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標題: 使用二維展頻碼之光纖分碼多工系統之設計與效能分析
Design and Performance Analysis of CDMA Fiber-Optic Systems Using Two-Dimentional Spreading Codes
作者: 許家晟
Hsu, Chia-Cheng
關鍵字: 光纖方碼多工;O-CDMA;載波跳躍質數碼;過取樣;carrier-hopping prime codes;over-sampling
出版社: 電機工程學系所
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Fiber-optic code-division multiple-access (CDMA) recently attracts attention due to the advancement of wavelength-time coding techniques. The role of wavelength-time codes is to increase the numbers of subscribers and simultaneous users by utilizing two coding dimensions simultaneously. Most work on the performance analysis of optical CDMA (O-CDMA) systems used a chip-synchronous assumption for ease of computation. However, this assumption results in an upper bound (i.e., the worst case) on the performance, while an ideal chip-asynchronous assumption gives a lower bound. Therefore, there were recent studies on the performance analyses of one-dimensional (1-D) and two-dimensional (2-D) O-CDMA systems without the chip-synchronous assumption. A Gaussian approximation method was used, which tended to be accurate only for a large number of simultaneous users. In this thesis, we introduce combinatorial methods with the use of Markov chains for more accurate chip-asynchronous performance analyses in various O-CDMA receivers. The chip-asynchronous performance is then compared with that of the chip-synchronous case. We also study a new receiver, the so-called over-sampling receiver, which can detect optical intensity at any time instant, instead of over a chip interval. This receiver gives the absolute lower bound in performance under the chip-asynchronous assumption.
其他識別: U0005-2607200615591300
Appears in Collections:電機工程學系所

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