∙ Suitable for digital modulation (QAM, OFDM). ∙ 3rd and 5th order distortion correction. ∙ Iterative Minimum Mean Square Error algorithm. ∙ Complex 3rd and 5th order coefficient estimation and real-time application. ∙ Selectable iterative algorithm convergence speed. ∙ Automatic timing recovery on feedback signal. ∙ Automatic phase recovery on feedback signal. ∙ Automatic forward power control...

The first part of this two-part paper, published separately, discusses the quantization noise leakage problem caused in cascaded delta–sigma (MASH) analog-to-digital converters (ADC’s) by the imperfections of the first-stage analog circuitry. It also proposes adaptive digital techniques based on detecting and minimizing the leakage noise in the output signal. In some cases, this is difficult to...

The chirp of an ultrashort laser pulse can be extracted with high accuracy from a modified spectrum auto-interferometric correlation waveform by using a new time domain algorithm that allows signal averaging. We display results revealing high sensitivity to chirp even with signal-to-noise levels approaching unity. Correction algorithms have been developed to accommodate signal distortion arisin...

abstract background: in vivo measurements of applied dose during radiotherapy treatment, is important to ensure accurate dose delivery to patients. uncertainty in dose delivery should fall within ±5% of the prescribed dose as recommended by icru. assessment of dose for radiotherapy applications performed with various types of detectors. in this study, semiconductor diodes were used which have s...

The MAX1452 is a high-performance analog signal conditioner that has been widely accepted and is used in a variety of industrial and automotive applications. Sensor-output nonlinearity correction is a critical requirement in some applications. Although nonlinearity correction has not been implemented in the MAX1452, it can be achieved simply by using an additional three resistors in the applica...

Introduction A flow-sensitive black-blood imaging (FSBB) technique was proposed, where small motion probing gradients (MPG) of bfactor=2~4 [sec/mm] were combined with a 3D gradient-echo (GRE) sequence [1]. The FSBB technique was demonstrated to enhance slow flow vessels, such as collateral vessels [2], perforating veins [3], vascular malformations [4]. Simple magnitude images provided sufficien...

of Dissertation Presented to the Graduate School of the University of Florida in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy NEED BASED FEEDBACK: AN OPTIMIZATION APPROACH By Debraj Chakraborty August 2007 Chair: Jacob Hammer Major: Electrical and Computer Engineering Feedback is often used to overcome the adverse effects of perturbations and uncertainties on t...

We present a design for an optical data communications receiver-transmitter pair based on the holographic correction of a large diameter, poor-quality, reflecting primary mirror. The telescope has a narrow bandwidth (<0.1 nm) with good signal frequency isolation (>60 dB) and is scalable to meter-class apertures. We demonstrate the correction of a reflector telescope with over 2000 waves of aber...

Introduction Motion during image acquisition can cause serious image artifacts. To overcome this problem the use of navigator signals ([1-3]) has been proposed combined with either realtime correction of the data acquisition or motion compensated reconstruction. The quality of the correction depends critically on the estimated motion derived from the navigator signal. Here, we present a fast, r...

Background Recently, high-field 7T MR imaging was introduced. The higher field-strength has potential advantages, mainly related to increased signal-to-noise-ratio. One of the potentially exciting applications may be cardiovascular MR imaging. Cardiovascular MRI requires robust correction for heart motion, breathing motion and correction of field inhomogeneities. Therefore, cardiovascular imagi...