Discrete wavelet multitone (DWMT) modulation is a wavelet transform based technique implemented using perfect reconstruction filter banks. It has been recently proposed for various wireline channels such as digital subscriber loops (DSLs) as a solution to the problems posed by a discrete multitone (DMT) transceiver including interblock interference (IBI) and lower spectral efficiency due to the...

The reliable delivery of information over severe fading wireless or wired channels is a major challenge in communication systems. At the heart of every communication system is the physical layer, consisting of a transmitter, a channel and a receiver. A transmitter maps the input digital information into a waveform suitable for transmission over the channel. The communication channel distorts th...

This paper examines existing channel models used with xDSL systems and identifies a key shortcoming namely, the implicit assumption that all impulse noise originates at the transmitter. Based on extensive data collected from the local loop, a new model is proposed which addresses this problem by combining a digital filter model of the transmission line with a distributed noise source. This bett...

The provision of interactive multimedia services such as video on demand teleshoping and distance learning to a large num ber of users still remains a challenging issue in the multimedia area Despite of recent technological advances in all levels of the distributed multimedia infrastructure storage network compression standardiza tion etc there is a strong need for feedback from public trials T...

Measurements from an Internet backbone link carrying TCP traffic towards different ADSL areas are analyzed in this paper. For traffic analysis, we adopt a flow based approach and the popular mice/elephants dichotomy. The originality of the experimental data reported in this paper, when compared with previous measurements from very high speed backbone links, is in that commercial traffic compris...

We address the impact of a too short cyclic prefix on multicarrier systems such as Orthogonal Frequency Division Multiplex (OFDM) and Discrete MultiTone (DMT). The main result is that the intersymbol interference (ISI) and intercarrier interference (ICI) may be spectrally concentrated and analytical expressions showing this are given. A practical implication is, e.g., that the cyclic prefix in ...

Results from previous studies indicate that numerous Internet Service Providers within Australia either have inadequately trained staff, or refuse to provide security support to end-users. This paper examines the security information supplied by Internet Service Providers on their website. Specifically content relating to securing; a wireless network, an ADSL router, and a Microsoft Windows bas...

Broadband access network technologies such as ADSL and FTTH (Fiber To The Home) are becoming increasingly popular in Japan. In line with this trend, new broadband content delivery services using streaming technology and CDN technology are starting to appear. However, there are various issues that need to be addressed in order to provide highquality services. This position aims to encourage disc...

| An improved optimization algorithm for the time domain equalizer (TEQ) is developed in case of Frequency Division Multiplexing-based Asymmetric Digital Subscriber Line (FDM-ADSL). In contrast with existing algorithms, our algorithm explicitly disregards the unused tones in the optimization function as well as in the non-triviality constraint. Some simulation results are presented for the upst...

Ethernet Passive Optical Networks (EPON) access systems are considered as an alternative to ADSL for high speed access to the Internet. Supported by the Ethernet First Mile Alliance and the IEEE, the MPCP protocol has been adopted as the standardized MAC protocol for EPONs. Moreover, the IPACT dynamic bandwidth allocation mechanism has been proposed for hierarchical multiplexing. Today, IPACT i...