... Title : Quadrature Clock Modulation Versus Binary and Quadrature Phase Shift Keying in the Presence of Intersymbol Interference. ...
DTIC Science & Technology
... discrete directions. Spatial dependence is approximated through spatial differencing or with a quadrature rule. The spatial quadrature effectively ...
A quadrature component cancellation and measuring system comprising a detection system for detecting the quadrature component from a primary signal, including reference circuitry to define the phase of the quadrature component for detection is described. ...
National Technical Information Service (NTIS)
... RESULTS OF PHASE QUADRATURE COMPONENTS OF MICROWAVE FORWARD SCATTERING FROM RANDOM WATER WAVES,. ...
Recent papers of P. Davis and P. Rabinowitz and of P. Rabinowitz study the problem of 'ignoring the singularity' in numerical quadrature of singular integrands. Among the other things they show that for certain quadratures if the singularity occurs at an ...
Several new quadrature sets for use in the discrete ordinates method of solving the Boltzmann neutral particle transport equation are derived. These symmetric quadratures extend the traditional symmetric quadratures by allowing ordinates perpendicular to ...
The application of linear multistep methods to differential equations defining quadrature problems yields relations between the multistep coefficients and the quadrature weights. By means of these relations quadrature formula are constructed and analyzed ...
A new class of quadrature rules for the integration of both regular and singular functions is constructed and analyzed. For each rule the quadrature weights are positive and the class includes rules of arbitrarily high order convergence. The quadratures r...
Gauss quadrature is a commonly used method for approximating univariate (even multivariate in certain cases) integrals. In Gauss quadrature the values of the function to be integrand, at certain points of the integration, are used. In this work we attempt to bring extra flexibility to Gauss Quadrature by also using the derivative of ...
NASA Astrophysics Data System (ADS)
... Title : Quadrature Detection for the Separation of the Signals of Positive and Negative Ions in Fourier Transform Ion Cyclotron Resonance Mass ...
What is Gauss Quadrature? The general Gauss quadrature formula is a numerical integration formula of the following form: ...
E-print Network
... Title : Implementation of a Quadrature Mirror Filter Bank on an SRC Reconfigurable Computer for Real-Time Signal Processing. ...
... Accession Number : ADA408553. Title : Herriot Cell Augmentation of a Quadrature Heterodyne Interferometer. Descriptive Note : Viewgraphs. ...
... The narrowband data will be quadrature phase shift keyed, biphase shift keyed, and quadrature differential phase shift keyed. (Author). ...
... Abstract : Integrals of a function of a single variable can be expressed as the sum of a numerical quadrature rule and a remainder term. ...
... Accession Number : ADA089563. Title : A Compensation Method for Quadrature Modulation. Descriptive Note : Technical note,. ...
The quadrature phase angle .phi.(t) of a pair of quadrature signals S.sub.1 (t) and S.sub.2 (t) is digitally encoded on a real time basis by a quadrature digitizer for fractional .phi.(t) rotational excursions and by a quadrature up/down counter for full .phi.(t) rotations. The pair of ...
Energy Citations Database
Quadrature formulas for double integrals are described. Examples are used to given an idea of what should be proven about quadrature formulas. Proofs are simple and cover formulas of third- and fifth-degree polygonal accuracy. Several problems are provide...
Quadrature Clock Modulation (QCM) is a binary phase shift keying (BPSK) technique in which alternate bits are transmitted orthogonally. Compared to normal BPSK modulation, QCM improves the performance of a communication system which is limited by intersym...
The present paper concerns the semi-cardinal quadrature formulae introduced in a previous paper. These were the limiting forms of Sard's best quadrature formulae as the number of nodes increases indefinitely. Here the authors give a new derivation and cha...
The natural correspondence between bounded planar quadrature domains, in the terminology of Aharonov-Shapiro, and certain square matrices with a distinguished cycle vector is further exploited. Two different curbature formulas on quadrature domains, that ...
This technical report presents the results of an investigation of the performance of band-partitioning filters when the complex signals being transformed contain quadrature errors. Phase and amplitude errors between the in-phase (I) and quadrature-phase (...
In this paper, we consider efficient modified Filon-type method for the integration of systems containing Bessel function and gives error analysis for these quadratures. Preliminary numerical results show the effectiveness and accuracy of the quadrature for large arguments of integral systems.
This reprint shows how to combine incidence matrices, which admit Hermite-Birkhoff quadrature formulas of Gaussian type for any positive measure, in such a way that the resulting matrix also admits Gaussian type quadratures for any positive measure. Moreo...
Two methods of modulation, quadrature and amplitude-phase, are being considered for the near-term implementation of clutter or extended targets. A test of quadrature modulation has been made with fairly good results (44 dB suppression for single-sided Gau...
The electron moments included in this data set are derived from quadrature integration of the solar wind electron distributions (with some fitting) measured ...
NASA Website
Fig. 2. At conjunction of Mars and Earth, Mars becomes invisible in the sun's rays. Best observation period is from quadrature to quadrature, Samuel Glasstone, ...
Aug 18, 2011 ... The electron moments included in this data set are derived from quadrature integration of the solar wind electron distributions (with some ...
At the time of the spring 2003 Ulysses-SOHO-Sun quadrature, Ulysses was off the East limb of the Sun
NASA Technical Reports Server (NTRS)
SOHO-Ulysses quadrature occurs when the SOHO-Sun-Ulysses included angle is 90 degrees. It is only at
... 1.0 INTRODUCTION ... PN - Pseudo Noise PSK - Phase Shift Keying PSTN ... QAM - Quadrature Amplitude Modulation QPSK -Quadrature Phase Shift ...
... These quadrature output signals are passed through respective pulse-repetition- frequency discriminators corresponding to the quadrature prf ...
A new concept has been developed which allows direct-to-RF conversion of digitally synthesized waveforms. The concept named Quadrature Error Corrected Digital Waveform Synthesis (QECDWS) employs quadrature amplitude and phase predistortion to the complex waveform to reduce the undesirable quadrature image. Another undesirable product ...
DOE Information Bridge
of quadrature phase-shift-keying (QPSK), a multiple bit differential detection scheme is described for offset QPSK that also exhibits continuous improvement ...
Hamiltonian n-dimensional Lotka-Volterra systems are introduced that have n-1 conserved quantities. The explicit integrability in quadratures is demonstrated.
Page 1. iv IMPROVING LOW ORDER, LINEAR, POSITIVE SPATIAL QUADRATURES FOR THE PARTIAL CURRENT NEUTRON TRANSPORT ...
... Title : Improving Low Order, Linear, Positive Spatial Quadratures for the Partial Current Neutron Transport Method. Descriptive Note : Master's thesis. ...
A Gaussian integration package was written for the IBM-7090. This package allows for the possibility of performing a four-fold integral and for an optional number of points in the Gaussian quadrature. (auth)
... SUBJECT TERMS ... the combination of high-order quadrature formulae, fast application of integral operators in Lippmann-Schwinger equations, and ...
... Title : Herriott Cell Augmentation of a Quadrature Heterodyne Interferometer. Corporate Author : AIR FORCE RESEARCH LAB EDWARDS AFB CA. ...
Gauss quadrature rules are given for numerically evaluating integrals on the interval [ 0, 11 for some weight functions of the form w(t) = t? ...
... In this design, the quadrature channel only is filtered as shown ... A filter which meets this requirement is ... for sixth order (7 tap) FIR Hilbert transformers ...
... (35) m=0 with (p, s) the spherical coordinates of the vector x- o ... Gaussian quadrature rule, which is the unique n-point quadrature rule that integrates ...
... combine incidence matrices, which admit Hermite-Birkhoff quadrature ... Mathematics), Integration, Configurations, Polynomials, Weighting functions,. ...
... parse control strings for memory I/0 using a method that in various ways mirrors' orthogonal quadrature signal filtering from wavelet theory (thus the ...
... Title : 2 FSK/QPSK (Frequency Shift Keying/Quadrature Phase Shift Keying) Transmitter and Receiver: Design and Performance. ...
... WAVE FUNCTIONS, *MATRIX THEORY, FOURIER TRANSFORMATION, POTENTIAL ENERGY, ELECTROSTATICS, GAUSSIAN QUADRATURE. ...
... TOPOLOGY, CONVERGENCE, POISSON EQUATION, GAUSSIAN QUADRATURE, THEOREMS, BANACH SPACE, MINKOWSKI SPACE. ...
... measured. The radii of the spheres were large compared to the wavelength, and their index of refraction was close to unity. ...
... INTERFACES, FORMULATIONS, INTEGRALS, VALUE, GAUSSIAN QUADRATURE, VARIATIONAL METHODS, APPROXIMATION(MATHEMATICS ...
... Accession Number : AD0696145. Title : ON IGNORING THE SINGULARITY IN NUMERICAL QUADRATURE. Corporate ...
... duplication of the cube and quadrature of the circle having been already accepted as contributions to science by the American Mathematical Monthly, ...
We construct efficient quadratures for the integration of polynomials over irregular convex polygons and polyhedrons based on moment fitting equations. The quadrature construction scheme involves the integration of monomial basis functions, which is performed using homogeneous quadratures with minimal number of integration points, and ...
The similarity of item and ability parameter estimations was investigated using two numerical analysis techniques via marginal maximum likelihood estimation (MMLE) with a large simulated data set (n=1,000 examinees) and changing the number of quadrature points. MMLE estimation uses a numerical analysis technique to integrate examinees' abilities over the ability distribution ...
ERIC Educational Resources Information Center
For many classical Gauss-Christoffel quadrature rules there does not exist a method which guarantees a uniform level of accuracy for the Gaussian quadrature weights at all quadrature nodes unless the nodes are known exactly. More disturbing, some algebraic expressions for these weights exhibit an excessive sensitivity to even the ...
The concept of Radau Quadrature is used to reduce the problem of finding the numerical solution of a linear differential equation to evaluations of the functions appearing in the differential equation and the solving of a system of linear algebraic equati...
The patent application relates to an a.c. coupled, low-pass translating filter in which quadrature phases of an input signal spectrum are, in three successive balanced modulator stages driven by quadrature phases of externally generated carrier signals, a...
The rates of convergence (or divergence) or Gaussian quadrature on functions with an algebraic or logarithmic singularity inside, or at an endpoint of, the interval of integration is obtained. Upper and lower bounds for the error in Gaussian integration w...
Generalized Gaussian quadratures appear to have been introduced by Markov late in the last century, and have been studied in great detail as a part of modern analysis. They have not been widely used as a computational tool, in part due to absence of effec...
In an earlier work, a far-reaching generalization of the classical Gaussian quadrature rules is introduced, replacing the polynomials with a wide class of functions. While the rules of in that report possess most of the desirable properties of the classic...
The n point Gauss quadrature formula is generalized to cover weighted integrals. Computer programs for generating the coefficients of the integration formulae for any given f(x) and w(x) are outlined, methods of handling point constraints and cases of fai...
Quadrature rules of the extended Clenshaw-Curtis (ECC) type are derived for integrands with trigonometric or hyperbolic weight functions. The study puts into evidence the existence of a fully analytic solution, in terms of hypergeometric functions /sub 0/...
