| 研究生: |
李界鋒 Jei-Feng Li |
|---|---|
| 論文名稱: |
在寬頻分碼多重擷取技術上分配及再分配多重正交可變展頻係數碼 Multi-OVSF Code Assignment and Reassignment in WCDMA |
| 指導教授: |
許健平
Jang-Ping Sheu |
| 口試委員: | |
| 學位類別: |
碩士 Master |
| 系所名稱: |
資訊電機學院 - 資訊工程學系 Department of Computer Science & Information Engineering |
| 畢業學年度: | 89 |
| 語文別: | 中文 |
| 論文頁數: | 89 |
| 中文關鍵詞: | 正交可變展頻係數碼 、寬頻分碼多重擷取技術 、分配及再分配 |
| 相關次數: | 點閱:4 下載:0 |
| 分享至: |
| 查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
在3GPP技術標準上, 在OVSF編碼被用來區分不同的連線. 使用OVSF編碼可以提供可變的傳輸速率以彈性的因應不同頻寬需求的應用. OVSF編碼的分配跟在分配可以在系統的效能上扮演一個重要的角色. 假設只有一個碼可以分配給使用者可能會造成內部的浪費問題然而分配多重碼給使用者會增加系統的複雜度. 這篇文章最主要的目的是想提供更多使用者跟降低系統負載下找出好的碼的分配跟再分配的方法. 我們提出了四個分配跟再分配的方法: random, leftmost, crowded-first, and mostuser-first. 而模擬程式所呈現的結果crowded-first 跟 mostuser-first 比其他方法有更好的效果.
[1] Third generation partnership project; Technical specification group radio access net-work.
Spreading and modulation (FDD), http://www.3gpp.org, 1999.
[2] A. S. Tanenbaum. Modern Operating Systems. Prentice Hall, 1992.
[3] F. Adachi, MSawahashi, and K. Okawa. Tree-structured generation of orthogonal
spreading codes with different lengths for forward link of DS-CDMA mobile radio.
Electron. Lett., 33:27—28, Jan., 1997.
[4] F. Adachi, M. Sawahashi, and H. Suda. Wideband ds-cdma for next-generation mo-bile
communications systems. IEEE COMMUNICATIONS MAGAZINE, 36:56—69,
Sept. 1998.
[5] R.-G. Cheng. A code managemant mechanism for WCDMA mobile communication
networks, June, 1999. Internation Workshop on Mobile Communications.
[6] R.-G. Cheng and P. Lin. OVSF Code Channel Assignment for IMT-2000. Vehicular
Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st,
3:2188—2192, May, 2000.
[7] E. Dahlman, B. Gudmundson, M. Nilsson, and J. Skold. Umts/imt-2000 based on
wideband cdma. IEEE COMMUNICATIONS MAGAZINE, 36:70—80, Sept. 1998.
[8] I. C.-L. et al. IS-95 enhancements for multimedia services. EBell Labs. Tech. J., pages
60—87, Autumn, 1996.
[9] R. Fantacci and S. Nannicini. Multiple Access Protocol for Integration of Variable
Bit Rate Multimedia Traffic in UMTS/IMT-2000 Based on Wideband CDMA. IEEE
Journal on Selected Areas in Communications, 18(8):1441—1454, Aug., 2000.
[10] Harri Holma and Antti Toskala. WCDMA for UMTS. John Wiley & Sons, 2000.
[11] J. G. Proakis. Digital Communications. McGraw-Hill, 1995.
[12] T. Minn and I. Kai-Yeung Siu, Member. Dynamic assignment of orthogonal variable-spreading-
factor codes in w-cdma. IEEE Journal on Selected Area in Communica-tions,
18(8):1429—1440, Aug. 2000.
[13] V. K. Garg. IS-95 CDMA and cdma2000. Prentice Hall, 2000.