Predictive power estimators in CDMA closed loop power control

J. Tanskanen, A. Huang, I. Hartimo
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引用次数: 17

Abstract

The estimation of signal power is considered. Methods of designing optimized and partially-optimized power estimators, based on the Wiener model, for complex-valued signals are presented. Our application is a predictive received power level estimation in closed loop transmitter power control of mobile CDMA communications systems. The proposed estimators have the benefits of guaranteed positive output, high computational efficiency as compared to quadratic filters, and providing for a predescribed prediction step, all the aspects being of great interest when applying the estimators in delay sensitive closed control loops. The user capacity of a CDMA communications system is generally found to be greatly interference limited, and thus proper power control system functioning is of paramount interest. The partially-optimized power estimators are simulated along with Heinonen-Neuvo (1988) polynomial predictors in singleand multiuser CDMA uplink closed power control loop simulators.
CDMA闭环功率控制中的预测功率估计
考虑了信号功率的估计。提出了基于维纳模型的复值信号优化和部分优化功率估计器的设计方法。我们的应用是在移动CDMA通信系统的闭环发射机功率控制中预测接收功率电平估计。与二次滤波器相比,所提出的估计器具有保证正输出,计算效率高,提供预先描述的预测步骤等优点,这些都是将估计器应用于延迟敏感闭环控制回路时非常感兴趣的方面。通常发现CDMA通信系统的用户容量受到很大的干扰限制,因此适当的功率控制系统功能是最重要的。部分优化的功率估计器与Heinonen-Neuvo(1988)多项式预测器一起在单用户和多用户CDMA上行闭合功率控制环路模拟器中进行了仿真。
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