Abstract
In this paper, we analyze and obtain performance of a multilevel Optical
Code Division Multiple Access (OCDMA) system with Variable-Weight Optical
Orthogonal Codes (VW-OOCs) under the same-bit-energy assumption. The exact
error-probability of this system is derived for the Generalized VW-OOCs (codes
with arbitrary cross-correlation) which is necessary for the optimum design
of multilevel OCDMA systems. We show that the bit power has an important role
on determining the performance of codes with different weights. Furthermore,
the results reveal that the performance of low-weight codes depends on the
weight of the low-weight codes and the code-weight ratio of two classes. Moreover,
our exact analytical model has resulted in more accurate performance analysis
than the upper bound in .
We have found that the accuracy of the upper bound decreases when the number
of simultaneously transmitting high-weight codes increases.
© 2013 IEEE
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