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Proceedings Paper

Efficiency of MIMO configuration and adaptive optics corrections in free space optical fading channels
Author(s): Zeinab Hajjarian; Mohsen Kavehrad; Jarir Fadlullah
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Paper Abstract

Free Space Optical (FSO) communications is the only practical candidate for realizing universal network coverage between ground and airborne nodes, satellites, and even moon and other nearby planets. When atmosphere (be it the earth or Mars) is a part of the optical channel, attributes of scattering and turbulence bring about amplitude attenuation, and scintillation, as well as beam wander and phase aberrations at the receiving aperture. Phase screens are usually used in order to simulate the atmospheric fading channel and phase fluctuations. In this paper, different methods of generating phase screens are compared based on their accuracy and computational complexity, as in most computer simulations, a large ensemble of phase screens are required for averaging purposes. To combat the focal plane intensity fading, caused by amplitude and phase variations in the received wave-front, it is possible to replace the Single Input-Single Output (SISO) communications system with its Multiple Input Multiple Output (MIMO) equivalent, which has the same total transmit power and receiving aperture area. Another alternative is to equip the receiver with a state of the art Adaptive Optics (AO) correction system. Using average Bit Error Rate (BER), as a performance metric, effectiveness of these two approaches are compared and it is shown that while a MIMO configuration outperforms a basic AO system capable of only tilt corrections, an ideal AO system, which is able to remove higher orders of Zernike modes can asymptotically perform as well as an equivalent MIMO configuration.

Paper Details

Date Published: 22 January 2010
PDF: 11 pages
Proc. SPIE 7620, Broadband Access Communication Technologies IV, 76200F (22 January 2010); doi: 10.1117/12.840427
Show Author Affiliations
Zeinab Hajjarian, The Pennsylvania State Univ. (United States)
Mohsen Kavehrad, The Pennsylvania State Univ. (United States)
Jarir Fadlullah, The Pennsylvania State Univ. (United States)

Published in SPIE Proceedings Vol. 7620:
Broadband Access Communication Technologies IV
Benjamin Dingel; Raj Jain; Katsutoshi Tsukamoto, Editor(s)

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