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Extended Reed-Solomon Codes for Optical CDMA Systems
|關鍵字:||光纖分碼多工;optical code division multiple access;里德所羅門碼;循環碼;樹狀結構;Reed-Solomon codes;cyclic codes;tree structure||出版社:||通訊工程研究所||引用:|| L. Tancevski and I. Andonovic, “Hybrid wavelength hopping/time spreading schemes for use in massive optical networks with increased security,” J. Lightw. Technol., vol. 14, no. 12, pp. 2636-2647, Dec. 1996.  G.-C. Yang and W. C. Kwong, “Performance comparison of multiwavelength CDMA and WDMA+CDMA for fiber-optic networks,” IEEE Trans. Commun., vol. 45, no. 11, pp. 1426-1434, Nov. 1997.  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. Lett., vol. 14, no. 5, pp. 714-716, May 2002.  W. C. Kwong, G.-C. Yang, V. Baby, C.-S. Brès, and P. R. 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In this thesis, the extended Reed-Solomon codes are modified to construct a new family of 2-D optical codes for asynchronous optical code-division multiple access (O-CDMA). Besides having expanded and asymptotically optimal cardinality, these asynchronous codes can be partitioned into multiple tree structures of code subsets, in which cardinality is a function of the cross-correlation value assigned to the subset. The hard-limiting performance of these 2-D optical codes is analyzed and compared with the multilevel prime codes under the same code parameters. Our results show that the unique partition property of these codes supports a trade-off between code cardinality and performance for meeting different system requirements, such as user capacity and throughput. In addition, the multiple-tree structure of the new codes potentially supports applications that requires rapid switching of many optical codes, such as in O-CDMA-network gateway or in environments where code obscurity is essential.
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