Efficiency of MIMO configuration and adaptive optics corrections in free space optical fading channels

Zeinab Hajjarian, Mohsen Kavehrad, Jarir Fadlullah

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish (US)
Title of host publicationBroadband Access Communication Technologies IV
Volume7620
DOIs
StatePublished - Mar 22 2010
EventBroadband Access Communication Technologies IV - San Francisco, CA, United States
Duration: Jan 27 2010Jan 28 2010

Other

OtherBroadband Access Communication Technologies IV
CountryUnited States
CitySan Francisco, CA
Period1/27/101/28/10

Fingerprint

MIMO (control systems)
Adaptive optics
Adaptive Optics
Free Space
fading
Fading Channels
adaptive optics
Multiple-input multiple-output (MIMO)
Fading channels
optics
Configuration
configurations
apertures
free-space optical communication
combat
Moon
Scintillation
natural satellites
Planets
Optical communication

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Hajjarian, Z., Kavehrad, M., & Fadlullah, J. (2010). Efficiency of MIMO configuration and adaptive optics corrections in free space optical fading channels. In Broadband Access Communication Technologies IV (Vol. 7620). [76200F] https://doi.org/10.1117/12.840427
Hajjarian, Zeinab ; Kavehrad, Mohsen ; Fadlullah, Jarir. / Efficiency of MIMO configuration and adaptive optics corrections in free space optical fading channels. Broadband Access Communication Technologies IV. Vol. 7620 2010.
@inproceedings{e6ca62a2cba248cfaf28e8c0c545fb4f,
title = "Efficiency of MIMO configuration and adaptive optics corrections in free space optical fading channels",
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.",
author = "Zeinab Hajjarian and Mohsen Kavehrad and Jarir Fadlullah",
year = "2010",
month = "3",
day = "22",
doi = "10.1117/12.840427",
language = "English (US)",
isbn = "9780819480163",
volume = "7620",
booktitle = "Broadband Access Communication Technologies IV",

}

Hajjarian, Z, Kavehrad, M & Fadlullah, J 2010, Efficiency of MIMO configuration and adaptive optics corrections in free space optical fading channels. in Broadband Access Communication Technologies IV. vol. 7620, 76200F, Broadband Access Communication Technologies IV, San Francisco, CA, United States, 1/27/10. https://doi.org/10.1117/12.840427

Efficiency of MIMO configuration and adaptive optics corrections in free space optical fading channels. / Hajjarian, Zeinab; Kavehrad, Mohsen; Fadlullah, Jarir.

Broadband Access Communication Technologies IV. Vol. 7620 2010. 76200F.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - Efficiency of MIMO configuration and adaptive optics corrections in free space optical fading channels

AU - Hajjarian, Zeinab

AU - Kavehrad, Mohsen

AU - Fadlullah, Jarir

PY - 2010/3/22

Y1 - 2010/3/22

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=77949429669&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77949429669&partnerID=8YFLogxK

U2 - 10.1117/12.840427

DO - 10.1117/12.840427

M3 - Conference contribution

SN - 9780819480163

VL - 7620

BT - Broadband Access Communication Technologies IV

ER -

Hajjarian Z, Kavehrad M, Fadlullah J. Efficiency of MIMO configuration and adaptive optics corrections in free space optical fading channels. In Broadband Access Communication Technologies IV. Vol. 7620. 2010. 76200F https://doi.org/10.1117/12.840427