A NOVEL CONSTRUCTION OF VECTOR COMBINATORIAL (VC) CODE FAMILIES AND DETECTION SCHEME FOR SAC OCDMA SYSTEMS
There has been growing interests in using optical code division multiple access (OCDMA) systems for the next generation high-speed optical fiber networks. The advantage of spectral amplitude coding (SAC-OCDMA) over conventional OCDMA systems is that, when using appropriate detection technique, th...
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my-utp-utpedia.28972017-01-25T09:43:03Z http://utpedia.utp.edu.my/2897/ A NOVEL CONSTRUCTION OF VECTOR COMBINATORIAL (VC) CODE FAMILIES AND DETECTION SCHEME FOR SAC OCDMA SYSTEMS AHMED MOHMED, HASSAN YOUSIF There has been growing interests in using optical code division multiple access (OCDMA) systems for the next generation high-speed optical fiber networks. The advantage of spectral amplitude coding (SAC-OCDMA) over conventional OCDMA systems is that, when using appropriate detection technique, the multiple access interference (MAI) can totally be canceled. The motivation of this research is to develop new code families to enhance the overall performance of optical OCDMA systems. Four aspects are tackled in this research. Firstly, a comprehensive discussion takes place on all important aspects of existing codes from advantages and disadvantages point of view. Two algorithms are proposed to construct several code families namely Vector Combinatorial (VC). Secondly, a new detection technique based on exclusive-OR (XOR) logic is developed and compared to the reported detection techniques. Thirdly, a software simulation for SAC OCDMA system with the VC families using a commercial optical system, Virtual Photonic Instrument, “VPITM TransmissionMaker 7.1” is conducted. Finally, an extensive investigation to study and characterize the VC-OCDMA in local area network (LAN) is conducted. For the performance analysis, the effects of phase-induced intensity noise (PIIN), shot noise, and thermal noise are considered simultaneously. The performances of the system compared to reported systems were characterized by referring to the signal to noise ratio (SNR), the bit error rate (BER) and the effective power (Psr). Numerical results show that, an acceptable BER of 10−9 was achieved by the VC codes with 120 active users while a much better performance can be achieved when the effective received power Psr > -26 dBm. In particular, the BER can be significantly improved when the VC optimal channel spacing width is carefully selected; best performance occurs at a spacing bandwidth between 0.8 and 1 nm. The simulation results indicate that VC code has a superior performance compared to other reported codes for the same transmission quality. It is also found that for a transmitted power at 0 dBm, the BER specified by eye diagrams patterns are 10-14 and 10-5 for VC and Modified Quadratic Congruence (MQC) codes respectively. 2010 Thesis NonPeerReviewed application/pdf en http://utpedia.utp.edu.my/2897/1/Version4_TITLE_OF_THE_THESIS.pdf AHMED MOHMED, HASSAN YOUSIF (2010) A NOVEL CONSTRUCTION OF VECTOR COMBINATORIAL (VC) CODE FAMILIES AND DETECTION SCHEME FOR SAC OCDMA SYSTEMS. PhD thesis, UNIVERSITI TEKNOLOGI PETRONAS. |
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There has been growing interests in using optical code division multiple access
(OCDMA) systems for the next generation high-speed optical fiber networks. The
advantage of spectral amplitude coding (SAC-OCDMA) over conventional OCDMA
systems is that, when using appropriate detection technique, the multiple access
interference (MAI) can totally be canceled. The motivation of this research is to
develop new code families to enhance the overall performance of optical OCDMA
systems. Four aspects are tackled in this research. Firstly, a comprehensive discussion
takes place on all important aspects of existing codes from advantages and
disadvantages point of view. Two algorithms are proposed to construct several code
families namely Vector Combinatorial (VC). Secondly, a new detection technique
based on exclusive-OR (XOR) logic is developed and compared to the reported
detection techniques. Thirdly, a software simulation for SAC OCDMA system with
the VC families using a commercial optical system, Virtual Photonic Instrument,
“VPITM TransmissionMaker 7.1” is conducted. Finally, an extensive investigation to
study and characterize the VC-OCDMA in local area network (LAN) is conducted.
For the performance analysis, the effects of phase-induced intensity noise (PIIN), shot
noise, and thermal noise are considered simultaneously. The performances of the
system compared to reported systems were characterized by referring to the signal to
noise ratio (SNR), the bit error rate (BER) and the effective power (Psr). Numerical
results show that, an acceptable BER of 10−9 was achieved by the VC codes with 120
active users while a much better performance can be achieved when the effective
received power Psr > -26 dBm. In particular, the BER can be significantly improved
when the VC optimal channel spacing width is carefully selected; best performance
occurs at a spacing bandwidth between 0.8 and 1 nm. The simulation results indicate
that VC code has a superior performance compared to other reported codes for the
same transmission quality. It is also found that for a transmitted power at 0 dBm, the
BER specified by eye diagrams patterns are 10-14 and 10-5 for VC and Modified
Quadratic Congruence (MQC) codes respectively. |
format |
Thesis |
author |
AHMED MOHMED, HASSAN YOUSIF |
spellingShingle |
AHMED MOHMED, HASSAN YOUSIF A NOVEL CONSTRUCTION OF VECTOR COMBINATORIAL (VC) CODE FAMILIES AND DETECTION SCHEME FOR SAC OCDMA SYSTEMS |
author_facet |
AHMED MOHMED, HASSAN YOUSIF |
author_sort |
AHMED MOHMED, HASSAN YOUSIF |
title |
A NOVEL CONSTRUCTION OF VECTOR COMBINATORIAL (VC) CODE
FAMILIES AND DETECTION SCHEME FOR SAC OCDMA SYSTEMS |
title_short |
A NOVEL CONSTRUCTION OF VECTOR COMBINATORIAL (VC) CODE
FAMILIES AND DETECTION SCHEME FOR SAC OCDMA SYSTEMS |
title_full |
A NOVEL CONSTRUCTION OF VECTOR COMBINATORIAL (VC) CODE
FAMILIES AND DETECTION SCHEME FOR SAC OCDMA SYSTEMS |
title_fullStr |
A NOVEL CONSTRUCTION OF VECTOR COMBINATORIAL (VC) CODE
FAMILIES AND DETECTION SCHEME FOR SAC OCDMA SYSTEMS |
title_full_unstemmed |
A NOVEL CONSTRUCTION OF VECTOR COMBINATORIAL (VC) CODE
FAMILIES AND DETECTION SCHEME FOR SAC OCDMA SYSTEMS |
title_sort |
novel construction of vector combinatorial (vc) code
families and detection scheme for sac ocdma systems |
publishDate |
2010 |
url |
http://utpedia.utp.edu.my/2897/1/Version4_TITLE_OF_THE_THESIS.pdf http://utpedia.utp.edu.my/2897/ |
_version_ |
1739830973205315584 |
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13.160551 |