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Optimum code structures for positive optical CDMA using normalized divergence maximization criterion

Mashhadi, S ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. DOI: 10.1109/TCOMM.2008.060284
  3. Publisher: 2008
  4. Abstract:
  5. 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 ±1 pseudorandom sequence in radio CDMA communication systems. © 2008 IEEE
  6. Keywords:
  7. Code division multiple access ; Codes (standards) ; Codes (symbols) ; Communication systems ; Data communication systems ; Multiple access interference ; Number theory ; Optical communication ; Radio communication ; Radio systems ; Structural optimization ; Turbulent flow ; CDMA communication systems ; Code designs ; Code structures ; Divergence ; Interference ratio ; Multiple accessing ; Multiple-access systems ; On-Off keying ; Optical CDMA ; Optical code ; Optical orthogonal (OOC) ; Optical orthogonal codes ; Positive codes and systems ; Positive real ; Positive systems ; Pseudo-random sequences ; SIR ; Optical systems
  8. Source: IEEE Transactions on Communications ; Volume 56, Issue 9 , 2008 , Pages 1414-1421 ; 00906778 (ISSN)
  9. URL: https://ieeexplore.ieee.org/document/4623794