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针对宽带码分多址 (CDMA)系统中同时存在多址干扰与码间串扰的情况进行研究 ,给出了适用于宽带CDMA系统的卷积模型 .利用子空间技术及已知的扩频码信息 ,将适用于单用户的单输入多输出系统信道盲估计方法扩展到码分多址系统中 ,实现了多用户上行信道的盲估计 .利用有限码集特性 ,解决了上行信道盲估计中存在不确定复系数的问题 .在此基础上 ,给出了最小均方误差多用户检测器的实现方案 .计算机仿真实验证明 ,提出的方法可以同时克服多址干扰及码间串扰 ,是实现宽带码分多址系统多用户检测的一个有效途径 .同时该方法还可以推广到基站采用智能天线的系统中 ,实现对矢量信道冲激响应的盲估计 .
Aiming at the coexistence of multiple access interference and intersymbol interference in wideband code division multiple access (CDMA) system, a convolution model suitable for wideband CDMA system is given.Using subspace technology and known spreading code information , A single-input multi-output system blind channel estimation method is extended to code division multiple access system to realize the blind estimation of multi-user uplink channel.Using the characteristics of the limited code set, To determine the complex coefficient of the problem.On this basis, given the minimum mean square error of multi-user detector implementation.Computer simulation experiments show that the proposed method can overcome multiple access interference and inter-symbol crosstalk is to achieve wideband code points An effective way of multi-user detection of multiple-access system.At the same time, the method can also be extended to a base station using a smart antenna system to achieve blind estimation of the impulse response of the vector channel.