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Atmospheric optical CDMA via optical orthogonal codes

Jazayerifar, M ; Sharif University Of Technology

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  1. Type of Document: Article
  2. DOI: 10.1109/TCOMM.2006.881245
  3. Abstract:
  4. 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
  5. Keywords:
  6. Chip-level detector ; Free-space optical (FSO) ; Optical code-division multiple access (OCDMA) ; Scintillatio ; Turbulence
  7. Source: IEEE Transactions on Communication ; Vol.54, No.9, PP. 1614-1623, September 2006
  8. URL: http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=1703819&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F26%2F35956%2F01703819.pdf%3Farnumber%3D1703819