IEEE Signal Processing - May 2018 - 70

Threshold
TRRS (B, C)

1) Physical
Locations
(Coordinates)

0

2) Indoor Events
Space

TRRS (B, B)
1

TRRS

g

h

3) . . .
A′

A

C′

C
B′

B
CSI Logical Space

TRRS (B, C)

TR Space

FIGURE 13. An illustration of mapping between the CSI logical space and the TR space.

Origin Wireless Center

119″

186″
Office
1070-8

183″

D7

294″

133″

145″

Office
1070-10

187″

203″

Rx Tx

134″
453″

D8

128″

Office
1070-7

117″

Office
1070-6

162″

Office
1070-5
171″

D6

Open Area
250″

Open Area
1070-13

D4

83″

D5
C

136″

D2
113″

262″

141″

68″

D3

1
D1

Elevator Lobby
EWC

Work Room
1070-2

192″

B

147″

247″

(a)

(b)

(c)

FIGURE 14. The experimental setting. (a) The floor plan, (b) the radio station: receiver, and (c) the radio station: transmitter [62].

TRS i (H T, test) = max

max TR (h T, test, h T, i),

h T,test ! H T,test h T,i ! H T,i

(12)

where H T, test denotes a group of testing CSI samples assumed
to be drawn from the same state at M different time instances,
i.e., H T, test = [h T, test (t 0), h T, test (t 1), f, h T, test (t M -1)].
Once we obtain the TRRS for each event, we can find the
u by searching for
most likely state for the testing CSI matrix H
u ), 6 i, as
the maximum among TRS i (H
S) = )

argmax TRS i (H T, test), if max TRS i (H T, test) $ C
Si ! D

unknown,

otherwise

Si ! D

, (13)

where the superscript * on S denotes the optimal. To avoid
false alarms introduced by events outside of the trained set D,
the TRIEDS adopts a threshold-trigger mechanism such that
the occurrence of event S * is reported if and only if the TRRS
TRS ) (H T, test) reaches a predefined threshold C.
70

Experiments
We evaluated the TRIEDS's performance through experiments
on detecting states of multiple door openings and closings in a
typical office environment during weekday working hours. We
also evaluated the received signal strength indicator (RSSI)based indoor detecting approach [10], which differentiates
different doors' open or closed state through RSSI change
patterns, and we compared it with the TRIEDS.
During the experiment, as shown in Figure 14(a), we placed
the radio frequency (RF) receiver on either location B or C,
and we set the transmitter on one of the 1-m-separated points,
designated axis 1, 2, 3, and 4, represented by the green dots
in the figure. In total, then, there were two receiver locations
and four transmitter locations, resulting in eight transmitter-receiver location possibilities. The TRIEDS's task was to
detect which wooden door among doors D1-D8, as marked
in Figure 14(a), was closed versus all of the other doors being

IEEE Signal Processing Magazine

|

May 2018

|



Table of Contents for the Digital Edition of IEEE Signal Processing - May 2018

Contents
IEEE Signal Processing - May 2018 - Cover1
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IEEE Signal Processing - May 2018 - Contents
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IEEE Signal Processing - May 2018 - Cover3
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