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研究生:林哲立
研究生(外文):Che-Li Lin
論文名稱:光纖分碼多工擷取系統之研究
論文名稱(外文):Investigation on Fiber-Optic CDMA Technology
指導教授:吳靜雄
指導教授(外文):Jingshown Wu
學位類別:博士
校院名稱:國立臺灣大學
系所名稱:電機工程學研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:1999
畢業學年度:87
語文別:英文
論文頁數:119
中文關鍵詞:光纖通訊展頻通訊分碼多工質數碼光正交碼
外文關鍵詞:fiber-opticcommunicationspread spctrumcode division multiple accessprime codeoptical orthogonal code
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在本論文中我們提出了多種新式光纖分碼多工擷取系統的架構。為了改善同步式系統的效能,我們提出了一個包含適應性硬式光箝制器(adaptive optical hardlimiter)的接收機架構。藉由偵測一個位元週期中的光能量值以評估系統同時使用者人數,並進而正確地設定適應性硬式光箝制器的門檻值。此外,我們亦提出了隨機曼徹司特(Manchester)碼以增進同步式及非同步式光纖分碼多工擷取系統的誤碼率。雖然這種採用隨機曼徹司特碼的系統無法像採用適應性硬式光箝制器的系統那樣有效地改善系統效能,但它對系統複雜度也幾乎沒什麼影響。在分析誤碼率時,我們除了考慮多工擷取干擾外,並加入了熱雜訊、光二極體的散彈雜訊及暗電流雜訊。結果顯示,在相同系統複雜度及誤碼率的條件下,我們所提出的系統能讓較多的使用者同時擷取資訊。
我們亦提出一個新的三維碼,以將訊號編碼於時域、頻域、及空間軸上。這個三維碼的自相關次級值及交互相關極值分別是零和壹。在所提出的系統架構中,我們利用頻譜切割的技術以達到頻域編碼及解碼的目的。與其他的一維碼或二維碼相較,在相同誤碼率及使用者人數的要求下,三維碼能有時域長度較短的優點。如果系統參數設定得當,在誤碼率低於十億分之一的條件下,同時使用者人數甚至可以和容許註冊人數相當。
最後,我們提出一個結合分波多工擷取及分碼多工擷取技術的大容量光纖網路。我們利用可變長度的展頻碼來進一步增進網路的使用效率。同時我們也架構出一個全光式的編碼及解碼器。此外亦發展出一套全分散式的網路規約以增進傳輸效率並降低阻塞率。
In this thesis, several different fiber-optic code division
multiple access (CDMA) schemes are proposed. To improve the performance of synchronous systems, we propose a new receiver architecture using adaptive optical hardlimiter. By estimating the optical power in one bit duration, we obtain the side information to adjust the threshold value of the adaptive optical hardlimiter appropriately. Another system using random Manchester codes (RMC) to improve the bit error probability in both synchronous and asynchronous fiber-optic CDMA systems is also proposed. Though the RMC scheme can not improve the performance as effectively as the system using adaptive optical hardlimiter, the RMC scheme incurs little increment of system complexity. Thermal noise, shot noise, and dark current noise of the photodetector are taken into consideration in the bit error probability analyses. The results show that the proposed systems can support a larger number of simultaneous users than other systems with similar system complexity at the same bit-error probability.
A new family of three dimensional codes and the corresponding asynchronous fiber-optic CDMA network architecture are presented. The proposed temporal/spatial /wavelength (TSW) codes have out-of-phase autocorrelation and cross correlation equal to zero and one, respectively. The spectral slicing technology is utilized to achieve wavelength encoding and decoding. Compared with other one or two dimensional codes, the proposed codes can afford shorter temporal length under the same number of simultaneous users and bit error probability. If the system parameters are properly set, the number of simultaneous users can be the same as the number of available codes with bit error probability smaller than $10^{-9}$. Finally, we propose a new fiber-optic network architecture which combines wavelength division multiple access
(WDMA) and CDMA techniques to provide large system capacity.
The variable rate coding techniques to further increase the
network utilization is employed. The novel and simple design of
all-optical encoder and decoder is also presented. We also propose a fully distributed reservation protocol to improve the throughput and blocking probability significantly.
Cover
Table of Contents
List of Tables
List of Figures
Abstract
1 Introduction
1.1 Basic CDMA Concepts
1.2 Review of Fiber-Optic CDMA Technology
1.3 Organization of The Thesis
2 A Synchronous Fiber-Optic CDMA System Using Adaptive Optical Hardlimiter
2.1 Introduction
2.2 System Description
2.3 System Performance
2.4 Alternative Receiver Structure Using A TOA
2.4.1 Receiver Description
2.4.2 Bit-Error Rate Performance
2.5 Numerical Results and Discussions
2.6 Effect of Chip Misalignment
2.7 Summary
3 Channel Interference Reduction Using Random Manchester Codes for Both Synchronous and Asynchronous Fiber-Optic CDMA Systems
3.1 Introduction
3.2 System Description
3.3 System Performance
3.3.1 Synchronous fiber-Optic CDMA Systems
3.3.2 Asynchronous Fiber-Optic CDMA systems
3.4 Numerical Results and Discussions
3.5 Summary
4 Design and Analysis of Three Dimensional Codes for Fiber-Optic CDMA Networks
4.1 Introduction
4.2 Three Dimensional Codes And System Description
4.2.1 Design of Temporal/Spatial/Wavelength Codes
4.2.2 Description of System Architecture
4.3 System Performances Analysis
4.4 Numerical Results And Discussions
4.5 Summary
5 Fiber-Optic WDMA/CDMA Networks with Variable Rate Coding
5.1 Introduction
5.2 Network Architecture
5.3 Variable Rate Spreading Sequences
5.3.1 Theory
5.3.2 Implementation of All-Optical Encoder and Decoder
5.4 Communication Protocol
5.5 Performance Analysis
5.5.1 Theoretical Analysis
5.5.2 Numerical Results
5.6 Summary
6 Conclusion
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