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研究生:莊勝凱
研究生(外文):Sheng-Kai Juang
論文名稱:直接序列展頻系統之可變長度展頻與多重碼技術之研究
論文名稱(外文):DS-CDMA Wireless Systems with Variable-Length Spreading and Multi-Code Techniques
指導教授:楊谷章
指導教授(外文):Guu-Chang Yang
學位類別:碩士
校院名稱:國立中興大學
系所名稱:電機工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2001
畢業學年度:89
語文別:英文
論文頁數:65
中文關鍵詞:直接序列展頻可變長度展頻多重碼
外文關鍵詞:DS-CDMAvariable-length spreadingmulti-code
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近年來由於消費者對於無線傳輸服務之需求快速的增加,使得無線產品製造商不得不提供更新更好的產品來滿足消費大眾,因此第三代行動通訊IMT-2000 (International Mobile Telecommunication 2000) 應運而生,在眾多的提案中,WCDMA被認為是最有希望成為第三代行動通訊之標準的提案之一,在WCDMA 的系統架構中,為了提供多速率傳輸 (multiple-rate transmission) 的服務,可變長度展頻 (variable-length spreading) 以及多重碼 (multi-code) 為應用於WCDMA系統中的兩種主要技術,在本篇論文中我們會分析這兩種技術的效能表現並且加以比較,此外為了用更有效率的方法實現可變長度展頻碼 (OVSF code),一種將可變長度展頻碼以褐色碼(Gray code) 加以標籤的新方法也於此篇論文中提出。

The demand for all types of wireless services are continuous increasing in recent years. The third generation (3G) mobile system "International Mobile Telecommunication 2000 (IMT-2000)" is under development to meet these requirements. Among the proposals of IMT-2000, WCDMA is the most promising candidate. WCDMA chooses direct-sequence code-division multiple-access
(DS-CDMA) technique to provide the 3G services. In order to allow multiple-rate transmission, "variable-length spreading" and "multi-code" techniques are two major approaches used in WCDMA systems. In this thesis, we focus on the performance analysis of these two techniques. Moreover, to implement OVSF codes efficiently, a new approach to generate the OVSF codes
with Gray code labeling is proposed.

Chapter1 Introduction
Chapter2 Multi-Rate CDMA Systems
2.1 DS-CDMA System
2.2 Channel Models
2.2.1 AWGN Channel
2.2.2 Rayleigh Fading Channel
2.2.3 RAKE Receiver
2.3 Variable-Length Spreading CDMA System
2.3.1 System Model
2.3.2 Performance Analysis
2.3.3 Numerical Results
2.3.4 Summary
2.4 Multi-Code CDMA System
2.4.1 System Model
2.4.2 Performance Analysis
2.4.3 Numerical Results
2.4.4 Summary
2.5 Comparison between Variable-Length Spreading and Multi-Code
CDMA Systems
2.6 Summary
Chapter3 Gray Code Labeling
3.1 Introduction
3.2 Gray code
3.3 Generation of OVSF code with Gray code Labeling}
3.4 OVSF Code Reassignment
3.5 Summary
Chapter4 Conclusions

ETSI. ''{The ETSI UMTS Terrestrial Radio Access (UTRA) ITU-R RTT Candidate Submission}'', June 1998.
Arib.''{Japan's Proposal for Candidate Radio Transmission Technology on IMT-2000: W-CDMA}'', June 1998.
TIA.''{The cdma2000 ITU-R RTT Candidate Submission}'',
June 1998.
CATT.''{TD-SCDMA Radio Transmission Technology for IMT-2000}''.
Sep 1998.
Alex~W. Lam and Sawasd Tantaratana.
Theory and Application of Spread-Spectrum Systems:
A self-study Course.
Institute of Electrical and Electronics Engineers, Inc., 1994.
Ramjee Prasad and Tero Ojanpera.
''{An Overview of CDMA Evolution Toward Wideband CDMA}''.
\newblock {\em IEEE Communications Surveys, vol.1, no. 1, pp. 31-34}, Fourth Quarter 1998.
Robert~C. Dixon.
Spread Spectrum Systems with Commercial Applications.
John Wiley & Sons, third edition, 1994.

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