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論文名稱(外文):Performance Analysis and Design of Three-Dimensional Wavelength/Time/Spatial Coding over Optical CDMA Network
指導教授(外文):Jen-Fa HuangJen-Fa Huang
外文關鍵詞:Optical code-division multiple-access (OCDMA)multiuser interface (MUI)
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在我們的研究中,提出二種不同的三維混和碼及對應之編解碼器,將頻域/時域/ 空域之編碼,用於光分碼多工系統之數位及類比傳輸。此外,我們也將探討碼的相關性質、編碼碼器的設計以及系統效能。

The use of single-mode optical fiber in high bit-rate long-haul communication links has prevalent due to the low propagation loss and the large bandwidth available. The development of local area networks (LAN’s) using optical fiber is rapidly continuing. A crucial aspect of any network implementation is the system by which each user is allocated a share of the network resources. Optical code-division multiple-access (OCDMA) system is thought to be a more suitable solution in a local-area network, as it provides multiple users access the network asynchronously and simultaneously with high level transmission security [1-2]. Several methods have been proposed to achieve passive OCDMA. The conventional OCDMA system mainly has four kinds of schemes, namely time-spreading scheme, frequency-hopping scheme, spectral amplitude-coding (SAC) scheme, and spatial coding scheme.
It’s well known that the performance of OCDMA is mainly degraded by the interference from other simultaneous users, which is called multiuser interface (MUI). In the earlier OCDMA systems, an optical orthogonal code (OOC) is a collection of one-dimensional (1-D) binary sequences for OCDMA. To support many simultaneous users, the code needs provide good correlation properties. Such properties usually achieved through the use of very long code sequences. In other word, very large bandwidth expansion is required, creating a stringent requirement on speed of encoding and correlating hardware. To overcome this problem and hence multi-dimensional coding method such as two-dimensional (2-D) code and three-dimensional (3-D) code were then proposed .
In this study, we propose two new 3-D hybrid matrices and associated decoding scheme for a wavelength/time/spatial OCDMA systems used for digital and analog transmissions and we discuss code construction, code properties, system structure and system performance.

中文摘要 I
Chapter 1 Introduction 1
1.1 From Radio CDMA to Optical CDMA 1
1.2 The Development of OCDMA History 3
Chapter 2 Overviews on Optical CDMA Coding 5
2.1 Maximal-Length Sequence Codes 5
2.2 Complementary Walsh-Hadamard Codes 6
2.3 Modified Prime Codes 8
2.4 Modified Quadratic Congruence Codes 9
2.5 Carrier-Hopping Prime Codes 12
Chapter 3 Hybrid CHP/MP Coding 14
3.1 Code Construction and Code Properties 14
3.2 System Design 17
3.3 Performance Analysis 19
Chapter 4 Hybrid MQC/MQC/M-sequence Coding 22
4.1 Code Construction 22
4.2 System Design 22
4.3 Performance Analysis 24
4.4 Simulation 33
Chapter 5 Conclusions 35
Appendix i

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