基于空域信道跳变抗干扰DOA估计方法  

An anti-jamming DOA estimation method with space hopping

作　　者：郭素霞[1] 李翔宇[1] 金梁[1] 刘璐[1] 季新生[1,2] 

机构地区：[1]国家数字交换系统工程技术研究中心,郑州450002 [2]东南大学移动通信国家重点实验室,南京210096

出　　处：《中国科学：信息科学》2016年第7期899-912,共14页Scientia Sinica(Informationis)

基　　金：国家自然科学基金(批准号:61471396;61501516;61521003);国家高技术研究发展计划(863计划)(批准号:2014AA01A704);军内科研项目(批准号:20140128);东南大学移动通信国家重点实验室开放研究基金资助课题(课题编号:2013D09)资助项目

摘　　要：针对信源与干扰来波方向接近时,传统子空间估计方法 "秩亏"导致DOA失效的问题,通过引入可控的人工跳空信道及跳空图案,使信源在一个码元周期内的等效空域信道动态变化,以加大信源和干扰的信道特征差异,从而有效规避干扰的影响,解决了信源和干扰DOA估计的分辨问题.由于N次跳变可等效地在空域衍生出N对虚拟阵列,因此可成倍扩展虚拟阵列数及子空间维度,提高了DOA估计的分辨性能.仿真结果验证了该算法的有效性.The conventional subspace method cannot accurately estimate the direction of arrival（DOA） of the signal with the presence of a jammer close to it because their combined channel matrix rank is deficient. The paper proposes a novel anti-jamming DOA estimation method by introducing an artificially controllable space-hopping channel and space-hopping pattern. The method causes the equivalent spatial channel of the signal to change dynamically in a symbol cycle, which can promote the channel difference between the jammer and signal source.Therefore, the method can prevent the jammer from influencing the signal, and improve the resolution of the DOA estimation. Because N hops are equivalently regarded as spawning N pairs of virtual arrays in space, the virtual elements and the subspace dimension are greatly increased, which can greatly improve the performance of DOA estimation. The simulation results verify the effectiveness of the algorithm.

关 键 词：抗干扰 DOA估计 空域跳变 跳空图案 虚拟阵列 

分 类 号：TN911.4[电子电信—通信与信息系统]