利用调制引入循环平稳的CDMA盲信道估计

针对CDMA系统给出了一种新颖的盲辨识方法.它利用了恒模复序列调制产生的循环平稳性,其特色是,在接收机上可以根据循环统计量的支撑的不同,将各个用户的二阶循环统计量分离开来,每个用户形成自己的小规模子空间.采用已成熟的子空间方法,可以识别出不同的用户各自的片率传输信道,以便于均衡和检测.文中给出了自己的信道可辨识性的条件和证明,提出了辨识算法,并对算法进行了模拟.方法简单明了,适合于CDMA上行链路信道.

Blind channel estimation for CDMA based on modulation-induced cyclostationarity

In this paper,a novel approach is presented for the CDMA channel identification. The approach makes use of the modulation-induced cyclostationarity to separate the second order cyclic statistics for every user, with the special features of one subspace for one user,and being able to identify individual channels of different users. A new channel identifiability condition with its proof is included in the paper. Finally, the identification algorithm is given with simulation results. The approach is rather simple,suitable for the CDMA uplink.