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異步DS-CDMA系統(tǒng)中相對時延對多用戶檢測的性能影響: 分析與評估

王伶,  焦李成,  陶海紅,  劉芳

王伶, 焦李成, 陶海紅, 劉芳. 異步DS-CDMA系統(tǒng)中相對時延對多用戶檢測的性能影響: 分析與評估[J]. 電子與信息學(xué)報, 2005, 27(10): 1605-1612.
引用本文: 王伶, 焦李成, 陶海紅, 劉芳. 異步DS-CDMA系統(tǒng)中相對時延對多用戶檢測的性能影響: 分析與評估[J]. 電子與信息學(xué)報, 2005, 27(10): 1605-1612.
Wang Ling, Jiao Li-cheng, Tao Hai-hong, Liu Fang. Effect of Relative Delay on Performance of Multiuser Detection in Asynchronous DS-CDMA Systems: Analysis and Evaluation[J]. Journal of Electronics & Information Technology, 2005, 27(10): 1605-1612.
Citation: Wang Ling, Jiao Li-cheng, Tao Hai-hong, Liu Fang. Effect of Relative Delay on Performance of Multiuser Detection in Asynchronous DS-CDMA Systems: Analysis and Evaluation[J]. Journal of Electronics & Information Technology, 2005, 27(10): 1605-1612.

異步DS-CDMA系統(tǒng)中相對時延對多用戶檢測的性能影響: 分析與評估

Effect of Relative Delay on Performance of Multiuser Detection in Asynchronous DS-CDMA Systems: Analysis and Evaluation

  • 摘要: 多用戶檢測技術(shù)是DS-CDMA系統(tǒng)中的關(guān)鍵技術(shù)之一。在反向鏈路的基站接收機一端，接收信號是各用戶異步發(fā)射信號經(jīng)傳輸信道后的疊加，許多多用戶檢測器的輸入是對系統(tǒng)中各用戶用特征波形匹配濾波后以符號速率采樣的信號。然而，異步用戶間不同的相對時延將引起不等的部分互相關(guān)系數(shù)，從而也導(dǎo)致不一樣的多用戶檢測性能。該文分析了平均部分互相關(guān)系數(shù)的解析表達式并給出了計算方法，采用進化算法求解最大以及最小部分互相關(guān)系數(shù)存在的相對時延條件，提出了異步系統(tǒng)中多用戶檢測在平均、最大以及最小部分互相關(guān)系數(shù)條件下的性能分析與評估方法，對分析和比較多用戶檢測接收機整體性能具有很大意義。
    Abstract: Multiuser detection is a key technique in DS CDMA systems. The received signal of uplink receiver is superposition of the spreading signal transmitted by users over asynchronous channels. Many multiuser detectors deal with discrete signal sampled at symbol or chip rate after passing through matched filterers. However, different relative delay between users results in distinct partial correlation coefficients thus bringing about distinct performance of multiuser detectors. It is very important to effectively evaluate the average and extreme performance of system. In this paper, the expression of average partial correlation coefficients is analyzed and the corresponding numerical computation method is proposed. On the other hand, relative delay corresponding to the maximal and minimal correlation coefficients is also solved by the evolution algorithm. Based on the obtained results, the performance of the decorrelating and Minimum Mean Square Error (MMSE) multiuser detectors in asynchronous DS-CDMA systems are evaluated by numerical simulation.
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  • Adachi F, Sawahashi M, Suda H. Wideband DS-CDMA for next generation mobile communications systems. IEEE Comm- unication Magazine, 1998, 36(9): 56-69.[2]McCormick A C, Al-Susa E A. Multicarrier CDMA for future generation mobile communication[J].Electronics Communication Engineering Journal.2002, 14(2):52-60[3]尤肖虎, 曹淑敏, 李建東. 第三代移動通信系統(tǒng)發(fā)展現(xiàn)狀與展望. 電子學(xué)報, 1999, 27(11A): 3-8.[4]Verdu S. Multiuser Detection. UK: Cambridge University Press, 1998, Chapter 1 Chapter 6.[5]Paris B P. Finite precision decorrelating receivers for multiusers CDMA communication systems[J].IEEE Trans. on Comm.1996, 44(4):496-507[6]王伶, 焦李成, 劉芳. 一種去偏解相關(guān)多用戶檢測器. 信號處理, 2002, 18(3): 208-211.[7]Madhow U. MMSE interference suppression for timing acquisiti-on and demodulation in direct-sequence CDMA systems. IEEETrans. on Communications, 1998, 46(8): 1065-1075.[8]Patel P, Holtzman J. Analysis of a simple successive interference cancellation scheme in DS/CDMA system[J].IEEE Journal on Selected Areas in Communications.1994, 12(5):796-807[9]Varanasi M K, Aazhang B. Multistage detection in asynchronous code-division multiple-access communications[J].IEEE Trans. on Communications.1990, 38(4):509-519[10]Aazhang B, Paris B P, Orsak G C. Neural networks for multiuser detection in CDMA communications[J].IEEE Trans. on Comm.1992, 40(7):1212-1222[11]王伶, 焦李成, 劉芳. 一種子波網(wǎng)絡(luò)空時多用戶檢測器. 自然科學(xué)進展, 2002, 12(1): 90-94.[12]Zhang X D, Wei W. Blind adaptive multiuser detection based on Kalman filtering[J].IEEE Trans. on Signal Processing.2002, 50(1):87-95[13]張賢達, 保錚. 通信信號處理. 北京: 國防工業(yè)出版社, 2000: 420-482.[14]王伶. 移動通信中的多用戶檢測與自適應(yīng)空時接收機研究. [博士論文], 西安： 西安電子科技大學(xué), 2004.[15]歸行茂, 李重華, 柴常智. 數(shù)學(xué)手冊. 上海: 上?？茖W(xué)普及出版社, 1993: 623-627.[16]陳國良, 王煦法, 莊鎮(zhèn)泉等. 進化算法及其應(yīng)用. 北京: 人民郵電出版社, 1996: 1-163.[17]Wang L, Jiao L C. Evolutionary algorithm based on immune strategy. Chinese Journal of Electronics, 2001, 10(2): 170-174.[18]Earg V K. IS-95 CDMA and CDMA2000: Cellular/PCS systems[19]implementation (影印板). 北京: 電子工業(yè)出版社, 2002: 353-398.[20]Du H F.[J].Jiao L C, Liu R C. Adaptive polyclonal programmingalgorithm with applications. Proceeding of the Fifth International Conference on Computational Intelligence and Multimedia Applications, Xian.2003,:-
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  • 收稿日期:  2004-05-08
  • 修回日期:  2005-01-18
  • 刊出日期:  2005-10-19

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