Discuss About The Wireless Communications Energy Harvesting?
Energy Harvesting is a process of deriving energy from external resources such as solar power, wind energy, kinetic energy and so on. High performance and energy efficient harvesting systems are being explored in order to overcome the limitation of energy associated with Wireless sensor networks (WSNs). The pervasive nature of wireless sensor network and its wide use in Internet of Things attracts a lot of attention. The successful implementation of various energy harvesting processes includes following a number of techniques such as RF, solar thermal and so on. combination wireless communication with sensing mainly regulates the growth of wireless sensor networks. Energy harvesting is necessary because, it is one of the primary problems faced by the WSNs. If the energy sensor node of WSN is depleted, it will not perform the its proper responsibility in network any longer, until and unless the source of the energy is replaced or some other energy harvesting process is incorporated in order to compensate for the void (Shaikh & Zeadally, 2016).
One of the most interesting concepts of energy harvesting is that, it allows the nodes of wireless devices to acquire energy continuously from mad made phenomenon or nature. One of the advantages of using energy harvest is that, it will ascertain a promising future in the field wireless networks on basis of self- sustainability and virtually perpetual operations. The techniques used in energy harvesting are anticipated to incorporate different changes of transformation in wireless networking and would possibly help in reducing the use of conventional energy (Ulukus et al., 2015).
The energy source of wireless sensor nodes is generally a battery power. However, there are many problems associated with the batteries, which includes current leakages, battery break down and the limitation of the energy density of the batteries. Current leakage consumes electricity even if the battery is not in use. Therefore, the use of batteries as an energy source is of no use for wireless sensor nodes and applications that ranges from several months to years. Furthermore, in order to work uninterrupted, the sensor nodes requires an uninterrupted power supply, which the battery may not be able to supply and therefore, the need of energy harvesting is prominent in case of wireless sensor network.
The different energy harvesting techniques are as follows (Shaikh & Zeadally, 2016)-
1) Energy harvesting based on Radio Frequency - In this technique, the radio waves are converted into DC power and then harvested after conditioning.
2) Solar based energy harvesting- Solar energy is abundant in the environment, this can be used for impending the energy problems associated with Wireless sensor networks.
3) Thermal based Energy Harvesting- This process of harvesting deals with converting the heat energy into electrical energy by using Seebeck effect.
4) Flow based Energy Harvesting Technique- This techniques uses turbines and rotors for converting its rotational movement into electrical energy.
5) Wind based energy harvesting- In this technique, the wind energy is harvested to generate electricity.
6) Hydro based energy harvesting technique- in this technique, the energy of moving or falling water is used in order to harness energy.
Shaikh, F. K., & Zeadally, S. (2016). Energy harvesting in wireless sensor marketing: A comprehensive review. Renewable and Sustainable Energy Reviews, 55, 1041-1054.
Ulukus, S., Yener, A., Erkip, E., Simeone, O., Zorzi, M., Grover, P., business-law, K. (2015). Energy harvesting wireless communications: A review of recent advances. IEEE Journal on Selected Areas in Communications, 33(3), 360-381.