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Ambient Backscatter Communications
Ambient Backscatter Communications
Ambient backscatter communication is perhaps the most energy- and spectrum-efficient technique. It is because there is no requirement of a dedicated carrier emitter in ambient backscatter configuration. The ambient backscatter devices operate using the carrier waves of the ambient RF sources like TV/ FM stations and Wi-Fi. This saves the energy consumed by a dedicated carrier emitter. Secondly, by exploiting the existing RF signals, the ambient backscatter configuration becomes spectral efficient as it does not require extra spectrum to operate. Moreover, the ambient backscatter configuration does not result in noticeable interference unless the devices are placed very close. Finally, the low cost and small form-factor of ambient backscatter devices favor its large-scale deployment in myriad scenarios.
Physical Layer Security
Physical Layer Security
Physical layer security (PLS) was pioneered by Shannon and further discussed by Wyner, and thereafter has been identified as an appealing strategy to cope with the ever-increasing secrecy demands from the information theoretic perspective. In the recent years, PLS has been investigated both as an alternative and as a complementary approach to conventional cryptographic methods. The PLS schemes exploit the random fading in wireless propagation channels to secure the communication link, while assuming no restrictions on the eavesdropper’s computational power.
Wireless Power Transfer
Wireless Power Transfer
Simultaneous wireless information and power transfer (SWIPT) have generated significant research interest from academia and industry. It can increase the lifetime of energy limited devices in the network. In fact, SWIPT improves the functionality of conventional wireless networks by concurrently transmitting power and information at the receiver. The source transfers power and information signal in a unicast (dedicated) or multicast scenario.
Vehicular Communications
Vehicular Communications
Vehicular communications is gradually becoming mature after decades of exciting developments and thriving advances. Resultantly, these advances have opened new possibilities for vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communications to meet the requirements of safety applications and future self-driving technologies. By enabling wireless communications among vehicles, many useful applications for vehicle safety and infotainment can be implemented. Data exchange in vehicular network utilizes either single hop communication or multi-hop communication. For single hop communication, a high transmit power signal is sent to reach the required propagation distance in a single hop.
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