Implementation of cooperative virtual MISO communication in underwater acoustic wireless sensor networks
In this paper, for the first time, virtual antennas are used in an
underwater acoustic wireless sensor network and their effects on
total system performance are studied. In multiple input single
output (MISO) channels, spacial diversity is used to improve the
system performance. In certain networks, especially in
underwater networks, nodes are too small to have more than one
antenna. Therefore, to achieve spacial diversity gain, cooperation
between adjacent nodes can be a proper alternate method. For
this purpose, each node of network tries to use its nearest
adjacent node as a virtual antenna at some portions of time and
with the aid of space time coding this new antenna profits from
spacial diversity. It means that a cooperative virtual MISO
scenario must be devised to determine the transmission and
cooperation method in the network. Thus, the most frequently
used cooperation schemes "decode and forward," and "amplify
and forward," are applied, simulated and studied in an arbitrary
underwater acoustic wireless sensor network and compared with
the noncooperation mode. In this paper the alamouti space time
coding, and the maximum ratio combiner are used to transmit,
and combine data, respectively. Simulations show that virtual
antenna in underwater wireless sensor networks can improve
system performance up to 12.08%.
Keywords: Cooperative transmission, Underwater acoustic wireless sensor network, spacial diversity, Virtual MISO, Virtual antenna
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