CDMA系统中时空信道冲激响应的估计与跟踪
THE SPACE-TIME CHANNEL IMPULSE RESPONSE ESTIMATION AND TRACKING FOR CDMA
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摘要: 时空信道可以用矢量信道冲激响应(VCIR)来描述,正确估计与跟踪时变的VCIR是智能天线技术实现的关键。本文利用子空间技术得到CDMA系统中各用户VCIR的估计值,结合近似子空间跟踪方法实现了对VCIR的跟踪,跟踪过程所需的运算量小。计算机仿真实验表明,跟踪的速度及精度基本可以满足智能天线系统的要求。
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关键词:
- 智能天线; 时空信道; 子空间跟踪
Abstract: Space-time channel can be described by Vector Channel Impulse Response (VCIR). Estimating and tracking the time varying VCIR is very important for smart antenna systems. In this paper an estimation and tracking method has been proposed. In this method, subspace technology has been used to estimate the VCIR, and approximate subspace tracking technology has been used to track the time varying VCIR. The tracking process has low computation burden. The computer simulation demonstrates that the VCIR tacking speed and accuracy can meet the need of smart antenna systems. -
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