalizer is tested in the Fast Fourier Transform Discrete Multi-Tone (FFT-DMT) system, and in the proposed DWT-DMT system for comparison. Simulation experiments shows that the performance of the proposed DWT-DMT system with the TEQ filter bank is better than that of the FFT-DMT system with the TEQ filter bank over the eight standard Carrier Serving Area (CSA) loops. The results show that employing the TEQ filter bank in the proposed DWT-DMT system can achieve high bit rates ranging from 2.899 Mbps to 5.369 Mbps.


Keywords

DMT System, DWT, FFT, TEQ.
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  • Wavelet Transform for Performance Enhancement of Discrete Multi-Tone Systems

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Authors

Samir Abd Elghafar
Jazan University, Saudi Arabia
Salaheldin M. Diab
Helwan University, Cairo, Egypt
Bassiouny M. Sallam
Menoufia University, Menou, Egypt
S. El-Rabaie
Menoufia University, Egypt
Moawad I. Dessouky
Dept. Electronics and Electrical Communications, Menoufia University, Egypt
Fathi E. Abd El-Samie
Menoufia University, Menouf, Egypt

Abstract


This paper presents a new implementation of Discrete Multi-Tone (DMT) systems based on the Discrete Wavelet Transform (DWT) and time-domain equalization to maximize the bit rate. The objective of the proposed DWT-DMT system is to make use of the sub-band decomposition property of the DWT to reduce the channel effects on the transmitted signals. The mathematical model of the Time-domain Equalizer (TEQ) utilized in this paper is presented. This equalizer is tested in the Fast Fourier Transform Discrete Multi-Tone (FFT-DMT) system, and in the proposed DWT-DMT system for comparison. Simulation experiments shows that the performance of the proposed DWT-DMT system with the TEQ filter bank is better than that of the FFT-DMT system with the TEQ filter bank over the eight standard Carrier Serving Area (CSA) loops. The results show that employing the TEQ filter bank in the proposed DWT-DMT system can achieve high bit rates ranging from 2.899 Mbps to 5.369 Mbps.


Keywords


DMT System, DWT, FFT, TEQ.