臺灣博碩士論文加值系統

在多媒體光纖分碼多工系統中，如何利用功率及碼重的控制來達到各種服務品質需求為重要的課題。在本篇論文中，我們提出一個可調整功率的多碼重光纖分碼多工系統架構，並推導出一具任意最大互相關值之雙碼重光纖碼的整體系統效能分析模型。我們的結果顯示，雙碼重光纖分碼多工系統效能可以利用調整碼重和功率的方式，達到不同的服務品質需求。我們的數值分析也顯示，最大互相關值為二之雙碼重光纖碼的系統效能近乎於最大互相關值為一之雙碼重光纖碼，同時可提供更多的使用者。整體系統效能分析模型並可應用於功率感測，如光纖網路的服務中之監控、光纖網路中之故障監視，以及採用光纖碼的光纖感測系統之感測辨識。

In this paper, the use of power and weight control in multimedia, variable quality-of-services (QoS) optical code-division multiple-access (O-CDMA) systems is studied. An adjustable-power and variable-weight O-CDMA architecture is presented and the general performance model of double-weight optical codes with an arbitrary maximum cross-correlation value is formulated as functions of code weight and chip power. Our results show that the performance of double-weight codes can be fine-tuned by varying both code weight and power, and they play different roles in the QoS differentiation. From the numerical examples, we show that maximum cross-correlation value=2 double-weight codes can perform as good as their maximum cross-correlation value=1 counterparts and, at the same time, have the advantage of supporting more possible subscribers. This general analytical model is important for power-sensitive applications, such as in-service monitoring and fiber-fault surveillance in optical networks and sensor-identification in fiber-sensor systems with the use of optical codes.

Abstract ii
Contents iii
List of Figures iv
Chapter 1 Introduction 1
1.1 Background 1
1.2 Motivation and Outline of Thesis 2
Chapter 2 Power Control in Variable-Weight O-CDMA 4
2.1 Adjustable-Power and Variable-Weight O-CDMA Architecture 4
2.2 Effect of Power Control in Variable-Weight Codes 7
Chapter 3 Analysis of Adjustable-Power, Double-Weight Codes with Arbitrary λc 10
Chapter 4 Case Studies of Differential-QoS, Double-Weight O-CDMA with Power Control 18
Chapter 5 Conclusions 27

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