In modern DSL systems, far-end crosstalk is a major source of performance degradation. Crosstalk cancelation schemes have been proposed to mitigate the effect of crosstalk. However, the complexity of crosstalk cancelation grows with the square of the number of lines in the binder. Fortunately, most of the crosstalk originates from a limited number of lines and, for DMT-based xDSL systems, on a ...

We investigated the voluntary control of motor behavior by studying the process of deciding whether or not to execute a movement. We imaged the human dorsal cortex while subjects performed a countermanding task that allowed us to manipulate the probability that subjects would be able to cancel a planned saccade in response to an imperative stop signal. We modeled the behavioral data as a race b...

We investigate the Hawking radiation of black p-branes in superstring theories through the method of anomaly cancelation proposed by Robinson andWilczec et al. The metrics of black p-branes are spherically symmetric, but not the Schwarzschild type generally. We find that in order to make the method of Robinson and Wilczec et al. effective for the calculation of Hawking fluxes for general non-Sc...

Topological defects (TDs) appear almost unavoidably in continuous symmetry breaking phase transitions. The topological origin makes their key features independent of systems' microscopic details; therefore TDs display many universalities. Because of their strong impact on numerous material properties and their significant role in several technological applications it is of strong interest to fi...

Radio spectrum is a scarce and precious natural resource that is significantly underutilized with current fixed spectrum-licensing policies [1]. This has inspired the development of hierarchical spectrum-sharing systems, where secondary systems are allowed to access the underutilized spectrum of incumbents without causing harmful interference to legacy/primary systems. In this article, we are i...

Noise cancelation is the process done to remove out-of-range anomalies and make better edge boundaries interpretation. One of most challenging issues in describing gravitational maps separating related shallow sources from deep ones. Furthermore, Existing noise can it arduous separate blurred boundaries. In this study SE Iran, surveying was carried out areas west Qeshm Hormuz islands a regular ...

QR-DECOMPOSITION M Harteneck and R W Stewart Signal Processing Division Department of Electrical & Electronic Engineering University of Strathclyde Glasgow, G1 1XW, U.K. email: [email protected] [email protected] ABSTRACT In this paper the problem of acoustic echo cancelation is addressed using an adaptive IIR ltering algorithm based on a QR decomposition and a pseudo-linear re...

The overall performance of two-step flash A/D converters hinges on the second-stage fine comparator. This paper descibes the design of a 60 MHz fully differential comparator, intended for use in a 12-bit two-step flash converter. The comparator consists of four pre-amplifier stages followed by a regenerative latch. It uses a combination of output offset cancelation and input offset cancelation ...