Wideband chaos is of interest for applications such as random number generation or encrypted communications, which typically use optical feedback in a semiconductor laser. Here, we show that replacing conventional optical feedback with phase-conjugate feedback improves the chaos bandwidth. In the range of achievable phase-conjugate mirror reflectivities, the bandwidth increase reaches 27% when ...

In atomic force microscopy (AFM) the imaging speed is strongly limited by the bandwidth of the feedback loop that controls the interaction between the measurement tip and the sample. A significant increase in closed-loop bandwidth can be achieved by combining a long-range, low-bandwidth actuator with a short-range, high-bandwidth actuator, forming a dual actuated system. This contribution discu...

The packet pair technique is a widely used method for estimating the available bandwidth of an end-to-end network path. We characterize the stochastic nature of the packet pair dispersion caused by bursty cross traffic and its adverse effect on available bandwidth estimation. In order to overcome this difficulty, we introduce a novel concept of the relative distance, which can be obtained from ...

A novel low-rate identication method for high power ampliers with memory-effect is presented. It is demonstrated that the required bandwidth of the feedback signal is not required to be greater than twice the signal modulation bandwidth, but is instead determined by the number of feedback samples and the degree of freedom of coefcients in the behavioral model. As the experimental measurements a...

This paper presents a framework for network bandwidth sharing to transport rate-adaptive packet video using feedback. We show how a weight-based bandwidth sharing policy can be used to allocated network bandwidth among competing video connections and design a feedback control algorithm using the available bit rate (ABR) ow control mechanism. A novel video source rate adaptation algorithm is int...

Current RF power amplifier (PA) linearization techniques are presently being investigated to improve PA linearity and power efficiency. One such linearization technique, Cartesian feedback (CFB), makes use of analog feedback to linearize a nonlinear plant (Figure 1). The commanded baseband symbol, I and Q, are compared to the symbol being transmitted by the PA, the baseband symbol is predistort...

The new fast orbit feedback system (FOFB) is being commissioned at the SPEAR3 light source. The system has a 4kHz sampling rate and 100Hz bandwidth. The correction algorithm is based on the Singular Value Decomposition (SVD) of the orbit response matrix. For performance tuning and additional flexibility when adding or removing Corrector Magnets (CM) and Beam Position Monitors (BPMs), we impleme...