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This paper presents a new time domain equalizer (TEQ), which can be used in discrete multi-tone (DMT) systems to maximize the bit rate. The proposed TEQ is tested in the fast Fourier transform based discrete multi tone (FFT-DMT) system, and in a proposed discrete wavelet transform based discrete multi-tone (DWT-DMT) system. The objective of the proposed DW T-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 proposed TEQ is presented in the paper. Simulation experiments have been carried out to test the effect of the proposed TEQ with the FFT-DMT system and the proposed DW T-DMT system. The results of these experiments show that the performance of the DW T-DMT system with the proposed TEQ is better than the FFT-DMT system with this TEQ over the eight standard carrier serving area (CSA). The results also show that employing the proposed TEQ in the DW T-DMT system can achieve a high bit rate ranging from 2.899 Mbps to 5.369Mbps.

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This paper proposes a new blind, adaptive channel shortening for multi-carrier systems. We use the DST; along with its inverse as a replacement for the inverse fast Fourier transform / fast Fourier transform (IFFT/FFT) stages in DMT systems. The performance of the discrete Fourier transform-DMT (DFT-DMT) system is investigated with the proposed DST-DMT system over the standard carrier serving area (CSA) loop1, the results in this paper show that employing the proposed DST-DMT system rather than the conventional DFT-DMT system can provide a higher bit rate.