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論文名稱 Title |
前瞻性無線分碼多工編碼之研究
CDMA signature code design for future wireless applications |
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系所名稱 Department |
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畢業學年期 Year, semester |
語文別 Language |
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學位類別 Degree |
頁數 Number of pages |
61 |
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研究生 Author |
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指導教授 Advisor |
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召集委員 Convenor |
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口試委員 Advisory Committee |
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口試日期 Date of Exam |
2003-07-29 |
繳交日期 Date of Submission |
2003-08-04 |
關鍵字 Keywords |
展頻碼、分碼多工 spreading code, CDMA |
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統計 Statistics |
本論文已被瀏覽 5671 次,被下載 4292 次 The thesis/dissertation has been browsed 5671 times, has been downloaded 4292 times. |
中文摘要 |
在本論文中主要探討具有完美特性展頻碼的產生,也就是發展出一組不管再任何位移底下都可達到完全零相關,沒有任何多路徑干擾與多用戶擷取干擾之展頻碼。 本論文中一開始分析一般常用之展頻碼,分析其性能與特性,進而討論如何產生一組完美展頻碼。本論文一開始把所有的碼資訊都當成未知數,依自相關函數與互相關函數所形成之方程式組,去解其值。接著作相關性的探討,討論其可支援最大用戶數與碼之間的關係,本論文探討出欲實現出此完美之展頻碼,必須使用互補碼實現,而且可支援互用數與其子碼個數一樣。這也顯示出完美展頻碼之極限,欲增加使用者必須增加子碼個數,而子碼長度則跟系統抗特殊干擾能力有關,完美展頻碼仍然不可抗白雜訊 (AWGN),但是根據展頻系統的效能指出可以抗特殊干擾因此子碼長越長抗干擾能力越強,但是傳輸速率會降低。 根據實現的可能性採用多載波系統或是OFDM來傳送。基於其完美之自相關函數與互相關函數,在傳輸時,並無多路徑干擾與多用戶擷取干擾,所以只需探討其受雜訊干擾所會產生之錯誤率。 |
Abstract |
Abstract For reducing the interference of multi-path and multi-user access, we propose to design a spreading code with ideal auto-correlation and cross-correlation. In this paper, we will introduce a code with ideal auto-correlation and cross-correlation. Recently, there has been great interest in applying zero correlation spreading codes to reduce interference of different users or their multi-path. The set of sequences having zero auto-correlation and cross-correlation plays an important part in typical DS-CDMA systems. A periodic sequence with zero out-of-phase auto-correlation is called a perfect or an orthogonal sequence, it can mitigate the multi-path interference. Similarly, a set of periodic sequences with zero cross-correlation values is called a set of uncorrelated sequences. However, it is impossible to be found in single sequence spreading code. In this paper, we propose a new code for ideal auto-correlation and cross-correlation, and the code set size is equal to the number of flock size. |
目次 Table of Contents |
中文摘要 英文摘要 誌謝 目錄 圖表目錄 第一章 前言 第二章 導論 第三章 展頻碼之分析與比較 3-1最大長度序列( M-Sequence ) 3-2 Walsh Code 3-3 Gold Code 3-4 OVSF Code 3-5 LS Code 3-6 ILS Code 3-7 模擬結果 第四章 由求解相關函數方程組求解完美展頻碼 4-1求解非線性方程式組 4-2將非線性方程式組轉為線性方程式組求解 4-3系統模型分析 第五章 二維展頻碼 5-1二維展頻碼 5-2頻率上正交編碼 5-3 結論 第六章 結論 參考文獻 |
參考文獻 References |
References [1]. A new unified construction of perfect root-of-unity sequences Wai Ho Mow; Spread Spectrum Techniques and Applications Proceedings, 1996., IEEE 4th International Symposium on , Volume: 3 , 22-25 Sep 1996 Page(s): 955 -959 vol.3 [2]. China Wireless Telecommunication Standards CWTS WG1 LAS-CDMA Sub-Working Group [3]. Are LAS-codes a miracle ? Stanczak, S.; Boche, H.; Haardt, M.; Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE , Volume: 1 , 25-29 Nov. 2001 Page(s): 589 -593 vol.1 [4]. Spreading codes for direct sequence CDMA and wideband CDMA cellular networks Dinan, E.H.; Jabbari, B.; Communications Magazine, IEEE , Volume: 36 Issue: 9 , Sept. 1998 Page(s): 48 -54 [5]. A multicarrier CDMA architecture based on orthogonal complementary codes for new generations of wideband wireless communications Hsiao-Hwa Chen; Jun-Feng Yeh; Suehiro, N.; Communications Magazine, IEEE , Volume: 39 Issue: 10 , Oct. 2001 Page(s): 126 -135 [6]. 2D orthogonal spreading codes for multicarrier DS-CDMA systems Chia-Ming Yang; Pei-Hsuan Lin; Guu-Chang Yang; Kwong, W.C.; Communications, 2003. ICC '03. IEEE International Conference on , Volume: 5 , 2003 Page(s): 3277 -3281 [7]. Isotropic Air-Interface Technologies for Fourth Generation Wireless Communications HH Chen, Jin-Xiao Lin, Shin-Wei Chu, Chi-Feng Wu & Guo-Sheng Chen to appear in Wireless Communications & Mobile Computing (WCMC) Journal, Wiley InterScience, John Wiley & Sons Ltd., September 2003. [8]. A Spectral Efficient CDMA Architecture Based On Complementary Codes For B3G Wireless Communications HH Chen, Jin-Xian Lin & Shin-Wei Chu Proceedings of IEEE International Workshop on Intelligent Signal Processing and Communication Systems 2002 (ISPACS 2002), Ambassador Hotel, Kaohsiung, Taiwan, pp. 57-64. November 21-24, 2002 (ISBN: 957-9014-31-0). [9]. Crosscorrelation Properties of Pseudo-random and Related Sequences, D.V. Sarwate and M.B. Pursley Proc. IEEE, Vol. 68, pp. 593-619, May 1980. |
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