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Atmospheric optical CDMA communication systems via optical orthogonal codes

Jazayerifar, M ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. DOI: 10.1109/TCOMM.2006.881245
  3. Publisher: 2006
  4. Abstract:
  5. We propose and consider using a class of multiple-access sequences, namely, optical orthogonal codes (OOCs) in atmospheric optical code-division multiple-access systems. We obtain analytical solutions to the error probability for various channel models using positive-intrinsic-negative diode and avalanche photodiode photodetectors. In our analysis, the effects of atmospheric turbulence, ambient light, thermal noise, and multiuser interference are considered, in the context of a semiclassical photon-counting approach. The performance of the systems taking advantage of space diversity and error-correcting codes are also evaluated. Two common and widely used optical modulations, on-off keying and pulse-position modulation, are considered. Receiver structures based on correlator and chip level are used for OOC detection. Unlike the traditional chip-level receiver, here a generalized form of chip-level structure with two threshold levels is considered. Upper and lower bounds on the error probability for the above-chip-level receiver structure is obtained. From our analytical results, we can deduce that the chip-level receiver outperforms a simple correlator in the absence or weak atmospheric fading; however, in a strong fading environment, the simple correlator outperforms the chip-level receiver. © 2006 IEEE
  6. Keywords:
  7. Atmospheric optics ; Code division multiple access ; Correlators ; Diversity reception ; Error correction ; Errors ; Fading (radio) ; Light modulation ; Probability ; Scintillation ; Atmospheric optical code division multiple access systems ; Chip-level detector ; Free-space optical ; On-off keying ; Optical orthogonal codes ; Space diversity ; Optical communication
  8. Source: IEEE Transactions on Communications ; Volume 54, Issue 9 , 2006 , Pages 1614-1623 ; 00906778 (ISSN)
  9. URL: https://ieeexplore.ieee.org/document/1703819