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Performance Analysis of Synchronous and Asynchronous Wavelength-Time Spreading Codes for Optical CDMA Systems
|關鍵字:||OCDMA;光纖分碼多工系統;Wavelength-time spreading codes;波長時間展頻碼||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 1:fundamental principles,” IEEE Trans. Commun., vol.37, pp.824-833, Aug.1989. T. O'Farrell and S. Lochmann, “Performance analysis of an optical correlator receiver for SIK DS-CDMA communication,” Electron. Lett., vol. 30, no.1, pp. 63-65, Jan. 1994. M. Kavehard and D. Zaccarin, “Optical code-division-multiplexed systems based on spectral encoding of noncoherent sources.” J. Lightwave Technol., vol. 13, no. 1, pp. 534-545, Mar. 1995. G.-C. Yang and W.C. Kwong, Prime codes with applications to CDMA optical and wireless networks, Artech House, Boston, MA, 2002. F.R.K. Chung, J.A. Salehi, and V.K. Wei, “Optical Orthogonal Codes: Design, Analysis, and Applications,” IEEE Trans. Info. Theory, vol. 35, no. 3, pp. 595-604, 1989. G.-C. Yang, and T. 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Xian, Theory and Appliciation of Higher-Dimensional Hadamard Matrices, Kluwer Academic, New York: 2001.||摘要:||
In this thesis, we propose a “synchronous” wavelength-time optical code-division multiple access (OCDMA) scheme using two-dimensional (2-D) Walsh-based bipolar-bipolar code, in which Walsh code sequences are used for time spreading, in place of Barker sequences used in our previously proposed “asynchronous” bipolar- bipolar code. The new synchronous coding scheme supports larger cardinality and better performance than the asynchronous scheme because Walsh code has larger cardinality than Barker sequences and a zero cross-correlation property, in the expense of requiring system synchronization. One potential application is future CDMA-based passive optical networks (PONs), in which synchronous downstream traffic uses the Walsh- based bipolar-bipolar code and asynchronous upstream traffic uses the Barker-based counterpart. Since the new code is modified from the original code, the same hardware can be used for both directions of traffic. Besides, we also compare the bipolar-bipolar code with the bipolar-unipolar code with and without hard-limiting.
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