Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental Study on Battery-less Sensor Network Activated by
  Multi-point Wireless Energy Transmission   This paper empirically validates battery-less sensor activation via wireless
energy transmission to release sensors from wires and batteries. To seamlessly
extend the coverage and activate sensor nodes distributed in any indoor
environment, we proposed multi-point wireless energy transmission with carrier
shift diversity. In this scheme, multiple transmitters are employed to
compensate path-loss attenuation and orthogonal frequencies are allocated to
the multiple transmitters to avoid the destructive interference that occurs
when the same frequency is used by all transmitters. In our previous works, the
effectiveness of the proposed scheme was validated theoretically and also
empirically by using just a spectrum analyzer to measure the received power. In
this paper, we develop low-energy battery-less sensor nodes whose consumed
power and required received power for activation are respectively 142 uW and
400 uW. In addition, we conduct indoor experiments in which the received power
and activation of battery-less sensor node are simultaneously observed by using
the developed battery-less sensor node and a spectrum analyzer. The results
show that the coverage of single-point and multi-point wireless energy
transmission without carrier shift diversity are, respectively, 84.4% and
83.7%, while the coverage of the proposed scheme is 100%. It can be concluded
that the effectiveness of the proposed scheme can be verified by our
experiments using real battery-less sensor nodes.

21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga