OFDM frequency domain error estimation and positioning precision evaluation method for indoor Wi-Fi positioning

• Main Authors: ZHOU MU, NIE WEI, TIAN ZENGSHAN, HE WEI, XIE LIANGBO, ZHANG ZHENYA
• Format: Patent
• Language: Chinese; English
• Published: 18.02.2020
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION; WIRELESS COMMUNICATIONS NETWORKS

The invention discloses an OFDM frequency domain error estimation and positioning precision evaluation method for indoor Wi-Fi positioning. The method comprises the following steps: firstly, proposingthe expression of an antenna receiving signal with a frequency domain error caused by carrier frequency offset (CFO); analyzing from the perspective of a frequency domain and processing unknown parameter vectors to obtain parameters to be estimated, and calculating an FIM of a parameter to be estimated to derive an estimation error closed expression of the CFO; meanwhile, establishing a relationship among the signal amplitude, the time delay and the coordinate of the to-be-estimated target; deducing a closed expression of an indoor Wi-Fi positioning error boundary based on channel state information (CSI) under a CFO (Computational Fluid Object); finally, analyzing the influence of different factors on the indoor Wi-Fi positioning precision based on the CSI under the CFO. In addition, according to the method, the