For a class of uncertain nonlinear chaotic systems with unknown control gain signs and saturated input, by means Nussbaum function, scheme finite-time prescribed performance synchronization is proposed. Here, function used to eliminate the influence signs, fuzzy logic are estimate functions. Lyapunov theory prove that all errors converge predefined small range under designed method. Finally, si...

SUMMARY RF Variable Gain Amplifiers (RF-VGA) are important components for integrated TV broadcast receivers. Analog and digital controlled RF-VGAs are compared in terms of linearity and an AGC loop architecture suitable for digitally controlled RF-VGA is proposed. Further linearity enhancement applicable for CMOS implementation is also discussed .

How does the brain extract invariant properties of variable-rate speech? A neural model, called PHONET, is developed to explain aspects of this process and, along the way, data about perceptual context e ects. For example, in consonant vowel (CV) syllables such as /ba/ and /wa/, an increase in the duration of the vowel can cause a switch in the percept of the preceding consonant from /w/ to /b/...

In this paper, a generalization of the L2-gain inequality utilizing \point to set" distances [11, 10] is applied to cope with systems with persistent excitation. This generalization is compared with notions of power gain introduced in [4]. In particular it is found that the gain inequality associated with \point to set" distances freely admits a de nition of available storage and allows the sta...

Here are some samples : (1) Gradual gain in weight though common is not normal. Any gain over, the normal at the age of 25 has an adverse effect on health and longevity. Modern. tables for height and weight do not make a concession for age?p. 36. A picture shows the difference between the lean and the fat at the successive posts on the road of life. Against 3 lean men approaching the post marke...

This paper describes a new design method for lapped orthogonal transforms (LOTs) that can provide a desired tradeoff between coding efficiency and resilience to transmission errors. Traditionally, LOT bases have been designed to maximize the coding efficiency solely. When certain coefficients are lost due to impairments in the transmission channel, the reconstructed image is often unsatisfactor...

We characterize the symmetric capacity to within 1.7075 bits/s/Hz for the two-user Gaussian interference channel with feedback. The result makes use of a deterministic model to provide insights into the Gaussian channel. We derive a new outer bound to show that a proposed achievable scheme can achieve the symmetric capacity to within 1.7075 bits for all channel parameters. From this result, we ...

In the early visual system, a contrast gain control mechanism sets the gain of responses based on the locally prevalent contrast. The measure of contrast used by this adaptation mechanism is commonly assumed to be the standard deviation of light intensities relative to the mean (root-mean-square contrast). A number of alternatives, however, are possible. For example, the measure of contrast mig...

This paper presents a study of LO selfmixing and RF gain control issues in direct conversion receivers. In cellular systems, that use continuous time frequency duplexing, these can constitute serious problems. The presented topic is of special importance when digitally programmable gain is implemented at the RF frequencies before the downconversion mixers, practically in the LNA. Furthermore, t...