Wireless Sensor Networks have been implemented in many indoor
applications such as offices, hospitals, laboratories for monitoring the
parameters such as temperature, humidity etc. Most of the applications have
used omnidirectional antennas. In randomly deployed ad hoc wireless sensor
networks, this may be useful to achieve coverage and connectivity
with unknown neighbors. In case of deterministic deployments such as in case of
food grain storages where locations of the sensor nodes are mostly fixed,
the main challenges are unstable and vacillating conditions in the godowns
during loading and unloading of sacs as well as unpredictable changes in
climate. Most of the commercial motes generally use omnidirectional
antennas. Energy overheads increase considerably with omnidirectional antennas.
Directivity increases energy saving but may be at the cost of redundancy. This
paper is mainly focused on the energy advantage in ad hoc wireless sensor
networks deployed in large food grain storages and energy overheads required
for obtaining certain level of redundancy using directional antennas.Finally, we
conclude that energy advantage can be achieved even if we overcome redundancy
to certain extent.
Cite this paper
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