Recent Advances in Wireless Indoor Localization Techniques and System

Table 2

WiFi strengths, weaknesses, and opportunities.

Strengths	(i) Found in almost every building, fairly good available signal strengths.; (ii) WiFi signals are able to penetrate walls in where GPS fails.; (iii) Targeted location fingerprints available.
Weaknesses	(i) Site surveying time consuming and labor intensive.; (ii) Multipath influenced by presence of Physical objects.; (iii) Signal strength changes in variations due to time.; (iv) Interfere possible with other appliances in the 2.4 GHz ISM.
Opportunities	(i) Fingerprinting does not need geometric surveys.; (ii) Fingerprinting only necessary at selected places.