J.A. Martin-Gonzalez, E. Poves, and F.J. Lopez-Hernandez (Spain)
Random optical codes (ROCs), optical codes, Generalized optical orthogonal codes, optical code-division multiple access (OCDMA), optical wireless networks.
In this paper, we study random optical codes (ROCs), which are intended to be used in Optical Code-Division Multiple-Access (OCDMA) systems. ROCs are codes which are selected randomly from all possible rearrange ments. Each bit is transmitted using a different code. The probability of error due to multiple-access inter ference is computed. It is validated by a comparison be tween theoretical and simulations results. Moreover the cross-correlation between two codes is also analyzed. The results are satisfactory for a system with long codes and a large number of users. However the simplic ity is the main advantage found in ROCs. The random se lection of pulse positions out of the length code is easily implementable. Furthermore, the parameter values can be optimized without design restrictions. Besides, this fam ily presents a huge cardinality which permits changing the code for each bit. The main contribution of this paper is the introduc tion of the dynamical accommodation to the actual number of users. It is possible using the simplicity provided by ROCs. Furthermore a comparison between OCDMA sys tems using ROCs and Generalized orthogonal optical codes is shown. A real application in an intra-satellite optical wireless network where ROCs features are used is also presented.
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