ENHANCING THE NETWORK LIFETIME OF COOPERATIVE WIRELESS SENSOR NETWORKS

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Abstract—Wireless Sensor Networks (WSN) consists of a
large number of miniature size, low-power, smart sensor nodes
interfacing with one another and deployed over a certain
inaccessible geographical locale having inadequate power and
storage space. Energy efficiency is a foremost concern in WSN.To
maximize the network lifetime, one possible solution is to harvest
energy from the ambient boundless accessible energy sources in
the environment nearby to the sensor nodes. The use of energy
harvesting (EH) nodes as cooperative relays is a promising and
budding solution in WSN. Energy harvest from one source is not
sufficient to congregate the power requirement of sensor nodes.
In this work, in order to improve the network lifetime
electromagnetic radiation energy harvesting (EMR EH) method
has been proposed. Communication is carried out by signal
cooperation through relays in order to assist the sources to
exchange their data for longer time periods. The current slot’s
transmission is based on transmitter knowledge about the
present channel signal to noise ratio (SNR), past harvested
energy and present energy stored in the battery. In order to solve
the low power problem while maximizing the lifetime of wireless
sensor nodes power management schemes like water filling
energy harvesting strategies is included. The network
performance metrics such as the probability of successful data
exchange and the network lifetime gain has been derived and
simulated using MATLAB. Simulations results illustrate that
proposed technique afford enhanced result compared to existing
energy harvesting schemes.

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