This paper presents a new implementation of discrete multi-tone (DMT) systems based on different discrete transforms that include the discrete sine transform (DST), discrete cosine transform (DCT), and discrete wavelet transform (DWT). The implementation also considers time-domain equalization to mitigate channel distortion. Compared to the fast Fourier transform discrete multi-tone (FFT-DMT) s...

This paper describes a modulation scheme achieving FarEnd Crosstalk (FEXT) cancellation, assuming that joint signal processing among the users can be performed at either the receiver or at the transmitter side. The multi-user channel is modeled as a Multiple-Input-MultipleOutput (MIMO) system, and the development starts with the zero-forcing Generalized Decision Feedback Equalizer (GDFE) ([1])....

Orthogonal Frequency Division Multiplexing (OFDM) and in particular Discrete Multitone (DMT) modulation has been proposed for the physical layer of wideband wireless local area networks. As an alternative, Filtered Multitone (FMT) modulation can be also considered, since it exhibits significantly lower spectral overlapping between adjacent subchannels, so providing higher transmission efficienc...

Discrete Multi-Tone (DMT) systems with optimal power and bit loading are suitable for wired-line applications but have high complexity in wireless links because of the channel uctuations. Adaptive modulation is better suited in wireless communications, assuming that training sequences are periodically transmitted to allow an accurate estimate of the channel parameters. In these applications, ra...

Multicarrier modulation schemes are attractive for transceiver lter design on static frequency selective channels. When the channel is time varying, a straightforward application of such schemes requires channel tracking. If the time variation is relatively slow, it is likely that conventional DMT channel partitioning will not incur drastic reduction in signal to noise ratios (SNRs). We provide...

In this paper, we experimentally demonstrate an optical frequency comb (OFC) based transmitter, employing directly modulated active demultiplexers, for data center interconnects. The results validate that the proposed transmitter has potential to achieve aggregate rates of 100 Gb/s (8 × 12.5 Gb/s) and 200 25 systems 4- 16- quadrature amplitude (QAM) discrete multi-tone (DMT) modulation. An OFC ...

An alternative receiver structure is presented for discrete multitone (DMT)-based systems. The usual structure consisting of a (real) time domain equalizer (TEQ) with a (complex) 1-taps frequency domain equalizer (FEQ) per tone, is modiied into a structure with a (complex) multitaps FEQ per tone. By solving an MMSE problem, the SNR is maximized for each individual tone. This always results in a...

Common to all DMT/OFDM systems is a large peak-to-average ratio (PAR), which can lead to low power efficiency and nonlinear distortion. Tone reservation uses unused or reserved tones to design a peak-canceling signal to lower the PAR of a transmit block. In DMT ADSL systems, the power allocated to these tones may be limited due to crosstalk issues with many users in one twisted pair bundle. Thi...

Recently, discrete Fourier transform (DFT)-based discrete multitone modulation (DMT) systems have been widely applied to various applications. In this paper, we study a broader class of DMT systems using more general unitary matrices instead of DFT matrices. For this class, we will show how to design the optimal DMT systems over frequency-selective channels with colored noise. In addition, asym...