The performance the quaternion-Capon（ Q-Capon） beamformer degraded when suppressing the interferences that are coherent with the signal of interest（ SOI）. To tackle the problem,the spatial smoothing technique is a...The performance the quaternion-Capon（ Q-Capon） beamformer degraded when suppressing the interferences that are coherent with the signal of interest（ SOI）. To tackle the problem,the spatial smoothing technique is adopted in quaternion domain to decorrelate the interferences by using linearly and uniformly spaced two-component electromagnetic vector-sensors. By averaging several translational invariant subarray quaternion covariance matrices,the quaternion spatial smoothing is performed to prevent the SOI cancellation phenomena caused by the presence of coherent interferences. It is demonstrated that the quaternion spatial smoothing Q-Capon beamformer can suppress the coherent interferences remarkably while the computational cost is lower than the complex domain long vector spatial smoothing counterpart. Theoretical analyses and simulation results validate the efficacy of the spatially smoothed Q-Capon beamformer in terms of coherent interference suppression capability.展开更多
传统组播技术(PIM)需要依赖于事先创建的组播树来转发数据流,每个流均需维护组播树和流状态,这使得网络节点的组播表、组播状态等的增长,成为组播网络中最复杂、不可控的部分。因此新的组播技术方案BIER(Bit Index Explicit Replicatio...传统组播技术(PIM)需要依赖于事先创建的组播树来转发数据流,每个流均需维护组播树和流状态,这使得网络节点的组播表、组播状态等的增长,成为组播网络中最复杂、不可控的部分。因此新的组播技术方案BIER(Bit Index Explicit Replication),即基于比特位的显式复制技术被提出并得到飞速的发展。依赖BIER作为核心域,承接PIM路由器的组播流,并建立隧道发送到相应的PIM路由器。IETF工作组发布一系列的草案来规定PIM信令穿越BIER的方法。经过对IETF已发布的这些草案的研究,提出PIM-SM和PIM-DM数据流穿越BIER域的补充方法。展开更多
基金Supported by the National Natural Science Foundation of China(61331019)
文摘The performance the quaternion-Capon（ Q-Capon） beamformer degraded when suppressing the interferences that are coherent with the signal of interest（ SOI）. To tackle the problem,the spatial smoothing technique is adopted in quaternion domain to decorrelate the interferences by using linearly and uniformly spaced two-component electromagnetic vector-sensors. By averaging several translational invariant subarray quaternion covariance matrices,the quaternion spatial smoothing is performed to prevent the SOI cancellation phenomena caused by the presence of coherent interferences. It is demonstrated that the quaternion spatial smoothing Q-Capon beamformer can suppress the coherent interferences remarkably while the computational cost is lower than the complex domain long vector spatial smoothing counterpart. Theoretical analyses and simulation results validate the efficacy of the spatially smoothed Q-Capon beamformer in terms of coherent interference suppression capability.
文摘传统组播技术(PIM)需要依赖于事先创建的组播树来转发数据流,每个流均需维护组播树和流状态,这使得网络节点的组播表、组播状态等的增长,成为组播网络中最复杂、不可控的部分。因此新的组播技术方案BIER(Bit Index Explicit Replication),即基于比特位的显式复制技术被提出并得到飞速的发展。依赖BIER作为核心域,承接PIM路由器的组播流,并建立隧道发送到相应的PIM路由器。IETF工作组发布一系列的草案来规定PIM信令穿越BIER的方法。经过对IETF已发布的这些草案的研究,提出PIM-SM和PIM-DM数据流穿越BIER域的补充方法。
