Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/8489
標題: 最大相關數值為二之光纖分碼多工系統最佳二維碼之設計
A New Construction of Optimal 2D Codes With Maximum Cross-Correlation Value of Two for Fiber-Optic CDMA Systems
作者: 林雨潔
Lin, Yu-Chieh
關鍵字: 二維光纖碼;two-dimensional optical codes;光纖正交碼;光纖分碼多工;二次同餘碼;近似最佳化;optical orthogonal code (OOC);optical code-division multiple access;quadratic congruence code;asymptotically optimal
出版社: 電機工程學系所
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摘要: 
近年來由於分碼多工系統中的二維編碼技術的發展,光纖網路技術開始受到新的關注。此二維編碼技術相較於一維編碼技術,可以提供更多的系統總用戶數而且能容納更多系統同步使用之用戶數。在本篇論文中,我們提出了一種新的二維光纖碼,此新二維光纖碼是利用最大相關數值為二的光纖正交碼作為時域展頻碼,並且以二次同餘碼作為波長跳躍碼。於本論文最後,我們將此新二維光纖碼與之前所提出的二維光纖碼做比較,從分析的結果顯示此新的二維光纖碼除能提供更多的系統同步使用用戶數外,且提供更大的碼重使系統具更佳之效能。

Two dimensional (2D) wavelength-time coding schemes have recently been studied for optical code-division multiple access (O-CDMA), supporting more numbers of subscribers and simultaneous users than their one-dimensional counterparts. In this thesis, a new family of 2D codes is proposed, which use “synchronized” quadratic congruence codes foe wavelength hopping and (n, w, 2, 2) optical orthogonal codes for time spreading. The new 2D codes provide larger (asymptotically optimal) code cardinality than other 2D codes by relaxing the maximum cross-correlation functions to two. Our study shows that the heavier code weight supported by our new 2D codes results in better performance than some of our previously proposed 2D codes which have the maximum cross-correlation value of one.
URI: http://hdl.handle.net/11455/8489
其他識別: U0005-1308200908484100
Appears in Collections:電機工程學系所

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