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

Table 2

All the controllable factors (factors of interest) and their measurement details.

Controllable factor	Measurement detail	Measurement notation
APs density	Number of APs in the test area	APN
APs distribution	Distance of APs’ centroid to indoor field centroid, and the coefficient of variation of distances from all APs to the centroid	CD and CV
Attenuation factor	Attenuation factor in simulation radio signal propagating model
Signal noise	Signal noise standard deviation in simulation radio signal propagating model
RPs density	Grid interval distance of RPs when sampling RSSI fingerprint	GID