DocumentCode :
1263542
Title :
Further results on the capacity of free-space optical channels in turbulent atmosphere
Author :
Gappmair, Wilfried
Author_Institution :
Inst. of Commun. Networks & Satellite Commun., Graz Univ. of Technol., Graz, Austria
Volume :
5
Issue :
9
fYear :
2011
fDate :
6/1/2011 12:00:00 AM
Firstpage :
1262
Lastpage :
1267
Abstract :
In recent studies, the average capacity for optimal rate adaptation (ORA) of free-space optical channels in turbulent atmosphere has been derived in closed form, mainly based on the application of Meijer´s G-function. To this end, the channel was assumed to be memoryless, stationary and ergodic, with independent and identically distributed fading statistics. It was also assumed that scintillations follow a gamma´gamma distribution so as to appropriately describe moderate-to-strong turbulence conditions. In the current contribution, the author will extend this work in two aspects: (i) using the properties of Meijer´s G-function, it is shown that the average capacity provides also a closed-form solution for adaptation policies other than ORA, namely optimal power and rate adaptation, channel inversion with fixed rate and truncated channel inversion with fixed rate; (ii) if the additional loss caused by a misalignment between transmitter and receiver (pointing error) is taken into account, it is demonstrated that the developed analytical framework applies straightforwardly.
Keywords :
optical communication; optical links; FSO links; Meijer G-function; ORA; channel inversion; free-space optical channel; gamma-gamma distribution; identically distributed fading statistics; optimal rate adaptation; scintillations; turbulent atmosphere;
fLanguage :
English
Journal_Title :
Communications, IET
Publisher :
iet
ISSN :
1751-8628
Type :
jour
DOI :
10.1049/iet-com.2010.0172
Filename :
5936940
Link To Document :
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