W-CDMA downlink performance degradation due to multipath interference and channel estimation errors

The 57th IEEE Semiannual Vehicular Technology Conference, 2003. VTC 2003-Spring. Pub Date : 2003-04-22 DOI:10.1109/VETECS.2003.1207806

Y. Socratous, M. Dohler, H. Aghvami

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Abstract

The aim of this paper is to quantify the performance of a W-CDMA system in dependency of a giver power delay profile (PDP) and channel estimation errors. The analysis extends the previously published work by Adachi [F. Adachi, Nov. 1997], which assumes ideal channel estimation and multipath tracking. For the analytical expressions a particular channel estimation technique was taken into account and a practical pilot symbol assisted technique was used to derive the channel estimation error. By combining both, the performance degradation due to multiple access interference (MAI) and due to channel estimation errors, an easy to use conditional SINR is derived. Assuming BPSK data modulation for simplicity, the downlink performance in terms of the average BER-vs.-SINR was evaluated by means of Monte Carlo simulation for different PDPs. It could be shown that the performance severely depends on the power distribution of the multipath components and the available number of pilot symbols, which determines the reliability of the estimated channel necessary to perform coherent demodulation.

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多径干扰和信道估计误差导致的W-CDMA下行链路性能下降

本文的目的是量化W-CDMA系统在给予者功率延迟曲线(PDP)和信道估计误差依赖下的性能。该分析扩展了Adachi [F。Adachi，十一月1997]，它假设理想的信道估计和多径跟踪。对于解析表达式，考虑了一种特殊的信道估计技术，并采用一种实用的导频符号辅助技术推导了信道估计误差。结合多址干扰(MAI)和信道估计误差导致的性能下降，推导出易于使用的条件信噪比。假设BPSK数据调制为简单起见，下行链路性能以平均BER-vs。通过蒙特卡罗模拟对不同pdp的sinr进行了评估。可以看出，性能严重依赖于多径分量的功率分布和可用导频符号的数量，这决定了进行相干解调所需的估计信道的可靠性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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The 57th IEEE Semiannual Vehicular Technology Conference, 2003. VTC 2003-Spring.

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