Accession Number : AD0706292

Title :   EFFICIENT OPTICAL COMMUNICATION IN A TURBULENT ATMOSPHERE.

Descriptive Note : Technical rept.,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS

Personal Author(s) : Halme,Seppo J.

Report Date : 01 APR 1970

Pagination or Media Count : 125

Abstract : Given a transmitter that radiates an electromagnetic light field, it is assumed that the resulting field at the plane of the receiver aperture is log-normal with some coherence properties. Various representations of the field are discussed: aperture sampling, plane-wave decomposition, and Karhunen-Loeve expansion. The statistical properties of the coefficients in these representations are investigated by analytical, simulation, and experimental methods. Based on these representations the problem of optimum detection of an orthogonal signal set, subject to distortion and noise in the atmosphere, is investigated. The optimum receiver and its performance are evaluated and discussed in the cases of log-normal and Gaussian statistics, classical and quantum models, large and small apertures, and strong, weak or absent background noise. (Author)

Descriptors :   (*OPTICAL COMMUNICATIONS, ATMOSPHERIC MOTION), LIGHT TRANSMISSION, DETECTION, OPTIMIZATION, NOISE(RADIO), INFORMATION THEORY, LASERS, STATISTICAL DISTRIBUTIONS, PROBABILITY DENSITY FUNCTIONS, THESES

Subject Categories : Cybernetics
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE