Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/7019
標題: 使用二維展頻碼之光纖分碼多工系統之設計與效能分析
Design and Performance Analysis of CDMA Fiber-Optic Systems Using Two-Dimentional Spreading Codes
作者: 許家晟
Hsu, Chia-Cheng
關鍵字: 光纖方碼多工;O-CDMA;載波跳躍質數碼;過取樣;carrier-hopping prime codes;over-sampling
出版社: 電機工程學系所
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Hu, “Two-dimensional optical CDMA differential system with prime/OOC codes,” IEEE Photon. Technol. Lett., vol. 13, no. 12, pp. 1373-1375, Dec. 2001. [8] G.-C. Yang and W.C. Kwong, “Performance comparison of Multi-Wavelength CDMA and WDMA+CDMA for fiber-optic networks,” IEEE Trans. Commun., vol. 45, no. 11, pp.1426-1434, Nov. 1997. [9] G.-C. Yang and W.C. Kwong, “Performance analysis of extended carrier-hopping prime codes for optical CDMA,” IEEE Trans. Commun., vol. 53, no. 5, pp. 876-881, May 2005. [10] W.C. Kwong and G.-C. Yang, “Extended carrier-hopping prime codes for wavelength-time optical code-division multiple access,” IEEE Trans. Commun., vol. 52, no. 7, pp. 1084-1091, July 2004. [11] M.Y. Azizoglu, J.A. Salehi and Y. Li, “Optical CDMA via temporal codes,” IEEE Trans. Commun., vol. 40, no. 7, pp. 1162- 1170, Jul. 1992. [12] H. Kwon, “Optical orthogonal code-division multiple-access systems-part II: Multibits/sequence-period OOCDMA,” IEEE Trans. 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Mori, “Direct-detection optical synchronous CDMA systems with double optical hard-limiters using modified prime sequence codes,” IEEE Trans. Commun., vol 14, no. 9, pp. 1879-1887, Dec. 1996. [19] C.-Y. Chang., G.-C. Yang and W.C. Kwong, “Wavelength-time codes with maximum cross-correlation function of two for multicode-keying optical CDMA,” IEEE J. Lightwave Technol., vol. 24, no. 3, Mar. 2006. [20] L. Tancevski, and Andonovic, “Wavelength hopping/time spreading code division multiple access systems,” Electronics Letters, vol. 30, no. 17, pp. 1388-1390, Aug. 1994. [21] L.Tancevski, and Andonovic, “Hybrid wavelength hopping/time spreading schemes for use in massive optical networks with increased security,” IEEE J. Lightwave Technol., vol. 14, no. 12, pp. 2636-2647, Dec. 1996. [22] I.Vajda, and G.Einarsson, “Code Acquisition for a Frequency-Hopping System,” IEEE Trans. Commun., vol. 35, no. 5, pp. 566-568, May 1987. [23] S.V.Maric, “Construction of optimal frequency hopping sequences for minimising bit errors in selective fading channels characteristic to digital cellular systems,” IEEE Proc-Commun., vol. 142, no. 4, pp. 271-273, Aug. 1995. [24] P.Prucnal, M.Santoro, and Ting Fan, “Spread spectrum fiber-optic local area network using optical processing,” IEEE J. Lightwave Technol., vol. 4, no. 5, pp. 547-554, May 1986. [25] P.Prucnal, and M.Santoro, “Asynchronous fiber optic local area network using CDMA and optical correlation,” IEEE Proc., vol. 75, no. 9, pp. 1336-1338, Sept. 1987. [26] W.C.Kwong, and P.R.Prucnal, “`Synchronous'' CDMA demonstration for fibre-optic networks with optical processing,” Electronics Letters, vol. 26, no. 24, pp. 1990-1992, Nov. 1990. [27] J.A.Salehi, “Emerging optical code-division multiple access communication systems,” IEEE Network magazine, vol. 3, no. 2, pp. 31 -39, Mar. 1989. [28] A. Sawchuk and T. Strand, “Digital optical computing,” Proc. 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摘要: 
由於波長-時間編碼技術的發展,光纖分碼多工系統在近年來受到很多的矚目。這些編碼的規則就是利用二維編碼來增加碼數和同時間傳送的使用者數目。為了方便計算,大部分的光纖分碼多工系統的效能分析是使用同步的假設。然而,同步的假設只是對效能提供一個上邊界值,理想的非同步假設則會對效能提供下邊界值。之前的研究使用高思近似的方法對一維和二維的光纖分碼多工系統做非同步的效能分析,但是這方法只適用在較多的使用者人數。在本篇論文裡,我們利用較準確的組合和馬可夫鏈的方法在不同的光纖接收器下做非同步的分析,同時我們也對同步與非同步之間的效能做比較。我們也提出一個新的接收器,叫做過取樣接收器,它可以在任何時間下偵測光纖的強度。在非同步的假設之下,過取樣接收器將會對效能提供一個絕對下邊界值。

Fiber-optic code-division multiple-access (CDMA) recently attracts attention due to the advancement of wavelength-time coding techniques. The role of wavelength-time codes is to increase the numbers of subscribers and simultaneous users by utilizing two coding dimensions simultaneously. Most work on the performance analysis of optical CDMA (O-CDMA) systems used a chip-synchronous assumption for ease of computation. However, this assumption results in an upper bound (i.e., the worst case) on the performance, while an ideal chip-asynchronous assumption gives a lower bound. Therefore, there were recent studies on the performance analyses of one-dimensional (1-D) and two-dimensional (2-D) O-CDMA systems without the chip-synchronous assumption. A Gaussian approximation method was used, which tended to be accurate only for a large number of simultaneous users. In this thesis, we introduce combinatorial methods with the use of Markov chains for more accurate chip-asynchronous performance analyses in various O-CDMA receivers. The chip-asynchronous performance is then compared with that of the chip-synchronous case. We also study a new receiver, the so-called over-sampling receiver, which can detect optical intensity at any time instant, instead of over a chip interval. This receiver gives the absolute lower bound in performance under the chip-asynchronous assumption.
URI: http://hdl.handle.net/11455/7019
其他識別: U0005-2607200615591300
Appears in Collections:電機工程學系所

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