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標題: 光纖分碼多工系統之延伸多階層質數碼
Extended Multi-Level Prime Codes for Optical CDMA Systems
作者: 孫卓成
Sun, Cho-Cheng
關鍵字: multilevel code;多階層碼;optical CDMA;tree structure;光纖分碼多工;樹結構
出版社: 電機工程學系所
引用: [1] 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. [2] 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," J. Lightw. Technol., vol. 24, no. 3, pp. 1093-1100, Mar. 2006. [3] L. Tan?evski and I. Andonovic, "Hybird 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. [4] 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. 1426-1436, Nov. 1997. [5] G.-C. Yang and W.C. Kwong, Prime Codes With Applications to CDMA optical and Wireless Networks, Artech House, Norwood, MA, 2002. [6] 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. [7] W.C. Kwong, G.-C. Yang, V. Baby, C.-S Bres, and P.R. Prucnal, "Multiple-wavelength optical orthogonal codes under prime-sequence permutations for optical CDMA," IEEE Trans. Commun., vol. 53, no.1, pp. 117-123, Jan. 2005. [8] C.-H. Hsieh, G.-C. Yang, C.-Y. Chang, and W.C. Kwong, "Constructions on 2D wavelength-time codes for CDMA fiber-optic systems," to appear in Proc., IEEE Inter. Conf. Commun., Jun. 2009. [9] G.-C. Yang and J.-Y. Jaw, "Performance analysis and sequence designs of synchronous code-division multiple-access systems with multimedia services," IEE Proceedings-Commun., vol. 141, no. 6, pp. 371, Dec. 1994. [10] J.-J. Chen and G.-C. Yang, "CDMA fiber-optic systems with optical hard limiters," J. Lightw. Technol., vol. 19, no. 7, pp. 950-958, Jul. 2001.

In this thesis, a new family of “multi-level” wavelength-time codes with expanded code cardinality, flexible code length, zero autocorrelation sidelobes, and the maximum cross-correlation function of any arbitrary positive integer n is constructed and analyzed. Besides having asymptotically optimal cardinality, the new codes can be partitioned into n levels, such that the cross-correlation function between any two code matrices in level l is at most l, where 1 l n. The performance of these multi-level codes in an optical code-division multiple-access system with hard-limiting detection is analyzed algebraically. Our results show that the unique partition property of these multi-level codes supports a trade-off between code cardinality and performance for meeting different system requirements, such as user capacity and throughput.
其他識別: U0005-1208200918242600
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