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文中研究了DS-CDMA移动通信系统中一种基于维纳滤波器的抗多址干扰MAI(Multiple Access Interfere)的新方法——辅助矢量滤波器AVF(Auxiliary Vector Filter),该滤波器基于维纳滤波器,重新构造出接收信号,引入辅助矢量的概念,使辅助矢量完全正交于干扰矢量,这样就能达到完全消除系统中多址干扰的目的,同时推导出了辅助矢量和权系数的求解公式。该方法具有无需求逆矩阵,可运用于下行链路,便于盲实现,计算复杂度低等优点。仿真结果表明:在DS-CDMA移动通信系统中,信道噪声为加性高斯白噪声信道(AWGN),不同的干扰强度和不同的干扰用户数两种环境下,辅助矢量滤波器有着较低的误码率,能够有效地去除DS-CDMA系统中的多址干扰,性能要优于传统相关滤波器以及多用户检测技术中的解相关算法和最小均方误差算法(MMSE)。
A new method based on Wiener filter MAI (Multiple Access Interfere) in DS-CDMA mobile communication system is studied-Auxiliary Vector Filter (AVF) Filter to reconstruct the received signal and introduce the concept of auxiliary vector so that the auxiliary vector is completely orthogonal to the interference vector so that the multiple access interference in the system can be completely eliminated. At the same time, the solution of auxiliary vector and weight coefficient formula. The method has the advantages of no inverse matrix, applicable to the downlink, easy to implement in the blind, low computational complexity. The simulation results show that in the DS-CDMA mobile communication system, the auxiliary vector filter has a lower error in two environments, the channel noise is additive white Gaussian noise channel (AWGN), different interference intensity and different number of interfering users The code rate can effectively remove the multiple access interference in DS-CDMA system, and the performance is better than that of the traditional correlation filter and the multi-user detection technique and the minimum mean square error algorithm (MMSE).