COHERENT OPTICAL ARRAY RECEIVER FOR PPM SIGNALS UNDER ATMOSPHERIC TURBULENCE

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" COHERENT OPTICAL ARRAY RECEIVER FOR PPM SIGNALS UNDER ATMOSPHERIC TURBULENCE "

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	150129
Doc. No	:	ET21921
Main Entry	:	Michela Mufioz Fernhndez
Title Proper	:	COHERENT OPTICAL ARRAY RECEIVER FOR PPM SIGNALS UNDER ATMOSPHERIC TURBULENCE
Note	:	This document is digital این مدرک بصورت الکترونیکی می باشد
Abstract	:	The performance of a coherent fiee-space optical communications system operating inthe presence of turbulence is investigated. Maximum Likelihood Detection techniquesare employed to optimally detect Pulse Position Modulated signals with a focal-planedetector array and to reconstruct the turbulencedegraded signals.Laboratory equipment and experimental setup used to carry out these experimentsat the Jet Propulsion Laboratory are described. The key components include two lasersoperating at 1064 nm wavelength for use with coherent detection, a 16 element (4 X 4)InGaAs focal-plane detector array, and a data-acquisition and signal-processing assemblyneeded to sample and collect the data and analyze the results. The detected signals arecombined using the least-mean-square (LMS) algorithm. In the first part of theexperimental results we show convergence of the algorithm for experimentally obtained,..tested for theQ1 PC1 bus cardBoth these projects mere sofixare des elopment efforts tonards contributing to dlfferentaspects of Roboucs and lZ1echatronics projects m the Controls and Roboucs Group..
Subject	:	Electericl tess
	:	برق
electronic file name	:	TL45115.pdf
Title and statement of responsibility and	:	COHERENT OPTICAL ARRAY RECEIVER FOR PPM SIGNALS UNDER ATMOSPHERIC TURBULENCE [Thesis]