The design of time-domain equalizers or TEQs for discrete multitone modulation (DMT) systems has recently received much attention. In this paper, we present a generalization of one such design method which takes into account the noise observed in a DMT channel. Furthermore, we show how this generalization can be used for the design of fractionally spaced equalizers or FSEs. Experimental results...

In telecommunication, the DSL is widely understood as ADSL. In ADSL, „A‟ stands for Asynchronous” which means that the data stream are not going at the same data rate. Asymmetric Digital Subscriber Line (ADSL) is a high speed internet access over an existing telephone line. To increase the spectral efficiency of the available bandwidth, ADSL provides services for customers to receive internet a...

Abstract: Cyclic prefix based channel equalization employed in the Discrete Multitone (DMT) modulation offers the advantage of simplified implementation. However, this method has the disadvantage of amplifying channel noise for channels having deep nulls in the frequency response. The in-home power line channel is one such channel that has high noise content, in addition to deep frequency nulls...

Discrete Multitone (DMT) modulation is a multicarrier technique which makes efficient use of the channel, maximizing the throughput by sending different numbers of bits on different subchannels. The number of bits on each subchannel depends on the Signal-to-Noise Ratio of the subchannel. The performance of a DMT system can be further increased by using powerful coding techniques. This thesis in...

Multi-carrier modulation (MCM) techniques are used for high bit rate data transmission in radio transmission systems. The main scope of this work includes understanding a multi-carrier modulation system and setting up a simulation environment for such a system as applied in the case of Asymmetric Digital Subscriber Loop (ADSL) system and Orthogonal Frequency Division Multiplex (OFDM) system. Th...

Discrete multitone (DMT) modulation is an attractive method for communication over a nonflat channel with possibly colored noise. The uniform discrete Fourier transforn (DFT) filter bank and cosine modulated filter bank have in the past been used in this system because of low complexity. We show in this paper that principal component filter banks (PCFB) which are known to be optimal for data co...

High speed Digital Subscriber Line (DSL) systems transmit signals that overlap in spectrum with the bands used for radio communications. AM broadcast stations and radio amateur transmitters result into electromagnetic interference impairing the DSL-receiver. For Discrete Multitone (DMT) systems, windowing, in combination with Radio Frequency Interference (RFI) cancellation has been proposed to ...

DMT modulation has become a standard communications method for DSL and indoor LAN technology. By utilising the FFT it is able to overcome the problems associated with transmission over a nonflat communications channel. In DSL and indoor LAN technologies, the dominant source of performance impairment is crosstalk. Results are presented here in the context of DMT on an economical cabling scheme w...

The Discrete MultiTone (DMT) modulation system is an attractive method for a high speed data transmission over a nonflat channel with possible colored noise. The IFFT is used in its transmitter in order to divide the available frequency spectrum into large independent narrow band sub-channels. A high speed and an efficient lattice architecture is proposed to implement the IFFT. This will speed ...