快速衰落信道中信道估计误差与多普勒分集

Conference Record of the Thirty-Fourth Asilomar Conference on Signals, Systems and Computers (Cat. No.00CH37154) Pub Date : 2000-10-29 DOI:10.1109/ACSSC.2000.910658

M. Baissas, A. Sayeed

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引用次数: 2

摘要

研究了信道估计误差和多普勒分集对快速衰落下相干CDMA接收机性能的影响。一个关键的信道特性控制性能是信道保持强相关的相干时间。我们分析了一种利用联合多径多普勒分集的时频RAKE接收机结构。信道估计误差的建模是基于根据接收机结构定制的基于导频的估计器的性能。研究表明，总体性能受到两种相互竞争的影响:较短的相干时间导致信道估计下降，但固有的(多普勒)分集较高，而较长的相干时间则相反。我们的研究结果表明，多普勒分集增益在某些条件下占主导地位，并且可以显著降低困扰传统CDMA接收机在快速衰落下性能的错误概率下限。

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Channel estimation errors versus Doppler diversity in fast fading channels

This paper studies the impact of channel estimation errors and Doppler diversity on the performance of coherent CDMA receivers under fast fading. A key channel characteristic controlling performance is the coherence time over which the channel remains strongly correlated. We analyze a time-frequency RAKE receiver structure that exploits joint multipath-Doppler diversity. Modeling of channel estimation errors is based on the performance of pilot-based estimators tailored to the receiver structure. It is shown that the overall performance is controlled by two competing effects: shorter coherence times lead to degraded channel estimation but inherently higher (Doppler) diversity, with opposite effects for longer coherence times. Our results demonstrate that Doppler diversity gains dominate under certain conditions and can significantly mitigate the error probability floors that plague the performance of conventional CDMA receivers under fast fading.

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Conference Record of the Thirty-Fourth Asilomar Conference on Signals, Systems and Computers (Cat. No.00CH37154)

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