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RF – Energy Harvesting
By: Belal Essam
8 January 2017
Agenda• Conventional Powered Communication Networks.
• Naturally Powered Communication Networks (Energy Harvesting).
• Wireless Power Transfer, The Early Trials.
• Wireless Powered Communication Networks (RF-Energy Harvesting).
• Research directions in RF-Energy Harvesting.
• Wireless Powered Communication Networks Applications.
8 January 2017
Conventional Powered Communication Networks
• Need manual battery recharging/replacement.
• Inapplicable in some scenarios• Body sensors,
• sensors in dangerous environment (Volcanos, … etc.)
• Costly inefficient.
8 January 2017
Source: Rui Zhang “Wireless Powered Communication Networks: An Overview”, WCNC , April 2016.
Naturally Powered Communication Networks (Energy Harvesting)
• Energy source (renewable)• Sun, Wind, …, etc.
• Costly inefficient.
• Bulky (big size).
• Not on-demand (uncontrollable).
8 January 2017
Source: Rui Zhang “Wireless Powered Communication Networks: An Overview”, WCNC , April 2016.
Wireless Power Transfer, The Early Trials
• “Wardenclyffe Tower”, also known as (aka) the “Tesla Tower”.
• A Wireless transmission station designed and built by Nikola Tesla in New York in 1901.
• Tesla intended to transmit messages, telephony and even facsimile images across the Atlantic to England and to ships at sea.
• Intended for wireless power transfer at 150 KHz and 300 kW, un-succeeded and never put in practice.
• Additional investment could not be found and the project was abandoned in 1906 and never became operational.
8 January 2017
Wireless Powered Communication Networks (RF-Energy Harvesting)• Small size receivers.
• On-demand charging (controllable).
• Cost efficient.
• Low efficiency, but Still underdevelopment.
• Reported that 3.5mW and 1uW of wireless power can be harvested from RF signals at distances of 0.6 and 11 meters, respectively, using Powercast RF energy harvester operating at 915MHz.
8 January 2017
Source: Rui Zhang “Wireless Powered Communication Networks: An Overview”, WCNC , April 2016.
Research directions in RF-Energy Harvesting
• Prototyping receiver architecture.
• Wireless energy transfer source.
• Different network architectures.
• Optimal resource allocation (time, frequency, power, …, etc.)
• Information/Energy mode exchange.
8 January 2017
Wireless energy transfer source
• Moving vehicles.
• Dedicated power beacons.
• Hybrid Access Points.
8 January 2017
Source: Rui Zhang “Wireless Powered Communication Networks: An Overview”, WCNC , April 2016.
Source: E. Hossain, et al., "Wireless-powered cellular networks: key challenges and solution techniques," in IEEE Comm. Mag.June 2015.
Information/Energy mode exchange
• Time switching receiver.
• Power splitting receiver.
• Antenna switching receiver.
8 January 2017
Source: Rui Zhang “Wireless Powered Communication Networks: An Overview”, WCNC , April
2016.
Wireless Powered Communication Networks Applications• Wireless Powered Cognitive Radio Network.
• Conventional network: SU is silent during PU transmission.
• Wireless powered network: SU harvests energy during PU transmission.
8 January 2017
Source: Rui Zhang “Wireless Powered Communication Networks: An Overview”, WCNC , April 2016.
Wireless Powered Communication Networks Applications• Different receivers sensitivities enable the design of such a network.
• Information decoding Rx: -60 dBm.
• Energy harvesting Rx: -10 dBm.
8 January 2017
Source: Rui Zhang “Wireless Powered Communication Networks: An Overview”, WCNC , April 2016.
References• Rui Zhang “Wireless Powered Communication Networks: An Overview”, WCNC ,
April 2016.
• H. Tabassum, E. Hossain, A. Ogundipe and D. I. Kim, "Wireless-powered cellular networks: key challenges and solution techniques," in IEEE Communications Magazine, vol. 53, no. 6, pp. 63-71, June 2015.
• A. M. Zungeru, L. M. Ang, S. Prabaharan, and K. P. Seng, “Radio frequency energy harvesting and management for wireless sensor networks,” Green Mobile Devices and Netw.: Energy Opt. Scav. Tech., CRC Press, pp. 341-368, 2012.
8 January 2017
8 January 2017