(3.238.96.184) 您好!臺灣時間:2021/05/12 15:41
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:陳俊傑
研究生(外文):Jun-Jie Chen
論文名稱:多速率跳頻無線通訊系統之設計及效能分析
論文名稱(外文):Design and Performance Analysis for Multi-Rate MFSK/FH-CDMA Wireless Communication Systems
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
中文關鍵詞:無線通訊系統跳頻通訊系統
外文關鍵詞:Wireless Communication SystemsFrequency-Hopping Systems
相關次數:
  • 被引用被引用:0
  • 點閱點閱:74
  • 評分評分:系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
在大部分的無線跳頻系統中,通常只能提供單一媒體服務,然而人們期望在未來的無線通訊環境中,對於不同的品質需求能夠提供具有彈性的多媒體服務。在本篇論文中,我們提出一種藉由改變跳頻系統每一個時槽中頻率跳躍數目的方式來達成多速率的目的,而這種達成多速率的方式並不會造成跳頻碼的浪費。此外,我們也對此多速率系統做了分析,從分析的結果來看,我們提出的這種方法的確能有效的應用於無線多媒體服務系統。
除此之外,我們也建構了一種新的跳頻碼,這種跳頻碼的長度為P3,其中P為一個質數,個數為P3-P個,任兩個跳頻碼之間互相關性為4。這P3-P個跳頻碼可以分成P(P+1)組,每一組中有P-1個碼,在同一組中的任兩個跳頻碼的互相關性可以降至1。藉由這樣的特性,我們可以將同一組的跳頻碼先分配給系統中的用戶以得到最佳的效能,因為這樣的跳頻碼具有良好的相關性,所以非常適合應用於未來的無線通訊系統。

Most studies on multilevel frequency-shift keying/frequency-hopping code-division multiple-access (MFSK/FH-CDMA) wireless
systems are assumed to support only one type of medium.
It is expected a flexible support of multi-media services with
different quality requirements in the future wireless systems.
In this thesis, an FH-CDMA technique is proposed to provide multi-rate services by varying the number of hopping frequencies per chip assigned to a user. This new scheme can support the multi-rate services without resulting in the reduction of sequence consumption. The performance of the new multi-media MFSK/FH-CDMA wireless systems is analyzed.
Our results show that the proposed scheme is useful for FH-CDMA
wireless systems with multi-media services. Furthermore, a new construction of FH patterns, which is called generalized concatenated prime codes, has been provided for MFSK/FH-CDMA systems. We have constructed P^3-P FH patterns with
length P^3 and maximum cross-correlation of four.
These P^3-P FH patterns can be partitioned into P(P+1) groups, and the maximum cross-correlation in each group can be reduced to one. For this characteristic, we assign FH patterns in the same group first to the users within the system to gain optimal performance. Owing to the low cross-correlation property, the new designed codes will be useful in future wireless communication systems.

Chapter1 Introduction ..................................1
1.1 Background .........................................1
1.1.1 DS-CDMA Systems ..................................3
1.1.2 FH-CDMA Systems ..................................4
1.2 Motivation and Outline of Thesis ...................5
Chapter2 Multi-Hop MFSK/FH-CDMA Wireless Systems .......7
2.1 Introduction .......................................7
2.2 Rate-Variable Scheme ..............................10
2.3 Performance Analysis ..............................14
2.4 Numerical and Simulation Results ..................17
2.5 Summary ...........................................20
Chapter3 Generalized Concatenated Prime Codes .........25
3.1 Introduction ......................................25
3.2 Constructions .....................................27
3.3 Summary ...........................................30
Chapter4 Conclusions ..................................32
Appendix A ............................................36
Appendix B ............................................39
Appendix C ............................................41

[1] Simon Haykin, "Communication Systems," John Wiley,
third edition, 1994.
[2] G. L. Turin, "Introduction to spread spectrum antimultipath
techniques and their applications to urban digital radio," Proc. IEEE, vol. 68, pp. 328-353, 1980.
[3] D. J. Goodman, P. S. Henry and V. K. Prabhu,
"Frequency-hopping multilevel FSK for mobile radio,"
Bell Syst. Tech. J., vol. 59, no. 7, pp. 1257-1275, Sept. 1980.
[4] G. Einarsson, "Address assignment for a time-frequency,
coded, spread-spectrum system," Bell Syst. Tech. J., vol. 59, no. 7, pp. 1241-1255, Sep. 1980.
[5] S. Maric, "Construction of optimal frequency hopping sequences for minimising bit errors in selective fading channels
characteristic to digital cellular systems," IEE Proc.-Commun., vol. 142, no. 4, pp. 271-273, Aug. 1995.
[6] G.-C. Yang and W. C. Kwong, "Frequency-hopping codes
for multimedia services in mobile telecommunications," IEEE Trans. Veh. Tech., vol. 48, no. 6, pp. 1906-1915, Nov. 1999.
[7] G.-C. Yang, S.-Y. Lin and W. C. Kwong, "MFSK/FH-SSMA
wireless systems with double-media services over fading channels," IEEE Trans. Veh. Tech., vol. 49, no. 3, pp. 900-910, May 2000.
[8] C.-L. I and R. D. Gitlin, "Multi-code CDMA wireless
personal communications networks," in Proc. IEEE Int. Conf. Commun. (ICC'95), Seattle, WA, pp. 1060-1064, June 1995.
[9] T. Mabuchi, R. Kohno and H. Imai, "Multihopping and
decoding of error-correcting code for MFSK/FH-SSMA systems,"
IEICE Trans. Commun., vol. E76-B, no. 8, pp. 874-884, Aug. 1993.
[10] N. Guo and L. B. Milstein, "On rate-variable
multidimensional DS/SSMA with sequence sharing," IEEE J. Select. Areas Commun., vol. 17, no. 5, pp. 902-917, May 1999.
[11] T. Mabuchi, R. Kohno and H. Imai, "Multiuser detection
scheme based on canceling cochannel interference for MFSK/FH-SSMA system," IEEE J. Select. Areas Commun., vol. 12, no. 4, pp. 593-604, May 1994.
[12] W. C. Jakes, Jr., "Microwave Mobile Communications",
New York: Wiley, 1974.
[13] M. Schwartz, W. R. Bennett and S. Stein. "Communication Systems and Techniques", New York: McGraw-Hill, 1966.
[14] J.-J. Chen and G.-C. Yang, "CDMA fiber-optic systems with
optical hard-limiters," J. Lightwave Technol., under revision.
[15] S. B. Wicker and V. K. Bhargava, "Reed-Solomon Codes and Their Applications", Piscataway, NJ: IEEE Press, 1994.
[16] A. Shaar and P. Davies, "Prime sequences: Quasi-optimal
sequences for OR channel code division multiplexing," Electron. Lett., vol. 19, no. 21, pp. 888-890, 1983.
[17] C.-F. Hong and G.-C. Yang, "Concatenated prime codes," IEEE commun. Lett., vol. 3, no. 7, July 1999.
[18] A. Leon-Garcia, "Probability and Random Processes
for Electrical Engineering", 2nd Ed., Addison-Wesley, 1994.
[19] D. Lay, "Linear Algebra and Its Applications",
Addison-Wesley, 1994.

QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top
系統版面圖檔 系統版面圖檔