CDMA系統(tǒng)中時空信道沖激響應的估計與跟蹤
THE SPACE-TIME CHANNEL IMPULSE RESPONSE ESTIMATION AND TRACKING FOR CDMA
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摘要: 時空信道可以用矢量信道沖激響應(VCIR)來描述,正確估計與跟蹤時變的VCIR是智能天線技術實現的關鍵。本文利用子空間技術得到CDMA系統(tǒng)中各用戶VCIR的估計值,結合近似子空間跟蹤方法實現了對VCIR的跟蹤,跟蹤過程所需的運算量小。計算機仿真實驗表明,跟蹤的速度及精度基本可以滿足智能天線系統(tǒng)的要求。
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關鍵詞:
- 智能天線; 時空信道; 子空間跟蹤
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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