公开(公告)号：US11259266B2

公开(公告)日：2022-02-22

申请号：US16729279

申请日：2019-12-27

Applicant: Industrial Technology Research Institute

Inventor： I-Ping Chang ,  Chia-Shing Huang ,  Hung-Yi Teng ,  I-Hsien Li

IPC: H04W64/00 ,  H04L1/00 ,  H04W52/24 ,  H04L27/26 ,  H04B17/318

Abstract: An estimation device is provided. The distance estimation device includes a calibration circuit and a distance estimation circuit. The calibration circuit may receive channel state information (CSI), and obtain signal-path power and noise-path power according to the CSI, and perform calculation to divide the signal-path power by the noise-path power to obtain a signal-power calibration value. The distance estimation circuit is coupled to the calibration circuit. The distance estimation circuit receives a received signal strength indication (RSSI) and the signal-power calibration value, and obtains a path-loss exponent according to the RSSI and the signal-power calibration value, and obtains a distance-estimation value according to the signal-power calibration value and the path-loss exponent.