In this letter, we study efficient channel estimation for an intelligent reflecting surface (IRS)-assisted orthogonal frequency division multiplexing (OFDM) system to achieve minimum training time. First, a fast scheme with reduced OFDM symbol duration is proposed arbitrary frequency-selective fading channels. Next, under the typical condition that IRS-user line-of-sight (LoS) dominant, another...

Absolute orientation estimation is one of the key steps in computer vision, and n 2D–3D point correspondences can be used to obtain absolute orientation, which known as perspective-n-point problem (PnP). The lowest number three if there no other information, corresponding algorithm called P3P solver. In practice, real scene may consist some geometric e.g., vanishing point. When scenes contain p...

Inertial navigation based on micro-electromechanical system (MEMS) inertial measurement units (IMUs) has attracted numerous researchers due to its high reliability and independence. The heading estimation, as one of the most important parts of inertial navigation, has been a research focus in this field. Heading estimation using magnetometers is perturbed by magnetic disturbances, such as indoo...