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Showing 1 to 20 of 309 for “"quadrature"”.
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Multidimensional Quadrature
… A basic adaptive algorithm for multidimensional quadrature is described and programs for both the simplex and the hypercube based on this are presented. The problems of testing and comparison of quadrature routines are discussed. Two alternative approaches to storing integrand evaluations are …
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Multidimensional Adaptive Quadrature Over Simplices
… and reliable multidi- mensional adaptive quadrature routines defined over simplices (MAQS). MAQS pro- vides an approximation to the integral of a function defined over the unit hypercube and provides an error estimate that is used to drive a global subdivision strategy. The quadrature …
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Trellis Coded Modulation Schemes Using A New Expanded 16-Dimensional Constant Envelope Quadrature-Quadrature Phase Shift Keying Constellation
… and analyzes two 4-dimensional Constant Envelope Quadrature-Quadrature Phase Shift Keying constellations. Optimal demodulators for the two constellations are presented, and one of them was designed and implemented by the author. In addition, a novel expanded 16-dimensional CEQ2PSK constellation …
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Integration of broadband direct-conversion quadrature modulators
… for integrated microwave transmitters. A quadrature modulator realizes the phasing method by combining signals phased at quadrature (i.e. at 90° offsets) to produce a single-sideband (SSB) output. In this way output filtering can be removed or its specifications greatly relieved so as to …
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Gaussian Quadrature for computer aided robust design
… but none have supplanted Monte Carlo. Gaussian Quadrature (GQ) is presented here as a new option with significant benefits for many types of engineering problems. Advantages of GQ include: as few as 2*(number of noise factors) simulation runs required to estimate performance mean and variance, …
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Quadrature-point stabilization of Mach-Zehnder interferometers
… there exists the inherent problem of quadrature-point stabilization. Presented here is a review of existing quadrature-point stabilization methods and experimental results concerning the application of one of them which uses a piezoelectric transducer in the reference arm of an …
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Difficulties with NTSC compatible quadrature digital data transmission
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1989.
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Adaptive multilevel quadrature amplitude radio implementation in programmable logic
… spectrally efficient modulation methods like Quadrature Amplitude Modulation (QAM) to increase the channel efficiency and maximize data throughput. Unfortunately, the performance of high level QAM modulations in the wireless channel is sensitive to channel imperfections and throughput is …
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Modeling amplitude-modulation atomic force microscopy using direct-quadrature transformation
The student, Yuchen Xu, accepted the attached license on 2020-04-29 at 12:03.
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A 1.6-3.2GHz, high phase accuracy quadrature phase locked loop
… PLL that has a very wide tuning range, accurate quadrature outputs, and is geared towards low phase noise. The VCO is identified as the limiting factor in the tuning range and source of the quadrature outputs, as well as the primary source of the phase noise above the loop bandwidth of the PLL, …
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A two axis mirror positioning system with quadrature encoder output
… feedback sensors were considered, and a quadrature encoder was chosen. To reduce cost, the encoder disk was made from an overhead transparency with a slotted image printed on it. The required encoder accuracy was 1.0 degree, and a measured accuracy of 0.85 degrees was achieved. The …
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Simulation of quadrature amplitude demodulation in a digital telemetry system
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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A quadrature-based technique for robust design with computer simulations
… This method is based on the Hermite-Gaussian quadrature for a single input. It is extended to multiple variables, in which case, for simulations with n randomly varying inputs, the method requires 4n + 1 samples. For situations in which the polynomial response is separable, it is proven that …
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Quadrature amplitude modulated codes for orthogonal frequency division multiplexing applications
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Approximation of Elements of Exponentials of Differential Operators With Rational Quadrature
<p>We explore the possibility of improving the accuracy of approximations of elements of exponentials of differential operators, by using a rational function, instead of a polynomial function, as the interpolating function. Since a rational function behaves more like a decaying exponential …
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5GHz CMOS resonant clock buffer with quadrature generation for fiber optic applications
… by additional variable capacitance, to deliver quadrature signals from a single incoming clock. The cost of this quadrature generation is added complexity of control algorithm and the advantage is 85% less power than alternate methods. This topology is used to create quadrature signals and drive …
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A hybrid quadrature mirror filter bank approach to analog-to-digital conversion
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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