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Design and Performance Analysis of CDMA Fiber-Optic Systems Using Two-Dimentional Spreading Codes
|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||引用:|| J. A. Salehi, “Code division multiple-access techniques in optical fiber network-Part I: Fundamental principles,” IEEE Trans. Commun., vol. 37, no. 8, pp. 824-833, Aug. 1989.  J. A. Salehi and C. A. Brackett, “Code division multiple-access techniques in optical fiber network-Part II: System performance analysis,” IEEE Trans. Commun., vol. 37, no. 8, pp. 834-842, Aug. 1989.  A. Stok and E. H. Sargent, “The role of optical CDMA in access networks,” IEEE Commun. Mag., vol. 40, no. 9, pp. 83-87, Sep. 2002.  J. Ratnam, “Optical CDMA in broadband communication-scope and applications,” J. Opt. Commun., vol. 23, no. 1, pp. 11-21, Jan. 2002.  G.-C. Yang and W.C. Kwong, Prime Codes with Applications to CDMA Optical and Wireless Networks, Artech House, Norwood, MA, 2002.  R.M.H. Yim, L.R. Chen and J. Bajcsy, “Design and performance of 2-D codes for wavelength-time optical CDMA,” IEEE Photon. Technol. 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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.
|Appears in Collections:||電機工程學系所|
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