異步DS-CDMA盲多用戶檢測
Blind Multiuser Detection for Asynchronous DS-CDMA
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摘要: 該文研究了頻率選擇性瑞利衰落信道中的異步DS-CDMA系統(tǒng)盲多用戶檢測。提出一種期望信號矢量估計方法,該方法同時利用了多徑傳播和接收機同步失調的特性,以利于把盲線性濾波優(yōu)化技術應用于穩(wěn)健的干擾抑制。為了抑制多址干擾(MAI),提出一種基于投影的輔助矢量(PAV)算法。該算法計算復雜度低,特別適用于短數據采樣時濾波矢量的快速優(yōu)化,仿真結果表明在低輸入信號干擾噪聲比(SINR)時能提供有效的干擾抑制,在高輸入SINR時具有穩(wěn)健的性能。Abstract: This paper investigates blind multiuser detection for asynchronous DS-CDMA in frequency selective Rayleigh fading channel. A method of estimating the desired signal vector is presented. The method not only exploits the characteristics of multipath propagation but also the characteristics of timing-offsets which may occur in the receiver, to facilitate the application of a blind linear filter-optimization technique to robust interference suppression. To suppress Multiuser Access Interference (MAI), a Projection-based Auxiliary Vector (PAV) algorithm is proposed. The algorithm has low computation complexity, especially suitable for fast optimization of filter vector with short data samples. It can provide efficient interference suppression in low input SINR, and shows robust performance in high input SINR.
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