Low SNR Capacity of FSO Links over Gamma-Gamma Atmospheric Turbulence Channels

Author

Benkhelifa, Fouad ; Rezki, Zouheir ; Alouini, Mohamed-Slim

Author_Institution

Comput., Electr. & Math. Sci. & Eng. (CEMSE) Div., King Abdullah Univ. of Sci. & Technol. (KAUST), Thuwal, Saudi Arabia

Volume

17

Issue

6

fYear

2013

fDate

Jun-13

Firstpage

1264

Lastpage

1267

Abstract

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.

Keywords

atmospheric turbulence; fading channels; feedback; on-off control; optical control; optical links; power control; FSO links; ergodic capacity scales; free space optical communication systems; gamma-gamma atmospheric turbulence fading channels; low SNR capacity; low signal-to-noise ratio range; on-off power control scheme; one-bit CSI feedback; perfect channel state information; Fading; Optical feedback; Optical receivers; Optical transmitters; Radio frequency; Signal to noise ratio; FSO; Gamma-Gamma distribution; On-Off power control; ergodic capacity; low SNR; water filling;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2013.043013.130119

Filename

6515209