To addresses the implementation of indoor real-time
localization systems (RLTS), Saverio Pagano presents
a RSS-based tag based on WSNs with an anchor nodes clustering
strategy based on the Euclidean distances to reduce
the number of anchor nodes and to increase the beacon
node localization accuracy [23]. Yet, the influence of unfixed
distance between the beacon node and anchor nodes on localization
accuracy has not been thought out. Unlike the traditional
approaches, Chouchang Yang proposes a Wi-Fi based
positioning technique utilizing the transmission of multiple
predefined messages [24]. However, this work assumes that
each AP has four antennas and the user device is a smartphone
with a single antenna without considering the effects of the
number of each AP’s antennae on the localization