Existing integration algorithms often assume that the registration error of neighbouring views is an order of magnitude less than the measurement error [3]. This assumption is very restrictive that automatic registration algorithms can hardly meet. In this paper, we develop a novel integration algorithm, robust to both large registration errors and heavy scanning noise. Firstly, a pre-processin...

PURPOSE The purpose of this study was to evaluate the refractive and visual outcomes of wavefront-guided laser in situ keratomileusis (LASIK) in eyes with myopic astigmatism and cylindrical component ≥2.0 diopter (D). METHODS In this retrospective study, 611 eyes that underwent LASIK for simple or compound myopic astigmatism were analyzed. Preoperative refractive cylinder ranged from -2.00 D ...

We extend the use of the least squares method to develop a recursive algorithm for the design of adaptive transversal filters such that, given the least-square estimate of a vector of a filter at iteration, we may compute the updated estimate of this vector at iteration upon the arrival of new data. In this paper, we propose a new tap-weight-updated RLS algorithm for an adaptive transversal fil...

In this article is proposed the Direct Torque Control (DTC) with Space Vector Modulation (SVM) based on Self-Tuning Fuzzy Logic(STFL) controller. This controller determines dynamically the load angle between stator and rotor flux vectors and in consequence the electromagnetic torque necessary to supply the motor load. The rule base for STFL controller is defined in function of the error and the...

A common figure of merit in multi-carrier systems is the error vector magnitude (EVM). A method for EVM computation of a multi-carrier signal without any underlying model (e.g., the Gaussianity assumption) was proposed in a previous work of the authors. However, it addressed only the case of identical constellations and power loadings in all tones. In practice, however, the constellation and po...

The method of direct modulation using complex signals is used to implement signal paths transmitters in base stations cellular communication systems. In the process modulation, there are mismatches gain coefficient and phase quadrature components signal. Mismatch degrades Error Vector Magnitude (EVM) at receiver, which turn results an increased Bit Rate (BER). quality received expressed bit err...

A Rectangular to Polar coordinate converter based on scaling free vectoring CORDIC is proposed in this research paper. Polar coordinates are most appropriate for the systems displaying radial symmetry. Here scaling free CORDIC algorithm operating in vectoring mode computes Polar coordinate of input vector i.e. absolute magnitude and phase angle from its rectangular coordinate. Using this algori...

We present a new method for reconstructing a 3D vector field from multiple 3D Pulsed Wave Doppler echo images. A weakness of Doppler imaging is that only a 1D projection of the true 3D velocity (the component of the velocity parallel to the echo beam direction) is measured. We propose a method to use registered multiple Doppler views to calculate 3D flow vectors using a Least Mean Squares (LMS)...

A novel approach to transmitting two vector signals using a single optical carrier based on IQ modulation and coherent detection is proposed and demonstrated. In the proposed system, two quadrature phase-shift keying (QPSK) signals are IQ modulated on an optical carrier with one polarization state using a dual-parallel Mach-Zehnder modulator (DP-MZM). The optical carrier with an orthogonal pola...