论文标题
使用子空间拟合分析多径通道延迟估计
Analysis of multipath channel delay estimation using subspace fitting
论文作者
论文摘要
在室内和城市无线电传播方案中存在丰富的散射可能会导致多径成分（MPC）的高到达密度。 MPC通常到达接收器的集群，其中一个集群中的MPC具有相似的角度和延迟。到达单个群集内的MPC通常在延迟域中不受欢迎。在本文中，我们分析了未解决的MPC对延迟估计的偏差的影响，并用多台阶子空间拟合算法的偏差。我们将未解决的MPC视为导致扰动子空间估计的模型误差。从扰动的一阶近似开始，我们得出了视线（LOS）组件的延迟估计值的偏差。我们表明，与LOS分量相比，它取决于第一个群集中未解决的MPC的功率和相对延迟。包括数值实验，以表明偏差的派生表达很好地描述了未解决的MPC对延迟估计的影响。
The presence of rich scattering in indoor and urban radio propagation scenarios may cause a high arrival density of multipath components (MPCs). Often the MPCs arrive in clusters at the receiver, where MPCs within one cluster have similar angles and delays. The MPCs arriving within a single cluster are typically unresolvable in the delay domain. In this paper, we analyze the effects of unresolved MPCs on the bias of the delay estimation with a multiband subspace fitting algorithm. We treat the unresolved MPCs as a model error that results in perturbed subspace estimation. Starting from the first-order approximation of the perturbations, we derive the bias of the delay estimate of the line-of-sight (LOS) component. We show that it depends on the power and relative delay of the unresolved MPCs in the first cluster compared to the LOS component. Numerical experiments are included to show that the derived expression for the bias well describes the effects of unresolved MPCs on the delay estimation.
