Development of Zero Cross Correlation-Double Weight Code for Optical CDMA

Elamin Idriss Babekir Idriss, Elamin Idriss (2007) Development of Zero Cross Correlation-Double Weight Code for Optical CDMA. Masters thesis, Universiti Teknologi Petronas.

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Optical fibers are very attractive communication media if compared to the
conventional guided media like twisted wire pairs and coaxial cables since they offer
large bandwidth and low attenuation. Hence, by utilizing optical fibers as the media of
communication links, more advantages can be obtained if compared to traditional
The three major multiple access for optical networks are Time Division Multiple
Accees (TDMA), Frequency Division Multiple Access (FDMA) and Code Division
Multiple Access (CDMA). OCDMA has advantages over TDMA and FDMA because
first of all it makes efficient use of communication media by allowing asynchronous
access to each user. Second no scheduling is required in CDMA and new users can
easily be added to the networks.
The Optical Code Division Multiple Access (OCDMA) suffers from various types of
noise but the dominant source of noise is Multiple Access Interference (MAI).
Therefore, the cancellation or suppression of MAI is a big problem in OCDMA.
Much OCDMA codes have been designed to reduce the MAI and to enhance the
performance of the system. This thesis concentrates on how to reduce the MAI in
In this thesis Zero Cross Correlation-Double Weight Code (ZCC-DW) is proposed
based on Modified Double Weight Code (MDW) for OCDMA system to decrease the
cross correlation value from one to zero hence the Multiple Access Interference
(MAI) should be decrease and this will improve the system performance.
After completion the code construction techniques a simulation is used to study the
performance of ZCC-DW code. The performance is carried out to various data rate
and various optical fiber lengths to calculate the Bit Error Rate (BER) which it used to
evaluate the code performance. Lastly Comparisons are then made between Direct
Detection (ZCC-DW code Detection) and Hybrid Detection (MDW code Detection).
Direct Detection Technique offers better result than Hybrid Detection Technique.

Item Type: Thesis (Masters)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments / MOR / COE:
Depositing User: Users 5 not found.
Date Deposited: 11 Jan 2012 12:18
Last Modified: 19 Jan 2017 15:50

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