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研究生:林宛錡
研究生(外文):Wan-Chi Lin
論文名稱:由多種頻帶分配方式改善混成碼分多址/波分多址系統之容量
論文名稱(外文):Capacity Improvement of a Hybrid CDMA/WDMA System by Various Bandwidth Allocation
指導教授:張伯浩
指導教授(外文):Po-Hao Chang
學位類別:碩士
校院名稱:國立東華大學
系所名稱:電機工程學系
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:2002
畢業學年度:90
語文別:中文
論文頁數:82
中文關鍵詞:混成系統波分多址碼分多址開關鍵移
外文關鍵詞:CDMAWDMAHybrid SystemOOK
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光纖通訊是未來電腦網路通訊的主流。光纖是目前光通訊應用最佳的光波導,它具有許多優點如:低損失、高頻寬、高保密性、重量輕及體積小等,這些都是傳統通訊電纜所缺少的優點。光通訊有各種不同的傳輸方式;由於光的頻率非常高,如果能夠控制並利用光來作為通訊的載波,那麼通訊量可以比傳統電波通訊大大地提高。
今日的光波分多址(WDMA)網路最多可以達到數百Gbps的總處理量,主要是因為非同調光技術及光/電(O/E)訊號之間的轉換限制了它的總處理量。對區域網路(LAN)來說,碼分多址(CDMA)是一個重要的技術;它不需要波分多址所需要之準確的波長控制、穩定、可調的雷射。
在本論文中,我們提出了一個混成碼分多址/波分多址(Hybrid CDMA/WDMA)的區域網路架構;碼分多址使用光相位編碼。我們回顧了碼分多址的系統描述,計算其在分配不同比例之可用頻寬下的使用者人數和對應的錯誤率和碼分多址/波分多址系統模型,並以錯誤率 以下為準,計算了混成系統中碼分多址及波分多址各自的使用者人數、總位元速率和碼分多址接收器的threshold。
而且對碼分多址而言,增加碼長度( ),系統的性能會大大地改善,因此能容納更多的使用者。在本論文中我們計算了三種碼長度,分別是128、256和512,由計算的表格中,可以發現,當分配給碼分多址的使用者愈少的可用頻寬時,碼分多址的使用者人數會下降,連帶也可能使混成系統的總使用人數減少,但是總位元速率卻會隨著分配給碼分多址的可用頻寬的減少而增加,計算之波分多址的波道間隔有100GHz和50GHz兩種。
我們也列舉了其它可能的頻寬分配方式,並計算其總使用人數和總位元速率,發現同樣的碼分多址可用頻寬的分配比例,後來所舉出的其他分配方式,可容納稍多的使用者數目,儘管增加的數目並不多,也可稍微增加總位元速率。已有學者提出波分多址的位元速率將可以達到10Gbps,我們也依此數據重新把所提系統的總位元速率計算了一遍。
Optical fiber communication is the most popular type of computer network communication. Fiber is the best waveguide of light applications. It has lots of advantages such as low loss, high bandwidth, high security, etc. Coventional communication cable is short of these advantages. Optical communication has various ways for transmission. Because of the high frequency of light, if we could control and use light for carrier of communication, capacity would be larger than conventional communication.
Today’s optical Wavelength-Division Multiple-Access (WDMA) networks achieve total throughputs of at most ten Gbps, primarily because the use of inchherent optical techniques limits their total throughput to the speeds that be handled by electronics technology. One significant possibility for Local Area Networks (LANs) is Code-Division Multiple-Access (CDMA) which does not need the stable, tunable lasers with accurate wavelength control that WDMA needs.
In this thesis, we propose a hybrid CDMA/WDMA architecture of LAN. The CDMA scheme is based upon spectral coding. The system description of CDMA is reviewed, and the CDMA/WDMA system model is developed. The bit error rate (BER), numbers of CDMA and WDMA users, and receiver threshold of CDMA are calculated at BER of .
For CDMA, system performance will be improved greatly by increasing code length (No) so that it can accommodate more users. We calculate three types of code length, namely 128, 256, and 512. When the proportion of usable bandwidth that is allocated to CDMA users is decreased, the total number of users of hybrid system will decrease but the total bit rate will increase. We calculate two types of channel interval of WDMA, namely 100GHz and 50GHz.
We also list other types of feasible allocation, and calculate total number of users and bit rate. More users can be allowed in these types of allocation and total bit rate will be increased slightly. The bit rate of CDMA (60Mbps) is less than WDMA (1.2Gbps). Bit rate of WDMA that can reach 10Gbps has been proposed. We use this data to calculate total bit rate of the system again. Although total number of users is less than that in the pure CDMA system, total bit rate will increase.
第一章 簡介
1-1 研究簡介
1-2 論文大綱
第二章 光纖傳輸技術
2-1 光纖的色散特性
2-2 單模態光纖的類型
2-3 光纖的非線性
2-4 被動元件
2-5 光源與光檢測器
2-5-1 Ultrashort pulse laser
2-5-2 光檢測器(photo detector)
2-6 光纖通信系統
2-6-1 分波多工光纖傳輸系統
2-6-2 摻鉺光纖放大器(EDFA)
第三章 混成碼分多址/波分多址系統
3-1 碼分多址(CDMA)系統介紹
3-2 碼分多址系統之性能分析
3-3 混成碼分多址/波分多址系統介紹
第四章 混成碼分多址/波分多址系統之模擬數據結果
4-1 錯誤率對normalized threshold的模擬數據圖
4-2 使用者數目對最小錯誤率的模擬數據圖
4-3 混成系統總容量之列表
4-4 其它不同的可用頻寬分配方式
第五章 結論
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[2]Po-Hao Chang, and Edward J. Coyle, “Performance Analysis of a Hybrid Code-Division Multiple-Access/Wavelength-Division Multiple-Access System Based on Spectral Encoding”, submitted to IEEE J. Lightwave Technology
[3]H. P. Sardesai, C.-C. Chang and A. M. Weiner, “A Femtosecond Code-Division Multiple-Access Communication System Test Bed”, IEEE Journal of Lightwave Technology, vol. 16, no. 11, November 1998.
[4]Andrew M. Weiner, Daniel E. Leaird, J. S. Patel, and John R. Wullert, “Programmable Shaping of Femtosecond Optical Pulses by Use of 128-Element Liquid Crystal Phase Modulator”, IEEE Journal of Quantum Electronics, vol. 28, no. 4, April 1992.
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[9]J. A. Salehi and C. A. Brackett, “Code Division Multiple-Access Techniques in Optical Fiber Networks—part Ⅱ: Systems Performance Analysis”, IEEE Trans. Commun., vol. 37, no. 7, August 1989.
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[11]Pedro M. Crespo, Michael L. Honig, and Jawad A. Salehi, “Spread-Time Code-Division Multiple Access”, IEEE Transactions on Commun., vol. 43, no. 6, June 1995
[12]Stamatios V. Kartalopoulos, “Introduction to DWDM Technology”, 2000.
[13]Gerd Keiser, “Optical Fiber Communications”, third edition 2000
[14]Jean-Claude Diels, Wolfgang Rudolph., “Ultrashort laser pulse phenomena: fundamentals, techniques, and applications on a femtosecond time scale”, 1996.
[15]Rajiv Ramaswami, Kumar N. Sivarajan, “Optical Networks: A Practical Perspective”, 1998
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[21]鄭振東,”光纖與通訊網路”,全華出版,1999
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