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Optimum code structures for positive optical CDMA using normalized divergence maximization criterion [electronic resource]

Mashhadi, S ; Sharif Unversity Of Technology

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  1. Type of Document: Article
  2. DOI: 10.1109/TCOMM.2008.060284
  3. Abstract:
  4. In this letter we consider optimum code structure for positive optical code division multiple-access (optical CDMA) systems. Positive systems are a class of systems that operate with positive real numbers only. We consider the effect of multipleaccess interference in our model and show that code design for both On-Off Keying (OOK) and Binary PPM optical CDMA systems results in the same solutions. Furthermore, we show that a class of codes known as optical orthogonal codes (OOCs) are the best possible positive codes. In obtaining the results we define normalized divergence based on signal-to-multipleaccess interference ratio (SIR) for a multiple-access system in a useful manner and use it as our criterion to maximize the multiple-access capability of the codes. Finally, we demonstrate that BPPM/OOC can be considered as the closest counterpart of plusmn1 pseudorandom sequence in radio CDMA communication systems
  5. Keywords:
  6. Amplitude shift keying ; Code division multiple access ; Interference suppression ; Optical communication ; Optimisation ; Orthogonal codes ; Pulse position modulation
  7. Source: IEEE Transactions on Communications ; Vol. 56, No. 9, PP. 1414-1421, September 2008
  8. URL: http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=4623794&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F26%2F4623786%2F04623794.pdf%3Farnumber%3D4623794