An Analysis of Impact Factors for Positioning Performance in WLAN Fingerprinting Systems Using Ishikawa Diagrams and a Simulation Platform

Table 1

Empirical coefficient values for indoor propagation in various types of buildings.

Building type
Vacuum, infinite space	2.0	0
Retail store	2.2	8.7
Grocery store	1.8	5.2
At same floor	2.8	12.9
Through three floors	5.2	6.7
Office	2.7	8.1
Office	3.2	11.2
Office	3.2	4.4
Office	3.5	12.8
Office	4.0	4.3
Factory	2.1	9.7
Factory	3.3	6.8