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Transmission Analysis of Optical Code Division Multiple Access Communication Systems in the Presence of Noise in Local Area Network Applications

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Author(s): Ahmed Nabih Zaki Rashed | Mohamed M. Zahra | Mohamed Yassin | Ismail A. Abd El- Aziz | Shreen A.El-Bheiry

Journal: International Journal of Basics and Applied Science
ISSN 2301-4458

Volume: 1;
Issue: 4;
Start page: 745;
Date: 2013;
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Keywords: Shot noise | Thermal noise | BER | SNR | Received signal power | and Code length parameter

ABSTRACT
OCDMA is an essential part of the digital communication system now days for long haul, high speed networks. The biggest challenge with Optical CDMA system is to maintain the performance of the system and offer high bandwidth in case of higher number of users at minimum cost. As the number of users increase, the input requirements i.e. transmitted power, bit rate etc start increasing sharply which contribute to the additional cost. It has recently attracted significant research interest because of the advantages it offers in terms of the flexibility in the management of the system resources. We have taken into account the system design parameters are determined such as BER (bit error rate), signal to noise ratio (SNR), transmission bit rates, and optical received power for different code lengths. The Optical CDMA systems suffer from the problem of multiple access interference (MAI).As the number of users increase the BER error rate degrades because the effect of MAI (multiple access interference) increases. So, there is a limitation in number of users, as the number of users increase SNR decrease and probability of error increases.
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