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研究生:劉盈芬
研究生(外文):YingFen Liu
論文名稱:直序式展頻多工通訊在波道重疊下之效能評估
論文名稱(外文):Performance Evaluation for Multiple DSSS Systems with Channel Bands Overlapped
指導教授:陳明輝陳明輝引用關係
指導教授(外文):MingHeui Chen
學位類別:碩士
校院名稱:國立高雄第一科技大學
系所名稱:電腦與通訊工程所
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:96
中文關鍵詞:直接序列展頻跳頻展頻展頻技術直序式展頻多工通訊
外文關鍵詞:FHSSDSSSCDMA/DSSSCDMASSMAspread spectrum technique
相關次數:
  • 被引用被引用:3
  • 點閱點閱:258
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  • 下載下載:48
  • 收藏至我的研究室書目清單書目收藏:0
本研究是在時域及頻域不同情況下,討論直序式展頻(CDMA/DSSS)多工通訊在波道重疊下之效能評估與模擬。首先假設系統是採不同載波頻率、BPSK調變的直序式展頻多工通訊。其次假設所有使用者均具有功率自動調整功能(APC)亦即等功率裝置,並假設在AWGN波道且無信號損失下作系統分析。
接著在兩個直序式展頻多工通訊系統模式中,當不相同展頻碼長,相同載波頻率( )及BPSK調變,在時域下作系統分析模擬,並找到信號雜訊比(SNR)值,更進一步, 假設展頻碼頻速率不同(即 )、展頻碼長不同(即 )、及載波頻率不同(即 )( )。 在頻域情況下,作系統分析並找到信號雜訊比。最後分別在時域與頻域中作數值分析與系統模擬,將得到評估結果作比較,而BER相關的誤差非常接近可以被接受認可的範圍內(10%),由此分析的結果顯示,可得到很好的效能評估數值,且其非常接近Pursly’s[3]的結果。
This study conducts performance evaluation and performs simulation for a code division multiple access (CDMA) system when channel bands of multiple neighboring CDMA/DSSS are overlapped in frequency domain. It is assumed that all systems adopt direct-sequence spread-spectrum (DSSS) technique and are BPSK modulated by the different carrier frequencies. Automatic power control (APC) is also applied in the interfered system such that the receiver gets the same power from all users. Without loss generality, an additive white Gaussian noise (AWGN) channel is also assumed during analysis. In this paper, the analytic solution of the signal to noise ratio (SNR) is first derived[17] in which both CDMA systems are modulated by different carrier frequencies( ). We have the more accurate results by simulation with and , respectively. The relative error of BER by the two approaches are accepted. This analysis is good for general cases; and the results show an excellent computational performance. In particular, the result is very close to Pursly’s result[3], when the systems have the same code length with no carrier difference.
中文摘要  --------------------------------------------------------- i
英文摘要 --------------------------------------------------------- ii
誌謝 --------------------------------------------------------- iii  
目錄 --------------------------------------------------------- iv 
圖目錄 --------------------------------------------------------- v 
第一章緒論--------------------------------------------------------- 1
1.1文獻探討 --------------------------------------------- 1
1.2研究動機 --------------------------------------------- 2
1.3論文結構 --------------------------------------------- 3
第二章展頻通訊簡介-------------------------------------------- 4
2.1展頻通訊簡介-------------------------------------------- 4
2.2展頻通訊之特點----------------------------------------- 5
2.3展頻通訊之分類----------------------------------------- 8
第三章系統及模型----------------------------------------------- 18
第四章分析模型-------------------------------------------------- 25
第五章模擬實驗-------------------------------------------------- 34
第六章結論-------------------------------------------------------- 39
參考文獻------------------------------------------------------------ 41
附錄A ------------------------------------------------------------ 44
附錄B ------------------------------------------------------------ 57
附錄C ------------------------------------------------------------ 60
附錄D ------------------------------------------------------------ 62
附錄E ------------------------------------------------------------ 73
附錄F ------------------------------------------------------------ 75
[1] W. C. Y. Lee, “Overview of cellular CDMA,” IEEE Trans. on Vehi. Tech., vol. VT-40, No. 2, pp.291-302, 1991.[2] R. L. Peterson, R. E. Ziemer and D. E. Borth, Introduction to Spread Sprectrum Communications, P. H. Inc., New Jersey, pp. 53-60, 1995.[3] M. B. Pursley, “Performance Evaluation for Phase-Code Spread-Spectrum Multiple-Access Communication-Part I:System Analysis,” IEEE Trans. on Commun., Vol. COM-25, No. 8, pp.795-799, Aug. 1977.[4] M. B. Pursley and H. F. A. Roefs, “Numerical Evaluation of Correlation Parameters for Optimal Phases of Binary Shift-Register Sequences,” IEEE Trans. on Commun., Vol. COM-27, No. 10, pp.1597-1604, Oct. 1979.[5] D. V. Sarwate, “Bound on Cross-correlation and Autocorrelation of Sequence,” IEEE Trans. on Information Theory, vol. IT 25, No. 6, pp.720-724, Nov. 1979.[6] S. E. EL-Khamy and A. S.Balamesh, "Selection of gold and kasami code for spread spectrum CDMA system of limited number of users", Internation J.of Satellte Commu., Vol.5, pp23-32, 1987.[7] M. B. Pursley, F. D. Garber and J. S. lehnert, “Analysis Generalized Quad-riphase Spread Spectrum Communication,” Proceeding of the IEEE Int. Conf. Commun., Vol. I, pp.15.3.1-15.3.6, Jun. 1980.[8] P. J. E. Jeszensky, “Calculation of the Bit Error Probability in A Direct Secquence Spread Spectrum System with Code Division Multiple Access,” IEEE Internation Tel. Symposium-ITS, pp.12.3.1-12.3.5, 1990.[9] C. L. Weber, G. K. Huth and B. H. Batson, “Performance Considerations of CDMA Systems,” IEEE Trans. on Vehicular Technology, VT-30, No. 1, pp.3-10, Feb.1981.[10] C. Trabelsi and A. Yongacoglu, “Bit-Error-Rate Performance for Asynchronous DS-CDMA over Multipath Fading Channel,” IEE Proc. Commun., Vol. 142, No. 5, pp307-314, Oct. 1995.[11] R. Kohno, R. Meidan and L. B.Milstein, “Spread Spectrum Access Method for Wireless Communications,” IEEE Commun. Magazine, pp.58-67, Jan.1995.[12] S. Kondo and L. B. Milstein, “Performance of Multicarrier DS CDMA Systems,” IEEE Trans. on Commun., Vol. COM-44, No. 2, pp.238-246, Feb. 1996. [13] N. Nazari and R. Ziemer, “Computationally Efficient Bounds for the Per-formance of DS/SSMA Communication System in Jamming Environments,” IEEE Trans.on Commun., Vol. COM-36, No. 5, pp.577-587, May 1988.[14] R. K. Morrow, "Accurate CDMA BER calculations with low computational complexity, " IEEE Trans. Commun., Vol.46, No.11, pp1413-1417, Nov. 1998.[15] R. C. Dixon, Spread Spectrum Systems with Commercial Applications, 3 rd, Wiley & Sons, Inc., pp62-102 and pp410-415, 1994.[16] M. H. Chen, B. H. Lee and C. C. Wu, "Performance Evaluation for Multiple DS-SS Systems with Channel Bands Overlapped, " IEEE International Symposium on PIMRC‘96, pp.803-807, Oct 15-18, 1996.[17] M. H. Chen, B. H. Lee and C. C. Wu, "Performance Evaluation for a Direct-Sequence Spread-Spectrum Multiple-Access Communication System Interfered by Other CDMA/DSSS Systems, " IEICE Transactions, Vol. E83-A, N0. 6, pp1247-1256, June 2000.
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