The DMT (discrete multitone modulation) technique has been widely applied to data transmission over fading channels of twisted pairs. It has been shown that the DMT system with ideal filters can achieve within 8 to 9 dB of the channel capacity of ADSL. The DFT based DMT system is proposed as a practical DMT implementation but its optimality is never asserted. In this paper we will show that the...

In this dissertation, advanced modulation schemes and digital signal processing techniques are proposed and investigated through both numerical simulations as well as experiments, in order to overcome the limitations of multimode step index plastic optical fibers (SI-POF) to support data rates in the order of Gbps. In particular, novel multi-carrier modulation techniques with the inherent prope...

This report is a literature survey on multicarrier wireline communication systems, focusing primarily on the recent enhancements to the physical layer in Discrete Multitone (DMT) Modulation systems. We investigate methods used to improve the data rate versus reach performance of DMT systems proposed in the G.992.3 Asymmetric Digital Subscriber Lines-2 (ADSL2) and G.992.5 ADSL2+ standards. We al...

The increasing demand for high-bandwidth services such as corporate communications, fast Internet access and digital audio and video delivery presents both a great challenge and a great opportunity. To respond to this challenge, and to take advantage of the opportunity, the telecommunications industry is developing communication equipment based on clever implementations of highly efficient modu...

σ-Receptors are integral membrane proteins that have been implicated in a number of biological functions, many of which involve the modulation of ion channels. A wide range of synthetic ligands activate σ-receptors, but endogenous σ-receptor ligands have proven elusive. One endogenous ligand, dimethyltryptamine (DMT), has been shown to act as a σ-receptor agonist. Progesterone and other steroid...

elecommunications operators are responding to the competitive threat of cable and satellite services by offering high-speed applications and converged services to residential and business customers. These applications generally require minimum duplex bit rates in the range of 5 to 6 Mbits/second—both upstream and downstream (symmetric). While there are several digital subscriber line (DSL) tech...

| Starting from the optimization of multi-carrier systems the equivalence to single{carrier systems is shown with respect to the achievable signal{ to{noise ratio. This provides a new view on the topic. I. Introduction For many applications multicarrier modulation, often also denoted as discrete multitone (DMT) or orthogonal frequency division multiplexing (OFDM), is a strong competitor to sing...

We present a bit rate maximising per-tone equalisation (BM-PTEQ) cost function that is based on an exact subchannel SNR as a function of per-tone equaliser in discrete multitone (DMT) systems. We then introduce the proposed BM-PTEQ criterion whose derivation for solution is shown to inherit from the methodology of the existing bit rate maximising time-domain equalisation (BM-TEQ). By solving a ...

The discrete multitone modulation (DMT) systems have been widely used in various applications. The DMT system can be considered as a dual of a subband coder, obtained by using the synthesis bank as the transmitter and analysis bank as the receiver. In designing optimal subband coders, the objective is to minimize output quantization noise, whereas in the problem of designing optimal DMT system,...