Abstract
In this paper, we have proposed a novel spreading code-set based on
the prime code families, hereby referred to as “transposed sparse-padded
modified prime code” for synchronous optical code-division multiple-access
(OCDMA) networks. The proposed code-set is compared with modified prime codes
(MPCs) in terms of correlation properties, bit-error rate (BER), and cardinality.
This new low-weight large code-set has better correlation characteristics
as compared with MPC families and, as results indicated, the new code-set
has considerably improved the BER and power consumption of the OCDMA networks.
We have analyzed the performance of the proposed code-set in both incoherent
ON–OFF keying and pulse position modulation OCDMA systems, while the
multiple access interference was the major degrading quality. The results
indicate that at the BER floor of 10<sup>-9</sup>, the proposed code-set can accommodate greater number of users
and consume less power as compared with the MPC under the same transmission
conditions.
© 2012 IEEE
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