非周期扩频系统中基于均匀圆阵的角度和时延的联合估计
Joint angle and delay estimation based on uniform circular array in CDMA system with aperiodic spreading code
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摘要: 该文通过空域匹配滤波器,将阵元空间中的均匀圆阵转化为波束空间中的均匀线阵,并将时空匹配滤波器的输出转换到频域,利用 DOA Matrix方法解决了非周期扩频系统中均匀圆阵条件下多径信号的角度和时延的联合估计问题及常规空域处理方法中多径数不能大于阵元数的问题。理论分析和仿真实验结果表明,该方法是一种无偏估计,且其估计精度远远高于滑动相关方法。Abstract: The uniform circular array is transformed into uniform linear array by the spatial matched filter transformation from element space to beam space. Based on the space-time matched filter output in frequency domain, the joint angle and delay estimation with uniform circular array in aperiodic spreading system is solved with DOA matrix method. The joint estimation algorithm also solved the problem, that the multipath number can not be larger than the element number in conventional spatial processing method. The theoretical analysis and computer simulations demonstrate that the method is an unbiased estimator and its estimation precision is superior to that of the sliding correlator.
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