智能天线中阵列信号处理算法的研究

【作者】 曹东；

【导师】 叶晓东；

【作者基本信息】 南京理工大学 ， 通信与信息系统， 2004， 硕士

【摘要】 本文主要研究了智能天线应用中的多种阵列信号处理算法。首先分析了一种基于平行阵的二维方向角自动配对方法，指出了其中方法性能缺陷的理论原因。提出了改进的特征结构子空间算法，采用二维联合估计方法，解决了原算法存在的角度估计模糊问题。提出采用L型阵列并构造虚拟阵元以优化二维方向估计阵列结构。其次本文研究了基于圆阵的波达方向估计MUSIC算法，对算法进一步改进完善。针对原算法不能处理相干信号的问题，提出应用Relax方法解决。最后本文针对宽带波束形成器设计，分析了不同的MSE优化准则，分别研究了基于Toeplitz矩阵和基于LMS的快速权值求解算法。并比较了均匀阵和非均匀阵条件下对波束形成器设计的影响。本文的主要研究手段是采用科学和工程计算语言MATLAB进行仿真验证。更多还原

【Abstract】 The main researches of this dissertation are array signal processing algorithms for the application of smart antenna. Firstly based on the parallel array, an algorithm for matching the ESPRIT’s estimation of two-dimensional angle is analyzed. Theoretical reasons of the performance shortage are pointed out. A new approach is presented of the eigen-structure subspace algorithms, the problem of ambiguous estimation in the original algorithm is solved and array architecture is optimized. Secondly based on the circle array, it studies DOA estimation in the presence of MUSIC algorithm. Under the condition of coherent signals, the Relax algorithm together with preprocessing is proposed for the estimation of DOA based on UCL. Finally the broadband beamforming is considered. A series of optimal criterion for MSE are analyzed. To estimate the weight vector, fast algorithms are presented by using the Toeplitz matrix and LMS algorithm. Computer simulation is carried out to validate the above feasibilities by the research tool of the software MATLAB.更多还原