考虑输入噪声的混合调制拉格朗日明确时延估计改进算法（英文）

• 作 者: Wei XIA Ju-lei ZHU Wen-ying JIANG Ling-feng ZHU
• 机 构: School of Electronic Engineering, University of Electronic Science and Technology of China,Departmen
• 出 处: Frontiers of Information Technology & Electronic Engineering
• 发表日期: 2016年10期
• 关键词: 脉冲响应 时延估计 自适应滤波器 算法 噪声输入 调制拉格朗日法 拉格朗日 噪声 滤波器阶数 无偏

混合调制拉格朗日明确时延估计(mixed modulated Lagrange explicit time delay estimation,MMLETDE)算法可对窄带信号或正弦信号提供有效的时延估计。然而,该算法未考虑实际存在于输入端的加性观测噪声。针对该问题,本文利用已知噪声功率比,基于无偏脉冲响应估计技术,提出MMLETDE的一种改进算法。仿真结果表明,在中、高噪声场景下,该改进算法以小的滤波器阶数,实现了对窄带信号或较大频率范围内的正弦信号良好的时延估计。

The mixed modulated Lagrangian explicit time delay estimation (MMLETDE) algorithm can provide effective time-delay estimation for narrow-band or sinusoidal signals. However, the algorithm does not consider the additive observed noise that actually exists at the input. To solve this problem, this paper proposes an improved MMLETDE algorithm based on the known noise power ratio and unbiased impulse response estimation. The simulation results show that the proposed algorithm achieves a good estimation of the time delay of the narrow-band signal or the sinusoidal signal over a large frequency range with small filter order under medium and high noise scenarios.