跳到主要內容

臺灣博碩士論文加值系統

(3.87.250.158) 您好!臺灣時間:2022/01/25 18:26
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果 :::

詳目顯示

我願授權國圖
: 
twitterline
研究生:何文賢
研究生(外文):Wen-Hsien Ho
論文名稱:在CDMA/TDD系統中對於減少干擾的時槽分配演算法之研究
論文名稱(外文):A Study of Time Slot Allocation Algorithm to Avoid the Interference in the CDMA/TDD System
指導教授:蘇賜麟
指導教授(外文):Szu-Lin Su
學位類別:碩士
校院名稱:國立成功大學
系所名稱:電機工程學系碩博士班
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:2002
畢業學年度:90
語文別:中文
論文頁數:52
中文關鍵詞:分時多工技術分碼多工擷取技術
外文關鍵詞:CDMATDD
相關次數:
  • 被引用被引用:0
  • 點閱點閱:117
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0

在 CDMA/TDD 系統中
對於減少干擾的時槽分配演算法之研究
何文賢* 蘇賜麟**
國立成功大學電機工程系碩士班通訊組
摘要
TDD系統的packet scheduling設計除了上層協定中依訊息priority考量而有不同規劃外,最主要的影響因素為TDD系統的上下傳(up/down link)通道可採用非對稱式時槽(time slot)分配,以滿足上下傳packet傳送的不同頻寬需求,這也是TDD系統與FDD系統在空中介面無線資源上最大的不同。然而此時槽分配的自由度,也讓TDD系統可能遭受FDD系統中所不會產生的多用戶干擾類型(BS-BS interference及MS-MS interference)。若此TDD系統與受干擾限制的多重擷取技術如CDMA結合,則此額外的干擾訊號將是一個重要的討論議題。
在本篇論文中,將針對CDMA/TDD系統的特性並依據細胞間不同的服務要求,分析各種情況下之Outage Probability,並利用時槽的分配,提出一個合適的機動頻道配置方法(dynamic channel assignment algorithm),以降低細胞自身及相鄰細胞間的多用戶干擾,並提高無線通訊資源使用效率。另外我們以軟體模擬來印證數學分析結果。
* 作者
** 指導教授


A Study of Time Slot Allocation Algorithm to
Avoid the Interference in the CDMA/TDD System
Wen-Hsien Ho* Szu-Lin Su**
Department of Electrical Engineering
National Cheng Kung University, Tainan,
Taiwan,R.O.C
Besides considering the priority of the messages, the most important factor that will affect the packet scheduling design of a time-division duplex (TDD) communication system is the inherent capability of unbalanced slot allocation between uplink and downlink channels. This unbalanced allocation function is the major difference on the radio resource management of the air interface between TDD and FDD (frequency-division duplex) systems. Hence, the TDD system will suffer from extra multiusers’ interference (e.g, interference of BS-BS and MS-MS) when compared to the FDD system because of the freedom of time-slot allocation. Such extra multiusers’ interference will become more important, if the TDD scheme is combined with CDMA technique, which has an interference-limited capacity.
In this thesis, according to the different traffic patterns between adjacent cells, we analyze the outage probability caused by MS-MS interference and other interference such as BS-BS, MS-BS, BS-MS interference. We propose a proper dynamic channel assignment algorithm by time slot allocation to reduce the multiusers’ interference from adjacent cells. The DCA increase the utilization of the radio resource, and then the analytic results are verified by simulation.

* The Author
** The Advisor


Contents
Abstract ……………………………………………………………………………i
Contents ……………………………………………………………………………ii
List of Tables ………………………………………………………………iv
List of Figures …………………………………………………………… v
1 INTRODUCTION ……………………………………………………1
1.1 Introduction ……………………………………………………………1
1.2 Outline ……………………………………………………………………………4
2 UTRA TDD CHARACTERISTICS DESTRIPTION ………………………5
2.1 Differences Between TDD Mode and FDDMode………………………………5
2.2UTRATDDPhysicalLayer………………………………………………………6
2.3 Inference Between Uplink and Downlink in the TDD System……………7
2.4 Time Slot Allocation Strategy…………………………………8
2.5 Dynamic Channel Assignment………………9
3 OUTAGE PROBABILITY ANALYSIS………13
3.1 AnalysisModel ……13
3.2 Outage Probability Analysis …………15
3.2.1 Analysis without fading channel ………………………15
3.2.1.1 During the Crossed Time Slot Pair ……………………………15
3.2.2 Analysis with Shadow Fading Channel ……22
3.2.2.1 During the Crossed Time Slot Pair ………22
3.2.2.2 During the Uplink Time Slot Pair ………26
3.2.2.3 During the Downlink Time Slot Pair ……………………………29
3.3 Numerical Results and Discussions ……31
3.3.1 Numerical Results ………31
3.3.2 Discussions … 32
4 PROPOSED ALGORITHM & SIMULATION MODEL …38
4.1 Proposed Dynamic Channel Assignment ……………38
4.2 Simulation Platform ……40
4.3 Simulation Results and Discussions …………………………………43
4.3.1 Performance of the Proposed Algorithm ……………………………43
4.3.2 Performance of the Random Allocation Algorithm 44
4.3.3 Compare the Performance of the Proposed Algorithm with the Random Allocation Algorithm …………44
5 CONCLUSION ……………………………………………49
REFERENCE ……………………………………………50
List of Tables
I. Comparison of UTRA TDD and FDD Physical basic parameters …………12
II. The performance of the random allocation algorithm …48
III. The optimal performance of the class B downlink channel with the proposed algorithm ……48
List of Figures
1. UMTS spectrum allocation ……………………………2
2. Example of TDD frame structure …………………………………7
3. Mobile-to-mobile interference at the cell border …10
4. Base station-to-base station interference between adjacent cells …………………11
5. Region division of CDMA/TDD cells …12
6. The location of mobile i and mobile j in cell A and cell B ……………………14
7-a. Limit the position of mobile i in cell A …20
7-b. Limit the position of mobile j in cell B …………………………………20
8. Average outage probability of mobile j in cell B with 4 interference users vs. the radius Rlimit of the circle in cell A and cell B …………………………………21
9. The locations of mobile i and mobile j in cell A and cell B ……….21
10. The locations of mobile i and mobile j in cell A and cell B …35
11. Limit the positions of users in cell A or in cell B …………35
12. Average outage probability of mobile j in cell B vs. the radius Rlimit of the circle in cell A and cell B in the shadow fading channel during the crossed time slot pair 36
13. Average outage probability of mobile i in cell A vs. the radius Rlimit of the circle in cell B and cell B in the shadow fading channel during the crossed time
slot pair ………………………………………………………36
14. Average outage probability of mobile j in cell B vs. the radius Rlimit of the circle in cell A and cell B in the shadow fading channel during the uplink time slot pair………………………………37
15. Average outage probability of mobile j in cell B vs. the radius Rlimit of the circle in cell A in the shadow fading channel during the downlink time slot pair……………37
16. Example of traffic patterns in cell A and cell B …42
17. Example of the proposed algorithm case 1 …42
18. Example of the proposed algorithm case 2 …42
19. The average outage probability of two classes calls without shadow fading channel when using the proposed algorithm case 1 ……………………………46
20. The average outage probability of two classes calls in the shadow fading channel (8dB variance) with the proposed algorithm case 2 …47


REFERENCE[1]Harri Holma, Sanna Heikkinen, Otto-Aleksanteri Lehtinen, and Antti Toskala, Interference considerations for the time division duplex mode of the UMTS terrestrial radio access, “IEEE Journal on Selected Areas in Communications”, Vol. 18, No. 8, August 2000 [2]S. H. Wie and D. H. Cho, “Time slot allocation scheme based on a region division in CDMA/TDD systems”, IEEE VTC’01. [3]A. Baier, U. C. Fiebig, W. Granzow, W. Koch, P. Teder, and J. Thielecke, “Design study for a CDMA-based third-generation mobile radio system”, IEEE J. Select. Areas Commun., Vol. 12, pp. 733-743,May 1994.[4]D. G. Jeong, C.H. Choi, and W. S. Jeon, “Design and performance evaluation of a new medium access control protocol for local wireless data communications”, IEEE/ACM Trans. Networking, Vol. 3, pp. 742-752, Dec. 1995.[5]Harri Holma, Sanna Heikkinen, Otto-Aleksanteri Lehtinen, and Antti Toskala,“Interference considerations for the time division duplex mode of the UMTS terrestrial radio access”, IEEE Journal on Selected Areas in Communications, Vol. 18, No. 8, August 2000[6]T. Ojanpera and R. Prasad, “An overview of air interface multiple access for IMT-2000/UMTS”, IEEE Commun. Mag., Sept. 1998.[7]R. Prasad, W. Mohr, and W. Konhauser, Eds., Third Generation Mobile Communication Systems, Boston, MA: Artech House, 2000.[8]R. Esmailzadeh, M. Nakagawa, and E. A. Sourour, “Time-division duplex CDMA communications”,” IEEE Personal Commun., Vol. 4, pp. 51-56, Apr. 1997.[9]R. Esmailzadeh, M. Nakagawa, and A. Kajiwara, “Power control in packet switched time division duplex direct sequence spread spectrum communications”, in Proc. IEEE VTC’92, pp. 989-992.[10]K. Miya, M.Watanabe, M. Hayashi, T. Kitade, O. Kato, and K. Homma, “CDMA/TDD cellular systems for the 3rd generation mobile communication”, in Proc. IEEE VTC’97, Phoenix, AZ, May 1997, pp. 820-824.[11]G. Povey, “Frequency and time division duplex techniques for CDMA cellular radio”, in Proc. IEEE ISSSTA’94, Oulu, Finland, July 1994, pp. 309-313.[12]G. J. R. Povey, “Capacity of a cellular time division duplex CDMA system”, IEE Proc. Commun., Vol. 141, No. 5, pp. 351-356, Oct. 1994.[13]H. Holma, G. Povery, and A. Toskala, “Evaluation of interference between uplink and downlink in UTRA/TDD“, in Proc. VTC’99 Fall, Amsterdam, Netherlands, Sept. 19-22, 1999, pp. 2616-2620.[14]S. Heikkinen, System simulations for UMTS TDD and FDD modes, Master’s thesis, Univ. Oulu, Finland/University of Edinburgh, Scotland,1999. Available from Oulu Univ. Library, P.O. Box 4000, FIN-90014 Univ. Oulu, Finland.[15]D. G. Jeong and W. S. Jeon, “A data transmission scheme for CDMA wireless networks based on IS-95”, IEEE Trans. Veh. Technol., Vol. 49, pp. 11-20, Jan. 2000.[16]G. J.R. Povey and M. Nakagawa, “A review of time division duplex-CDMA techniques”, in Proc. ISSSTA’98, 1998, pp. 630-633 [17]K. Miya and et. al, “Wideband CDMA system in TDD mode operation for IMT-2000”, IEICE Tran. Commun. Vol E81-B, No. 7, pp. 1317-1325, July 1998. [18]Martin Haardt, Senior Member, IEEE, Anja Klein, Member, IEEE, Reinhard Koehn, Member, IEEE, Stefan Oestreich, Marcus Purat, Member, IEEE, Volker Sommer, and Thomas Ulrich, “The TD-CDMA based UTRA TDD mode”, IEEE Journal on Selected Areas in Communications, Vol. 18, No. 8, August 2000.[19]Dong Geun Jeong, Member, IEEE, and Wha Sook Jeon, Member, IEEE, “CDMA/TDD system for wireless multimedia services with traffic unbalance between uplink and downlink”, IEEE Journal on Selected Areas in Communications, Vol. 17, No. 5, May 1999 .[20]Dong Geun Jeong, Member, IEEE, and Wha Sook Jeon, Member, “Time slot allocation in CDMA/TDD system for mobile multimedia services”, IEEE Commun. Letters, Vol 4, No 2, pp. 59-61. Fed. 2000.[21]Wha Sook Jeon, Member, IEEE, and Dong Geun Jeong, Senior Member, IEEE,“Comparison of time slot allocation strategies for CDMA/TDD systems”, IEEE Journal on Selected Areas in Communications, Vol. 18, No. 7, July 2000. [22]Z. Pu, X. You, S. Cheng, and H. Wang, “Transmission and reception of TDD multicarrier CDMA signals in mobile communications system”, in Proc. IEEE VTC’99, Houston, TX, May 1999.

QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top