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TECHNIQUES FOR INCREASING NUMBER OF
USERS IN DYNAMICALLY RECONFIGURABLE
OPTICAL CODE DIVISION MULTIPLE ACCESS
SYSTEMS AND NETWORKS
by
Poorya Saghari
____________________________________________________
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(ELECTRICAL ENGINEERING)
December 2006
Copyright 2006 Poorya Saghari
Object Description
| Title | Techniques for increasing number of users in dynamically reconfigurable optical code division multiple access systems and networks |
| Author | Saghari, Poorya |
| Author email | saghari@usc.edu |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Electrical Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2006-10-27 |
| Date submitted | 2006 |
| Restricted until | Unrestricted |
| Date published | 2006-11-16 |
| Advisor (committee chair) | Willner, Alan E. |
| Advisor (committee member) |
O'Brien, John Huang, Ming-Deh |
| Abstract | The advances in long haul transmission and optical reach have shifted the bottleneck from the core network to metro and access networks. Optical access network is a promising solution to the already congested access network, advocating the fulfillment of the enormous future requirements of applications and Internet services of the next-generation on demand.; Optical code division multiple Access (O-CDMA) systems are possible strong candidate for future optical access network due to their enhanced data privacy, flexibility, and simplicity of network control, especially when considering the fine granularity of traffic, fine channel granularity; flexible bandwidth management, and ability to support variable Quality-of-Service (QoS).; One major challenge in O-CDMA systems results from the square detection in the optical receivers. Spreading sequences need to be designed in order to support unipolar signaling, hence, limiting the number of codes for a certain code parameters. In addition, the multiple-access-interference (MAI) caused by other users, limits the maximum number of users that can simultaneously operate in the system.; This thesis presents a detailed research on various system structures alleviating the effects of MAI. This paper presents an analytical model quantifying the MAI in the O-CDMA systems for various transmitter/receiver structures including conventional receiver, hard limiting receiver, and code position modulation (CPM) O-CDMA systems; relates the system performance to the MAI; experimentally demonstrates the effects of MAI on the threshold level and a novel technique to monitor the number of users in the system based on estimating the amount of MAI in the system; demonstrates a novel technique "code position modulation" and its variances "double pulse position modulation (2-PPM) and differential pulse position modulation (DPPM)" to increase the spectral efficiency of the system by a factor of 3; and finally introduces and demonstrates various techniques in order to enhance the O-CDMA network performance by enabling variable quality of service, variable bit rate, and interference avoidance.; The techniques presented in this thesis may potentially play key roles infuture dynamically reconfigurable optical code division multiple access systems andnetworks. |
| Keyword | optical communication; optical CDMA |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Type | texts |
| Legacy record ID | usctheses-m162 |
| Rights | Saghari, Poorya |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-Saghari-20061116 |
| Archival file | uscthesesreloadpub_Volume17/etd-Saghari-20061116.pdf |
Description
| Title | Page 1 |
| Full text | TECHNIQUES FOR INCREASING NUMBER OF USERS IN DYNAMICALLY RECONFIGURABLE OPTICAL CODE DIVISION MULTIPLE ACCESS SYSTEMS AND NETWORKS by Poorya Saghari ____________________________________________________ A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (ELECTRICAL ENGINEERING) December 2006 Copyright 2006 Poorya Saghari |
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