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標題: 應用二維展頻碼之多載波直接序列展頻分碼多工系統於無線衰退通道之效能分析
Performance Analysis of 2-Dimensional Spreading Codes for MC/DS-CDMA Wireless System over Fading Channels
作者: 李珮如
Lee, Pei-Ju
關鍵字: code division multiple access;分碼多工;MC/DS-CDMA;fading channel;多載波直接序列展頻;衰退通道
出版社: 電機工程學系所
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近來無線通訊系統因其第三代行動通訊(3G)顯著的資料、影像傳輸功能,較佳的手機通訊品質與較高傳輸率而引起各界矚目,並且隨著多載波直接序列展頻分碼多工技術的使用而更能提升其傳輸容量。在各種已被應用於多載波直接序列展頻分碼多工之編碼技術中,二維正交可變長度展頻碼(2-dimentional OVSF code)因其正交性質而有使用人數上的限制,在本論文中,我們改善之前提出的非正交的二維展頻碼(2-D frequency-hopping time-spreading code),在同樣效能下可以供給相同人數的使用者,而在犧牲部分系統效能下可供給的使用者人數獲得顯著提升,並且使用較準確的訊號雜訊比及錯誤率在不同的通道下分析。

In this thesis, a 2-D frequency-time-spreading (FTS) code is proposed for multicarrier direct-sequence code-division multiple-access (MC/DS-CDMA) systems. We derive more accurate signal-to-noise-ratio models and the bit error probabilities of the two-dimensional orthogonal variable spreading factor codes (OVSF), frequency-hopping time-spreading (FH-TS) code, and FTS code in a MC/DS-CDMA system over a non-fading AWGN, Rayleigh fading, and Rician fading channel. We focus on the exact formula of the bit error probabilities with the Rayleigh fading channel and especially for the Rician fading channels. Finally, our numerical examples show that the 2-D FTS code can support more number of subscribers than the 2-D OVSF codes with little trade-off in the code performance and always performs better than the FH-TS code.
其他識別: U0005-1807200701203100
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