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为了对多用户宽带码分多址信号的信源信息进行估计,首先利用阵列天线空域滤波对多用户信号进行分离,然后利用主分量分析结合锁相环技术,估计不同用户的信源信息。所提方法,在载波频率未知情况下,利用宽带码分多址信号中扰码和OVSF码叠加序列的帧重复性,进行帧等间隔采样,构建载波调制的宽带码分多址信号模型进行盲解码。仿真结果表明,本文方法可以有效对多用户WCDMA信号的信源信息进行盲解码。
In order to estimate the source information of multi-user wideband code division multiple access signals, firstly the multi-user signals are separated by spatial filtering of array antennas, and then the principal component analysis and phase-locked loop technique are used to estimate the source information of different users. The proposed method utilizes the frame repetition of the scrambling code in the wideband code division multiple access signal and the superimposed sequence of the OVSF code to sample the frames at equal intervals when the carrier frequency is unknown and constructs a carrier modulated wideband code division multiple access signal model for blind decoding. The simulation results show that this method can effectively decode the source information of multi-user WCDMA signals blindly.