  Ambient backscatter communications have been introduced as low-power
communications for green networking. This technology is very promising as it
recycles ambient radio frequency waves, however such systems have limitations
and suffer from poor performance due to their low-power. In this paper, we
present and evaluate the performance of an ambient backscatter system equipped
with a massive multiple input multiple output (MIMO) antenna at the reader
side. A mobile device transmits a signal that is backscattered by a tag and
received by the reader. Thanks to the spatial diversity of the massive MIMO
antenna, the reader is able to identify, for each received signal, the state of
the tag (backscattering or transparent) that corresponds to a bit of the tag
message. First, we experimentally determine the channel between the device and
the reader for two states of the tag. Then using a minimum mean square error
algorithm we evaluate the performance of the ambient backscatter communication.
We demonstrate that the performance of the ambient backscatter system is
significantly improved by the massive MIMO reader.
