基于改进TLS-ESPRIT的Chirp扩频系统信道估计  

Channel Estimation of Chirp Spread Spectrum System Based on Modified Forth-Order Cumulant TLS-ESPRIT Algorithm

作　　者：宋毅锋[1] 卓永宁[1] 

机构地区：[1]电子科技大学通信抗干扰技术国家级重点实验室,四川成都610054

出　　处：《通信技术》2010年第6期1-3,共3页Communications Technology

基　　金：国家自然科学基金(批准号:60872030)

摘　　要：提出了一种基于快速伪谱修正的四阶累积量TLS-ESPRIT算法。该算法充分运用了四阶累积量矩阵的数据信息,不但能较准确地估计Chirp扩频系统信道多径时延,而且可有效地识别和剔除虚径,进而建立在时延估计基础上的多径幅度估计就更可靠。针对关键参数在仿真设计和工程应用中的设置,列出了它们需要遵从的三个关系。最后以IEEE802.15.4a信道为传输环境,对该算法进行了仿真验证,并与四阶矩TLS-ESPRIT算法和伪谱搜索算法作了性能对比。A forth-order cumulant TLS-ESPRIT algorithm based on fast pseudospectral modification is proposed in this paper.This algorithm adequately uses data information of the forth-order cumulant matrix,could not only estimate the multipath time delay accurately,but also identify and eliminate the fake multipath effectively.Thus the estimation of multipath amplitude based on the estimation of multipath time delay becomes more reliable.For the setting-up of key parameters in simulation design and engineering application,this paper lists the three relations which these parameters should obey.Finally,both a simulation on the algorithm in the propagation circumstance of IEEE802.15.4a channel and a comparison with forth-order cumulant TLS-ESPRIT algorithm and pseudospectral search algorithm are done.

关 键 词：CHIRP信号 四阶累积量 TLS-ESPRIT算法 快速伪谱修正 

分 类 号：TN911[电子电信—通信与信息系统]