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Student Number 80345010
Author Shoou-Jeng Song(宋守正)
Author's Email Address No Public.
Statistics This thesis had been viewed 1769 times. Download 886 times.
Department Computer Science and Information Engineering
Year 1999
Semester 2
Degree Ph.D.
Type of Document Doctoral Dissertation
Language zh-TW.Big5 Chinese
Title Performance analysis of CDMA optical communication systems with various classes of codes
Date of Defense 2000-07-03
Page Count 85
Keyword
  • APD
  • CDMA
  • prime code
  • saddlepoint approximation
  • spread spectrum
  • Abstract Optical multiple-access systems using code-division multiple-access technique is investigated. The overall system performance is calculated for prime codes, QC codes, modified prime codes and modified Fibonacci prime codes. Theoretical analysis of the output current distribution of optical receivers with avalanche photodiode (APD) is developed. The mean and variance of the output statistics are presented. The bit error rate (BER) can be estimated by using the Gaussian approximation and saddlepoint approximation. The effects of the multiple-user interference, shot noise, and receiver thermal noise are investigated. From the numerical results we find that when the multiple-user interference increases, the saddlepoint approximation yields satisfactory results, but the Gaussian approximation yields higher BER floors.
    In this research we present two classes of modified prime codes with less weights and shorter lengths to improve the system performance. We also show the coding algorithm and the method for choosing the suitable optical codes for unsynchronous communication systems. We will show shown how to find the value of system parameters, such as the required signal strength, the APD gain and the decision level. Based on this research we present a realistically analytical method as an effective tool for the design of optical communication systems.
    Table of Content Cover
    論文提要
    ABSTRACT
    Contents
    Chapter 1 Introduction
    1.1 Motivation
    1.2 Fundamental concepts
    1.3 Dissertation organization
    Chapter 2 Code Design
    2.1 Introduction
    2.2 Prime codes
    2.3 Qc codes
    2.4 Modified prime codes
    2.5 Modified Fibonacci prime codes
    2.6 Comparison and choosing code sequence
    Chapter 3 System Model
    3.1 Introductino
    3.2 The transmitter model
    3.3 Statistic property of APD
    3.4 The receiver model
    Chapter 4 System Performance Analysis
    4.1 Introduction
    4.2 Computing the receiver output distribution
    4.3 The Gaussian approximation
    4.4 The saddlepoint approximation
    4.5 Optimum APD gain
    4.6 Optimum decisin level
    4.7 The bit ceeor floor
    4.8 Required signal strength
    Chapter 5 Numerical Results
    5.1 Introduction
    5.2 Estimation of bit error rate
    5.3 Comparison of bit error rate
    5.4 Comparison of threshold
    5.5 Fiding optimum APD gain
    5.6 Estimation of required signal strength
    Chapter 6 Conclusions
    References
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    Advisor
  • Chia-Lu Ho(賀嘉律)
  • Files
  • 80345010.pdf
  • approve immediately
    Date of Submission 2000-07-03

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