Impact Of Temporal Fluctuations Of Signal-To-Noise Ratio (Burst Error) On Free-Space Laser Communications System Design

1986 ◽  
Author(s):  
Paul W. Scott ◽  
Philip W. Young
Keyword(s):  
System Design ◽  
Free Space ◽  
Signal To Noise Ratio ◽  
Signal To Noise ◽  
Temporal Fluctuations ◽  
Burst Error ◽  
Laser Communications ◽  
Noise Ratio ◽  
Communications System

scholarly journals Calculations of Signal to Noise Ratio (SNR) for Free Space Optical Communication Systems

2008 ◽  
Vol 5 (1) ◽  
pp. 95-100
Author(s):  
Baghdad Science Journal
Keyword(s):  
Optical Communication ◽  
Free Space ◽  
Communication Systems ◽  
Signal To Noise Ratio ◽  
Full Duplex ◽  
Free Space Optical ◽  
Signal To Noise ◽  
Optical Communication Systems ◽  
Space Optical Communication ◽  
Noise Ratio

In this paper, we calculate and measure the SNR theoretically and experimental for digital full duplex optical communication systems for different ranges in free space, the system consists of transmitter and receiver in each side. The semiconductor laser (pointer) was used as a carrier wave in free space with the specification is 5mW power and 650nm wavelength. The type of optical detector was used a PIN with area 1mm2 and responsively 0.4A/W for this wavelength. The results show a high quality optical communication system for different range from (300-1300)m with different bit rat (60-140)kbit/sec is achieved with best values of the signal to noise ratio (SNR).

scholarly journals Optimal Power Allocation Between Beam Tracking and Symbol Detection Channels in a Free-Space Optical Communications Receiver

2020 ◽  
Author(s):  
Muhammad Salman Bashir ◽  
Mohamed-Slim Alouini
Keyword(s):  
Power Allocation ◽  
Free Space ◽  
Signal To Noise Ratio ◽  
Optimal Power Allocation ◽  
Free Space Optical ◽  
Signal To Noise ◽  
Pointing Error ◽  
Optimal Power ◽  
Received Power ◽  
Noise Ratio

Free-space optical (FSO) communications will play an important role in the backhaul of future generation of wireless networks in order to support high data rates. Because of narrow beamwidth inherent to an optical signal, acquisition and tracking form an important component of any FSO communication system. In this study, we have analyzed the optimization of received power allocation between tracking and data channels in an FSO receiver. The objective function that is optimized (minimized) are the probability of error and the probability of outage, and the optimization of power allocation is carried out as a function of parameters such as noise power, pointing error variance, pointing error correlation coefficient, and the threshold of outage. We have analyzed the optimization concerning the lognormal and exponentiated Weibull fading scenarios as well. We learn that the optimal power allocation is a function of the received signal-to-noise ratio: a lower signal-to-noise ratio dictates that a higher fraction of received power should be diverted to the tracking channel and vice versa.

Fallacy and Fact of Sampled Imagery Displays

1974 ◽  
Vol 16 (3) ◽  
pp. 286-299 ◽  
Author(s):  
Lucien M. Biberman
Keyword(s):  
Spatial Frequency ◽  
System Design ◽  
Signal To Noise Ratio ◽  
Theoretical Work ◽  
Visual Performance ◽  
Design Criteria ◽  
Signal To Noise ◽  
Independent Variables ◽  
Noise Ratio

Factors long considered to be of primary importance to the visual performance of observers of displays of sampled imagery have been shown to be dependent upon, subordinate to, or no more important than other factors largely overlooked. In TV displays, for example, sharp raster lines, thought by many to be the hallmark of a good display, have been shown to interfere with the true image to form false images, and “shades of gray” and “resolution”, often treated as independent variables, have been shown to depend directly upon the signal-to-noise ratio in the imagery as a function of spatial frequency. Experimental and theoretical work in the area is briefly reviewed, and some implications for system design criteria are pointed out.

A process for free-space laser communications system design

2009 ◽  
Author(s):  
Frederick G. Walther ◽  
John D. Moores ◽  
Robert J. Murphy ◽  
Steven Michael ◽  
George A. Nowak
Keyword(s):  
System Design ◽  
Free Space ◽  
Laser Communications ◽  
Communications System
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