Statistical communication theory
Decision theory and binary detection of signal transmission in noisy channel, and determination of noise caused by tape in magnetic recording system
DECISION THEORY↗
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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Power processing
Processing of electric power has been presented as a discipline that draws on almost every field of electrical engineering, including system and control theory, communications theory, electronic network design, and power component technology. The cost of power processing equipment, which often equals that of expensive, sophisticated, and unconventional sources of electrical energy, such as solar batteries, is a significant consideration in the choice of electric power systems.
Schwarz, F. C.↗
Research Progress Semiannual Status Report, Apr. 1 - Sep. 30, 1966
Space communications theory
COMMUNICATION THEORY↗
Possible areas of control theory in print communication
Control theory application in news magazine publishing
Hallenbeck, J. L.↗
Block-coded communications
Theory for block-coded telemetry systems is useful in testing performance of one- and two-way, phase-coherent telemetry systems when double-conversion, superheterodyne, phase-locked receiver, preceded by bandpass limiter is used to track carrier.
Lindsey, W. C.↗
An experimental facility for sequential decoding Technical report no. 450
Experimental facility system design for sequential decoding used in communication theory
SYSTEMS DESIGN↗
<a review of the research activities on radio physics, plasma dynamics, and communication sciences and engineering< quarterly progress report no. 72 <for period ending nov. 30, 1963<
Radiophysics, plasma dynamics, and communications theory
COMMUNICATION THEORY↗
Communication sciences Semiannual report, 1 Jul. - 31 Dec. 1965
Statistical communication theory for learning and adaptive system programs, and signal design
MACHINE LEARNING↗
Process analysis and synthesis
Perception and recognition with respect to communications theory - handwriting simulation
RECOGNITION↗
Research Laboratory of Electronics Quarterly progress report no. 80
University programs on plasma dynamics, communication theory, information processing, and neurophysiology
INFORMATION PROCESSING↗
Study of optimum methods of optical communication
Optimum methods of optical communication accounting for the effects of the turbulent atmosphere and quantum mechanics, both by the semi-classical method and the full-fledged quantum theoretical model are described. A concerted effort to apply the techniques of communication theory to the novel problems of optical communication by a careful study of realistic models and their statistical descriptions, the finding of appropriate optimum structures and the calculation of their performance and, insofar as possible, comparing them to conventional and other suboptimal systems are discussed. In this unified way the bounds on performance and the structure of optimum communication systems for transmission of information, imaging, tracking, and estimation can be determined for optical channels.
Harger, R. O.↗
Reduced electrical bandwidth receivers for direct detection 4-ary PPM optical communication intersatellite links
One of the major sources of noise in a direct detection optical communication receiver is the shot noise due to the quantum nature of the photodetector. The shot noise is signal dependent and is neither Gaussian nor wide sense stationary. When a photomultiplier tube (PMT) or an avalanche photodiode (APD) is used, there is also a multiplicative excess noise due to the randomness of the internal photodetector gain. Generally speaking, the radio frequency (RF) communication theory cannot be applied to direct detection optical communication systems because noise in RF communication systems is usually additive and Gaussian. A receiver structure which is mathematically optimal for signal dependent shot noise is derived. Several suboptimal receiver structures are discussed and compared with the optimal receiver. The objective is to find a receiver structure which is easy to implement and gives close to optimal performance.
Davidson, Frederic M.↗
On the assessment of visual communication by information theory
This assessment of visual communication integrates the optical design of the image-gathering device with the digital processing for image coding and restoration. Results show that informationally optimized image gathering ordinarily can be relied upon to maximize the information efficiency of decorrelated data and the visual quality of optimally restored images.
Huck, Friedrich O.↗
Second International Workshop on Harmonic Oscillators
The Second International Workshop on Harmonic Oscillators was held at the Hotel Hacienda Cocoyoc from March 23 to 25, 1994. The Workshop gathered 67 participants; there were 10 invited lecturers, 30 plenary oral presentations, 15 posters, and plenty of discussion divided into the five sessions of this volume. The Organizing Committee was asked by the chairman of several Mexican funding agencies what exactly was meant by harmonic oscillators, and for what purpose the new research could be useful. Harmonic oscillators - as we explained - is a code name for a family of mathematical models based on the theory of Lie algebras and groups, with applications in a growing range of physical theories and technologies: molecular, atomic, nuclear and particle physics; quantum optics and communication theory.
Han, Daesoo↗
Communications and tracking
Many phases of communications theory and practice could not be touched upon in this presentation. It is hoped that these objectives have been obtained: to show how, in a general way, it is possible to get back enough information to Justify a space vehicle; to show how the path of this vehicle may be followed from the ground, and to state some of the obstacles to communications over very long distances.
P A Gainer↗
A note on signal enhancement for dual magnetometer systems.
Demonstration of the value of cross-correlation signal enhancement achieved by means of a dual magnetometer system. A unique feature of a dual magnetometer system is, as pointed out by Ness et al. (1971), the opportunity it allows for signal enhancement by using cross-correlation techniques developed in statistical communication theory. Their use is shown to make it possible to overcome the limitations that the intrinsic sensor ambient noise and the measurement-contaminating spacecraft field fluctuations impose upon the signal detection performance of a single magnetometer.
Ness, N. F.↗