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Optimal Time Domain Equalization Design for Maximizing Data Rate of Discrete Multi-Tone Systems
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Graduate Program: Electrical & Computer Engineering
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Discrete multi-tone (DMT) is a multicarrier modulation technique in which the available bandwidth of a communication channel, such as twisted-pair copper media, is divided into several sub-channels or bins via a fast Fourier transform (FFT). Data concurrently flows downstream from a central office to a remote terminal, and upstream in the opposite direction.
The DMT method has been adopted in the US by the American National Standards Institute (ANSI) T1.413-1998 standard (Asymmetric Digital Subscriber Loop ADSL standard), and internationally by the International Telecommunications Union G.DMT (G.992.1) and G.Lite (G.992.2) [5] ADSL standards. DMT is figuring in the very-high-rate DSL (VDSL) standard proposals [6, 7, 8]. In the ANSI ADSL standard, DMT is used to generate up to 250 separate 4.3125 kHz wide downstream sub-channels from 26 kHz to 1.1 MHz. Likewise, DMT is used to generate 26 upstream sub-channels from 26 kHz to 138 kHz. Modulation by the inverse fast Fourier transform (IFFT) and demodulation by the FFT create nearly orthogonal sub-channels. Each sub-channel is nearly independent of the other sub-channels and the degree of independence increases with the number of sub-channels.
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