Low SNR Capacity of FSO Links over Gamma-Gamma Atmospheric Turbulence Channels
- Resource Type
- Authors
- Zouheir Rezki; Mohamed-Slim Alouini; Fatma Benkhelifa
- Source
- IEEE Communications Letters. 17:1264-1267
- Subject
- Physics
Transmitter
Topology
Computer Science Applications
Channel state information
Control theory
Modeling and Simulation
Range (statistics)
Ergodic theory
Fading
Electrical and Electronic Engineering
Focus (optics)
Computer Science::Information Theory
Free-space optical communication
Power control
- Language
- ISSN
- 1089-7798
In this paper, we study the ergodic capacity of free space optical communication systems over Gamma-Gamma atmospheric turbulence fading channels with perfect channel state information at both the transmitter and the receiver. In our framework, we mainly focus on the low signal-to-noise ratio range and show that the ergodic capacity scales proportionally to SNR log4(1/SNR). We show also that one-bit CSI feedback at the transmitter is enough to achieve this capacity using an on-off power control scheme.