Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Through-Wall Tracking Using Variance-Based Radio Tomography Networks   This paper presents a new method for imaging, localizing, and tracking motion
behind walls in real-time. The method takes advantage of the motion-induced
variance of received signal strength measurements made in a wireless
peer-to-peer network. Using a multipath channel model, we show that the signal
strength on a wireless link is largely dependent on the power contained in
multipath components that travel through space containing moving objects. A
statistical model relating variance to spatial locations of movement is
presented and used as a framework for the estimation of a motion image. From
the motion image, the Kalman filter is applied to recursively track the
coordinates of a moving target. Experimental results for a 34-node through-wall
imaging and tracking system over a 780 square foot area are presented.

35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
3
The categories of this paper are: physics
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom