Abstract
A novel spreading code-set based on the prime code (PC) families, referred
to as ‘transposed modified prime codes (T-MPC)’, is
proposed for synchronous optical code-division multiple-access (OCDMA)
networks. The new code-set is constructed algorithmically to enhance and
simplify its implementation. The proposed code-set performance is compared
with existing spreading code families in terms of correlations, bit-error
rate (BER) and cardinality. The proposed optical spreading code family
doubles the cardinality as compared to existing PC families. This also
implies that greater number of users can be accommodated in the network.
Since there is no longer a time-shift feature in T-MPC like in conventional
modified prime codes (MPC), the code is not predictable and thus even more
secure. However, the code structure is similar to MPC, thus its employment
in a system running MPC will be nondestructive. The code is also compatible
with low-weight MPC. The results indicate that the proposed code-set has
properties to enhance the OCDMA network capacity remarkably.
© 2010 IEEE
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