Aerospace and Electronic Systems Magazine May 2018 - 16

WiFi-Based Through-the-Wall Presence Detection

Figure 1.

Experimental setup.

Figures 2 and 3 show the mean Doppler spectrum computed
Our recognition method is based on the analysis of the
over the three different classes, for Setup 1 and Setup 2, respecmean Doppler spectrum that is computed as follows. Consider
tively. As expected, in case of the presence of a person, either
the time-varying channel transfer function H(m, l) = Hm(l) that
in a static or dynamic condition, a larger spread with respect to
represents the magnitude of the global CSI at time m for each
empty room is observed. Moreover, Figures 2 and 3 show that
subcarrier l. Then, the output Doppler spread function G(k, l),
or bifrequency function, is found by
computing the discrete Fourier transform (DFT) of H(m, l), with respect
to the time variable m [14]. The DFT
is computed over a sliding time window of W = 10 s, which means that for
every new received CSI vector, a new
G(k, l) is calculated. The size of W has
been chosen as a trade-off between the
accuracy in the classification task and
the recognition delay, i.e., the time
interval after which a new estimation
of the human presence is completely
updated. Note that the output Doppler spread function G(k, l) represents
the Doppler spectrum associated with
each subcarrier l. Finally, we obtain
the mean Doppler spectrum D(k) by
Figure 2.
Magnitude of average Doppler spectrum for empty room, presence (static), and presence (dynamic)
taking the average of G(k, l) over the
scenarios obtained in Setup 1.
subcarrier index l.
16

IEEE A&E SYSTEMS MAGAZINE

MAY - JUNE 2018



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