Shin, Beomju Kim, Taehun Lee, Taikjin 2025-03-20T15:30:11Z 2025-03-20T15:30:11Z 2025-03-19 2025-02 https://pubs.kist.re.kr/handle/201004/151932 The most essential element of location based service is accurate user localization. Considering the existing indoor infrastructure of the internet of things and WiFi access points, along with the widespread use of smartphones by individuals, fingerprinting technology emerges as the most promising indoor navigation system in terms of costeffectiveness, performance, and accessibility. To estimate the user's location by fingerprinting, a fingerprinting radio map must be created in advance. The radio map contains received signal strength indicator (RSSI) vectors and its collection locations. In an indoor environment, RSSI values vary greatly depending on the collection direction, even if they are received from the same location. To compensate for this feature of RSSI, this paper proposes a new fingerprinting radio map that considers directionality. Since pedestrians can move in various directions indoors, all RSSI values collected along those directions are included in the radio map. In the location estimation step, the current location is estimated by comparing the spatial RSSI sequence of the current pedestrian with the reference points in different directions that have the highest correlation. To validate the proposed method, we analyzed the user location results using the existing radio map and the proposed radio map and found that the proposed radio map improved the positioning performance. English 한국통신학회 Towards accurate positioning: Directionality-enhanced fingerprinting radio map Article 10.1016/j.icte.2024.12.004 1 ICT Express, v.11, no.1, pp.149 - 156 ICT Express 11 1 149 156 Y scie scopus kci ART003173266 001428385700001 2-s2.0-85212405878 Computer Science, Information Systems Telecommunications Computer Science Telecommunications Article LOCALIZATION Indoor positioning Fingerprinting Radio map User directionality