基于树小波压缩与最大似然的超宽带信道融合估计方法  

UWB channel fusion estimation based on tree wavelet compression and maximum likelihood method

作　　者：王洪武 杨腾 张继伟 张文锋 沈锋 WANG Hongwu;YANG Teng;ZHANG Jiwei;ZHANG Wenfeng;SHEN Feng(Transmission Branch of Yunnan Power Grid Company Limited,Kunming 650033,China;School of Instrument Science and Engineering,Harbin Institute of Technology,Harbin 150006,China)

机构地区：[1]云南电网有限责任公司输电分公司,云南昆明650033 [2]哈尔滨工业大学仪器科学与工程学院,黑龙江哈尔滨150006

出　　处：《辽宁工程技术大学学报（自然科学版）》2024年第3期373-378,共6页Journal of Liaoning Technical University (Natural Science)

基　　金：国家自然科学基金项目(61673128,61573117)。

摘　　要：为实现无人集群智能化巡检,针对脉冲超宽带技术在山区、森林等复杂地区的应用劣势,提出应对复杂环境下多径效应影响的信道估计方法。通过理论分析与实验研究,提出一种基于树小波压缩与最大似然法融合的信道估计方法(TS-SC)。该方法在贝叶斯压缩感知(CS)模型基础上,通过小波基的稀疏矩阵与马尔可夫链蒙特卡洛抽样,建立层次贝叶斯模型,以实现低速采样下原始信号的恢复。采用最大似然估计方法(SC)对多径数量和增益进行准确估计。实验结果表明:噪声SNR为10dB时,借助低频采样数据,检测精度能达到0.5592,满足复杂环境中信道估计的需求。研究成果突破了传统信道估计方法的局限,为复杂环境下的无人机集群通信提供了有效解决方案。In order to realize unmanned cluster intelligent inspection,a channel estimation method is proposed to deal with the multipath effect in complex environment,aiming at the disadvantages of pulse UWB technology in complex areas such as mountain and forest.Through theoretical analysis and experimental research,a channel estimation method(TS-SC)based on the fusion of tree wavelet compression and maximum likelihood method is proposed.Based on the Bayesian compressed sensing(CS)model,the hierarchical Bayesian model is established through sparse matrix of wavelet base and Markov chain Monte Carlo sampling to realize the recovery of the original signal under low-speed sampling.Then,the maximum likelihood estimation method(SC)is used to accurately estimate the number and gain of multipath.The experimental results show that under the condition of noise SNR is 10 dB,the detection accuracy can reach 0.5592 with the help of low frequency sampling data,which meets the requirement of channel estimation in complex environment.The research results break through the limitations of traditional channel estimation methods and provide an effective solution for UAV cluster communication in complex environments.

关 键 词：压缩感知 最大似然法 超宽带 信道估计 多径效应 

分 类 号：TN925[电子电信—通信与信息系统]