相干分布式信源参数估计算法  

Parameter Estimation of Coherently Distributed Source

作　　者：韩英华[1] 汪晋宽[1] 宋昕[1] 

机构地区：[1]东北大学信息科学与工程学院,辽宁沈阳110004

出　　处：《系统仿真学报》2007年第12期2694-2697,共4页Journal of System Simulation

基　　金：教育部博士点基金资助项目(20050145019)

摘　　要：针对目前分布式信源参数估计算法多采用二维联合搜索导致计算复杂度较大的问题,提出了基于中心波达方向预估计的波束形成一维搜索算法。通过将中心波达方向与角度扩散进行分离,把二维联合搜索简化为一维搜索,降低了计算复杂度。利用方向向量与信号子空间之间的特征结构预估计中心波达方向,缩小了参数搜索范围,提高了算法运行速度。该算法参数估计精度较高,鲁棒性较好,适用于角度扩散较大的场合。仿真实验验证了所提算法的有效性,与DSPE算法和传播因子算法相比,所提算法性能具有明显的优势。In many parameter estimation approaches for distributed sources, the computational complexity induced by the two-dimensional （2-D） joint searching manipulation is prohibitively high, A one-dimensional （l-D） beamforming searching algorithm based on the pre-estimation of the central direction-of-arrival （DOA ） was proposed. By isolating the central DOA and angular spread into decoupled parts, 2-D joint searching can be simplified to sequential I-D searching, which reduces computational complexity. The central DOA can be pre-estimated by utilizing the eigenstructure between the steering matrix and the signal subspace, which can downsize the searching scope and increase the computational efficiency as well. Simulation results show that the proposed method exhibits the attributes, an improved accuracy and a better robustness, It is also proved to be able to dramatically outperform the DSPE algorithm and propagator method.

关 键 词：相干分布式信源 中心波达方向 角度扩散 波束形成 参数估计 

分 类 号：TN911.7[电子电信—通信与信息系统]