New equalization approach for maximizing data rate in discrete multi tone systems

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 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 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 DWT-DMT system. The results of these experiments show that the performance of the DWT-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 DWT-DMT system can achieve a high bit rate ranging from 2.899 Mbps to 5.369Mbps.