Performance evaluation of received power estimation for power control in CDMA systems

Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367) Pub Date : 2002-08-07 DOI:10.1109/VTC.2002.1002864

M. L. Sim, H. Chuah

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引用次数: 2

Abstract

Transmitter power control is an effective scheme to improve the performance of cellular DS/CDMA systems. In the reverse link, time-multiplexed pilot symbols are used to assist the estimation of received signal power in order to improve the performance of power control. In this paper, two different approaches for received power estimation in power controlled CDMA systems are proposed and compared in terms of bit error rate (BER) by means of analytical and simulation studies. The first power estimator uses a simple sample average and the second power estimator uses a minimum mean square error (MMSE) filter approach. The MMSE approach requires knowledge of the Doppler spread and the signal-to-interference ratio (SIR). Comparison of the performance of the two power estimators is done with respect to deviations in the SIR and Doppler spread as used for the design of the MMSE filter, from their nominal values. Analysis results show that when the MMSE filter approach is used, BER can be further improved as compared to the simple sample average power estimator.

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CDMA系统功率控制中接收功率估计的性能评价

发射机功率控制是提高蜂窝DS/CDMA系统性能的一种有效方案。在反向链路中，采用时复用导频符号辅助接收信号功率的估计，以提高功率控制的性能。本文提出了两种不同的功率控制CDMA系统接收功率估计方法，并通过分析和仿真研究，从误码率(BER)的角度对两种方法进行了比较。第一个功率估计器使用简单的样本平均，第二个功率估计器使用最小均方误差(MMSE)滤波方法。MMSE方法需要了解多普勒扩频和信干扰比(SIR)。两种功率估计器的性能比较是根据用于MMSE滤波器设计的SIR和多普勒扩频偏离其标称值进行的。分析结果表明，与简单的样本平均功率估计相比，采用MMSE滤波方法可以进一步提高误码率。

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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Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367)

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