# 臺灣博碩士論文加值系統

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 近年來由於二維編碼技術的發展,光纖網路技術開始受到新的關注。在本篇論文當中提出了一種新式二維光纖碼，此新二維光纖建立於以最大戶相關數值為二的光纖正交碼為時域展頻碼，此架構能夠提供更多的系統用戶數已致能容納更多同步使用者數且能提供更大的碼重而獲得更好的效能。於本論文最後，此新二維光纖碼與我們之前所提出的二維光纖碼做比較，從分析的結果也顯示出新的二維光纖碼比之前的架構有更好的表現。
 In this thesis, a new family of wavelength-time codes, which is based on one-dimensional optical orthogonal codes (1D OOCs) of cross-correlation functions of at most two, is proposed. By relaxing the maximum cross-correlation values to two, the new two-dimensional (2D) codes provide larger code cardinality for accommodating more subscribers and support heavier code weight for better code performance. The traditional chip-synchronous assumption used in the analyses of optical codes gives a pessimistic performance upper bound, while the newer chip-asynchronous assumption offers a more accurate performance. The performance of the new 2D codes is here analyzed under both assumptions for comparison. Under certain conditions, our results show that the new wavelength-time codes outperform our recently reported multiple-wavelength OOCs and 2D codes, which were based 1D OOCs of cross-correlation functions of at most one and two, respectively.
 Chapter 1 Introduction 11.1 Background 11.2 Fiber-Optic CDMA Communication System 21.3 Outline of Thesis 3Chapter 2 Construction of new 2D codes 52.1 Introduction 52.2 Basic algorithm 52.3 Construction of 2-D Code 72.4 Cardinality 82.5 Correlation Properties 10Chapter 3 Performance Analysis 123.1 Chip-Synchronous Assumption 123.1.1 Hit Probability for Odd Weight 133.1.2 Hit Probability for Even Weight 133.1.3 Error Probability Derivation 143.2 Chip-Asynchronous Assumption 153.3 Numerical Examples 16Chapter 44.1 Conclusions 284.2 Future Works 28Appendix I 29Appendix II 32References 34
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