Development of novel ocdma codes for FTTH network

Optical Code Division Multiple Access (OCDMA) technique enables many subscribers to share a network simultaneously and asynchronously by allocating a specific code to each subscriber. The Multiple Access Interference (MAI) is considered as the dominant degradation factor in the OCDMA system. Intelli...

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Main Author:	Thana, Hussein Abd
Format:	Thesis
Language:	English
Subjects:	FTTH access network Optical Code Division Multiple Access (OCDMA) Multiple Access Interference (MAI) Multi Diagonal (MD) Dynamic Cyclic Shift (DCS)
Online Access:	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/33151/1/p%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/33151/2/Full%20text.pdf
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spelling	my-unimap-331512014-03-27T03:02:55Z Development of novel ocdma codes for FTTH network Thana, Hussein Abd Optical Code Division Multiple Access (OCDMA) technique enables many subscribers to share a network simultaneously and asynchronously by allocating a specific code to each subscriber. The Multiple Access Interference (MAI) is considered as the dominant degradation factor in the OCDMA system. Intelligent code sequence design is important to reduce the contribution of MAI. Over the last decade, many codes were proposed for the OCDMA. However, these codes have several restrictions on choosing the code parameters (code length, weight, cross-correlation properties). In addition, the number of accommodating users is severally limited. In this thesis two novel codes, namely Multi Diagonal (MD) and Dynamic Cyclic Shift (DCS) code have been proposed for the OCDMA system, to suppress the MAI consequently mitigate the phase induced intensity noise (PIIN), accommodate large number of users and enhanced the optical network capacity. The DCS code have been developed based on cyclic shift and Galois field method to obtain low cross-correlation property and minimise the code length with low weight value. On the other hand, MD code was developed based on multi diagonal matrixes to achieve zero cross-correlation property which significantly contributes to the elimination of the MAI and thus improved system performance of OCDMA network. The study of both codes, firstly derived mathematically, and subsequently carried out using simulation experiment utilizing optical simulator OptisystemTM version 9.0. The study focused on the effect of distance, bit rate, data modulation format, input power, chip spacing and amplifier ratio on the systems performance. The DCS code has been compared with codes that have cross-correlation value between their code words such as Modified Quadratic Congruence, (MQC), Modified Frequency Hopping (MFH), Enhanced Double Weight (EDW) and Modified Double Weight (MDW) codes. The DCS code showed the ability to accommodate a higher number of simultaneously users. This code could support 160 users simultaneously, carrying out 622Mb/s with a permissible bit error rate of 10-11. Power required was lower at the photo detector which means the detection system required less power by applying DCS code. Accordingly, the MD code system showed better performance than the former codes with zero cross-correlation property such as Zero Cross-correlation (ZCC) and Random Diagonal (RD) codes. It could accommodate 240 simultaneous users with 2.5 Gb/s at low transmitting power comparing to the 160 active user of the ZCC code at the same transmitting date rate. The development of the DCS and MD code has contributed to the OCDMA system improvement by reducing the cross-correlation value between code words and thus mitigating the PIIN. By adapting these codes in the OCDMA network, larger number of users can be accommodated with lower system complexity. Universiti Malaysia Perlis (UniMAP) 2013 Thesis en http://dspace.unimap.edu.my:80/dspace/handle/123456789/33151 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/33151/1/p%201-24.pdf 0aa131252ef8976058b091b15a3c09f3 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/33151/2/Full%20text.pdf 240f6cd6041a26e33ecf6ccf25a68cd7 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/33151/3/license.txt 8a4605be74aa9ea9d79846c1fba20a33 FTTH access network Optical Code Division Multiple Access (OCDMA) Multiple Access Interference (MAI) Multi Diagonal (MD) Dynamic Cyclic Shift (DCS) School of Computer and Communication Engineering
institution	Universiti Malaysia Perlis
collection	UniMAP Institutional Repository
language	English
topic	FTTH access network Optical Code Division Multiple Access (OCDMA) Multiple Access Interference (MAI) Multi Diagonal (MD) Dynamic Cyclic Shift (DCS)
spellingShingle	FTTH access network Optical Code Division Multiple Access (OCDMA) Multiple Access Interference (MAI) Multi Diagonal (MD) Dynamic Cyclic Shift (DCS) Thana, Hussein Abd Development of novel ocdma codes for FTTH network
description	Optical Code Division Multiple Access (OCDMA) technique enables many subscribers to share a network simultaneously and asynchronously by allocating a specific code to each subscriber. The Multiple Access Interference (MAI) is considered as the dominant degradation factor in the OCDMA system. Intelligent code sequence design is important to reduce the contribution of MAI. Over the last decade, many codes were proposed for the OCDMA. However, these codes have several restrictions on choosing the code parameters (code length, weight, cross-correlation properties). In addition, the number of accommodating users is severally limited. In this thesis two novel codes, namely Multi Diagonal (MD) and Dynamic Cyclic Shift (DCS) code have been proposed for the OCDMA system, to suppress the MAI consequently mitigate the phase induced intensity noise (PIIN), accommodate large number of users and enhanced the optical network capacity. The DCS code have been developed based on cyclic shift and Galois field method to obtain low cross-correlation property and minimise the code length with low weight value. On the other hand, MD code was developed based on multi diagonal matrixes to achieve zero cross-correlation property which significantly contributes to the elimination of the MAI and thus improved system performance of OCDMA network. The study of both codes, firstly derived mathematically, and subsequently carried out using simulation experiment utilizing optical simulator OptisystemTM version 9.0. The study focused on the effect of distance, bit rate, data modulation format, input power, chip spacing and amplifier ratio on the systems performance. The DCS code has been compared with codes that have cross-correlation value between their code words such as Modified Quadratic Congruence, (MQC), Modified Frequency Hopping (MFH), Enhanced Double Weight (EDW) and Modified Double Weight (MDW) codes. The DCS code showed the ability to accommodate a higher number of simultaneously users. This code could support 160 users simultaneously, carrying out 622Mb/s with a permissible bit error rate of 10-11. Power required was lower at the photo detector which means the detection system required less power by applying DCS code. Accordingly, the MD code system showed better performance than the former codes with zero cross-correlation property such as Zero Cross-correlation (ZCC) and Random Diagonal (RD) codes. It could accommodate 240 simultaneous users with 2.5 Gb/s at low transmitting power comparing to the 160 active user of the ZCC code at the same transmitting date rate. The development of the DCS and MD code has contributed to the OCDMA system improvement by reducing the cross-correlation value between code words and thus mitigating the PIIN. By adapting these codes in the OCDMA network, larger number of users can be accommodated with lower system complexity.
format	Thesis
author	Thana, Hussein Abd
author_facet	Thana, Hussein Abd
author_sort	Thana, Hussein Abd
title	Development of novel ocdma codes for FTTH network
title_short	Development of novel ocdma codes for FTTH network
title_full	Development of novel ocdma codes for FTTH network
title_fullStr	Development of novel ocdma codes for FTTH network
title_full_unstemmed	Development of novel ocdma codes for FTTH network
title_sort	development of novel ocdma codes for ftth network
granting_institution	Universiti Malaysia Perlis (UniMAP)
granting_department	School of Computer and Communication Engineering
url	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/33151/1/p%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/33151/2/Full%20text.pdf
_version_	1747836804854185984

Development of novel ocdma codes for FTTH network

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