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異步帶限D(zhuǎn)S-CDMA系統(tǒng)中基于子空間的時(shí)延估計(jì)算法

霍建國,  程云鵬,  蔡躍明

霍建國, 程云鵬, 蔡躍明. 異步帶限D(zhuǎn)S-CDMA系統(tǒng)中基于子空間的時(shí)延估計(jì)算法[J]. 電子與信息學(xué)報(bào), 2001, 23(11): 1204-1210.
引用本文: 霍建國, 程云鵬, 蔡躍明. 異步帶限D(zhuǎn)S-CDMA系統(tǒng)中基于子空間的時(shí)延估計(jì)算法[J]. 電子與信息學(xué)報(bào), 2001, 23(11): 1204-1210.
Huo Jianguo, Cheng Yunpeng, Cai Yueming . SUBSPACE-BASED TIME DELAY ESTIMATION FOR ASYNCHRONOUS BANDLIMITED DS-CDMA SYSTEMS[J]. Journal of Electronics & Information Technology, 2001, 23(11): 1204-1210.
Citation: Huo Jianguo, Cheng Yunpeng, Cai Yueming . SUBSPACE-BASED TIME DELAY ESTIMATION FOR ASYNCHRONOUS BANDLIMITED DS-CDMA SYSTEMS[J]. Journal of Electronics & Information Technology, 2001, 23(11): 1204-1210.

異步帶限D(zhuǎn)S-CDMA系統(tǒng)中基于子空間的時(shí)延估計(jì)算法

SUBSPACE-BASED TIME DELAY ESTIMATION FOR ASYNCHRONOUS BANDLIMITED DS-CDMA SYSTEMS

  • 摘要: 該文提出了適合于異步帶限D(zhuǎn)S-CDMA系統(tǒng)的時(shí)延估計(jì)算法。該算法基于子空間概念,首先估計(jì)噪聲子空間,然后進(jìn)行時(shí)延的粗略估計(jì)和精確搜索。分析了該算法的性能,并進(jìn)行了計(jì)算機(jī)仿真。結(jié)果表明,該算法具有抗遠(yuǎn)近效應(yīng)能力,對(duì)用戶數(shù)目也具有一定的魯棒性,并且大大提高了時(shí)延估計(jì)精度,降低了時(shí)延估計(jì)過程的運(yùn)算量。
    Abstract: An algorithm for time delay estimation in asynchronous band-limited DS-CDMA systems is presented. The algorithm is based on subspace concept. The noise subspace is estimated first, and then coarse estimation and fine search of time delay are implemented sequentially. The performance of the algorithm is analyzed, and simulations are carried out. The results show that the algorithm is near-far resistant and robust to the number of users partly, the estimation accuracy is improved greatly, and the required computation is reduced.
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  • E.G. Strom, S. Parkvall, S. L. Miller, et al., Propagation delay estimation in asynchronous DSCDMA systems, IEEE Trans. on Commun., 1996, 44(1), 84-93.[2]T. Ostman, S. Parkvall, B. Ottersten, Analysis of an improved MUSIC algorithm for es-timation of time delays in asynchronous DS-CDMA systems, available by URL, http:∥www.kth.se /s3 /signal / IND EX.html[3]T. Ostman, B. Ottersten, Near far robust time delay estimation in asynchronous bandlimitedDS-CDMA systems, available by URL, http:∥ www.kth.se/s3/signal/ INDEX.html[4]R.D. Gaudenzim, F. Giannetti, M. Luise, Signal recognition and signature code acquisition inCDMA mobile packet communication, IEEE Trans. on VT, 1998, 47(1), 196 208.[5]M. Bhandary, Detection of the number of signals in the presence of white noise in decentralizedprocessing, IEEE Trans. on SP, 1998, 46(3), 800 803.[6]陳寶林著,最優(yōu)化理論與算法,北京,北京大學(xué)出版社,1989,第五章.[7]Chu Lichung, U. Mitra, Analysis of MUSIC-based delay estimators for DS-CDMA systems, IEEETrans. on Commun., 1999, 47(1), 100-105.[8]T. Ostman, On the bounds of performance in communication system, available by URL,http:∥www.kth.se/s3/signal/ INDEX.html.
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出版歷程
  • 收稿日期:  1999-08-18
  • 修回日期:  2000-05-30
  • 刊出日期:  2001-11-19

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