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|標題:||Design and Analysis of Generalized Diversity Optical CDMA Systems
|關鍵字:||拷貝非同步;copy asynchronous;位元非同步;相關性;多樣性;開關鍵移;光纖分碼多工系統;chip asynchronous;dependent;diversity;on-off keying;optical code-division multiple access||出版社:||通訊工程研究所||引用:|| P.R. Prucnal, M. Santoro, and T. Fan, “Spread spectrum fiber-optic local area network using optical processing,” IEEE J. Lightw. Technol., vol. 4, no. 5, pp. 547–554, May 1986.  J.A. Salehi, “Code division multiple-access techniques in optical fiber networks. I. Fundamental principles,” IEEE Trans. Commun., vol. 37, no. 8, pp. 824–833, Aug. 1989.  W.C. Kwong, P.A. Perrier, and P.R. Prucnal, “Performance comparison of asynchronous and synchronous code-division multiple-access techniques for fiber-optic local area networks,” IEEE Trans. Commun., vol. 39, no. 11, pp. 1625–1634, Nov. 1991.  A. Stok and E.H. Sargent, “The role of optical CDMA in access networks,” IEEE Mag. Commun., vol. 40, no. 9, pp. 83–87, Sep. 2002.  P.R. 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In our recently proposed diversity O-CDMA scheme, every simultaneous user transmitted multiple copies of an optical code per data bit of one in order to achieve good code performance. To maintain performance, our analysis showed that copy independency wasessential, which was achieved by time-shifting these copies to different chip (or time-slot) positions per bit duration. However, complete copy independency is hard to achieve under the conventional chip-synchronous assumption, especially in short code length. In this paper, we combine the realistic effects of chip asynchronism and copy dependency in the analysis of such diversity O-CDMA systems and formulate a new, generalized, and more accurate performance model. Finally, the improvement in copy independency and code performance due to the introduction of finer granularity in time-shfits among the diversity copies are studied.
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