In this paper, we propose to use Brownian motions to model families of continuoustime multiuser Gaussian channels without bandwidth limit. It turns out that such a formulation allows parallel translation of many fundamental notions and techniques from the discrete-time setting to the continuous-time regime, which enables us to derive the capacity regions of a continuous-time white Gaussian mult...

High-speed imaging by atomic force microscopy (AFM) requires the implementation of a fast control of tip–surface distance to maintain a constant interaction force. In particular, a well-controlled low load force is essential for observing soft biological molecules without causing damage to the sample. The accurate control of tip–surface distance where only feedback control is used is intrinsica...

In the modern opto-electronic transceiver designs, the high-speed frontend circuits of the optical receivers are considerably focused on the circuit designs. Many different topologies have been published since the optical fiber was applied for transmitting high data rate signal. In the optical transceivers, the transimpedance amplifier (TIA) plays a critical role in converting the input current...

A design approach for a tunable active filter of constant bandwidth and center-frequency gain is described. The approach is based on a feedback configuration with a complex pole pair in the forward transfer function, and a complex zero pair in the feedback transfer function. Center frequency tuning is achieved with the variation of only one element, a potentiomenter, which controls the feedback...

Many end-to-end feedback flow control protocols experience the rate oscillations caused by latency phase shift (LPS). This problem comes from time-varying bandwidth and non-zero feedback latency. A temporal flow control (TFC) protocol called MTS (Multiple-Time-Scale) was proposed to significantly reduce the oscillations in our earlier publication [2]. In this paper, the class of temporal flow c...

A negative feedback mechanism was added to the network. Feedback was developed using both control and queuing theory. The congested signalling was tested for stability using control theory. Kendall notation was used to determine both arrival and service rates with all the queue disciplines. Matlab was used to simulate the model. Bode plots and impulse responses were used to analyse the performa...

abstract the extent to which teachers’ written corrective feedback (wcf) is conducive to esl learners’ improvement has been discussed since truscott’s claim in 1996. the mentioned debate continues because there has been lots of contrastive research studies with different results. this paper presents the results of a 2-month study of the effectiveness of wcf to 65 low intermediate iranian learne...

Presently there exists a great demand for wireless systems that achieve high data transmission rates while using as little power and bandwidth as possible. Maximum data transfer for a given channel width demands sophisticated modulation techniques, the best of which require a linear power amplifier (PA). The strong tradeoff between linearity and power efficiency in PA’s has motivated research i...

This paper introduces a new, adaptive-filter-based controller that shows advantageous properties from the viewpoint of its communication requirement. The algorithm is called signed-error filtered-x LMS (SE-FxLMS). Its novelty is characterized by the fact that it makes possible data compression in the feedback path of adaptive-filter-based control loops in a very simple way. This feature is espe...

The need for high speed, wideband amplifiers is the driving force behind the development of the Current Feedback Amplifier (CFA). The CFA has significant advantages over conventional amplifiers in terms of slew rate performance and inherently wide bandwidth. This paper provides a review of the theory and design of current feedback amplifiers.