Abstract
Atmospheric turbulence is a major degrading factor in free-space optical (FSO) systems. Since turbulence-induced fading results in a very slowly-varying channel, reliable feedback is possible allowing the implementation of adaptive transmission in practical FSO systems. In this paper, we propose adaptive transmission algorithms in which transmit power and/or modulation size are varied according to the channel conditions. The design of adaptive algorithms is formulated as optimization problems of spectral efficiency and average power consumption at a targeted value of outage probability under peak power constraints. The proposed adaptive schemes bring significant improvements over their non-adaptive counterparts.
Original language | English (US) |
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Article number | 6302116 |
Pages (from-to) | 3808-3815 |
Number of pages | 8 |
Journal | IEEE Transactions on Communications |
Volume | 60 |
Issue number | 12 |
DOIs | |
State | Published - 2012 |
Keywords
- Free-space optical communications
- adaptive transmission
- fading channel
- pulse position modulation
ASJC Scopus subject areas
- Electrical and Electronic Engineering