scholarly journals Energy-Efficient Sub-Carrier and Power Allocation in Cloud-Based Cellular Network With Ambient RF Energy Harvesting

IEEE Access ◽  
2017 ◽  
Vol 5 ◽  
pp. 1340-1352 ◽  
Author(s):  
Yisheng Zhao ◽  
Victor C. M. Leung ◽  
Chunsheng Zhu ◽  
Hui Gao ◽  
Zhonghui Chen ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Power Allocation ◽  
Energy Efficient ◽  
Cellular Network ◽  
Rf Energy Harvesting ◽  
Rf Energy

scholarly journals Secrecy Performance Maximization for Underlay CR Networks with an Energy Harvesting Jammer

Sensors ◽  
2021 ◽  
Vol 21 (24) ◽  
pp. 8198
Author(s):  
Juan Sun ◽  
Shubin Zhang ◽  
Kaikai Chi
Keyword(s):  
Energy Harvesting ◽  
Power Allocation ◽  
Time Allocation ◽  
Information Transfer ◽  
Optimization Problems ◽  
Optimal Time ◽  
Secrecy Rate ◽  
Transmit Power ◽  
Rf Energy Harvesting ◽  
Rf Energy

This paper investigates the secrecy communication in an underlay cognitive radio (CR) networks with one primary user (PU) as well as multiple PUs, where the radio frequency (RF) energy-harvesting secondary user (SU) transmits the confidential information to the destination in the presence of a potential eavesdropper. We introduce a RF energy-harvesting secondary jammer (SJ) to secure the SU transmissions. The system works in time slots, where each time slot is divided into the energy transfer (ET) phase and the information transfer (IT) phase. In ET phase, the SU and SJ capture energy from the PU transmissions; in the IT phase, the SU uses the harvested energy to transmit information to the destination without causing the harmful interference to the PU transmissions, while the SJ utilizes the captured energy to generate jamming signals to the eavesdropper to secure the SU transmissions. We aim to maximize the secrecy rate for SU transmissionsby jointly optimizing the time allocation between ET phase and IT phase and the transmit power allocation at the SU and SJ. We first formulate the secrecy rate maximization as non-convex optimization problems. Then, we propose efficient nested form algorithms for the non-convex problems. In the outer layer, we obtain the optimal time allocation by the one dimension search method. In the inner layer, we obtain the optimal transmit power allocation by the DC programming, where the Lagrange duality method is employed to solve the convex approximation problem. Simulation results verify that the proposed schemes essentially improve the secrecy rate of the secondary network as compared to the benchmark schemes.

scholarly journals An Energy-Efficient UWB Transmitter with Wireless Injection Locking for RF Energy-Harvesting Sensors

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1426 ◽  
Author(s):  
Jun-Tae Kim ◽  
Bo-Ram Heo ◽  
Ickjin Kwon
Keyword(s):  
Energy Consumption ◽  
Energy Harvesting ◽  
Power Consumption ◽  
Energy Efficient ◽  
Rf Energy Harvesting ◽  
Locking Range ◽  
Current Consumption ◽  
Power Operation ◽  
Ultralow Power ◽  
Rf Energy

An ultralow-power ultrawideband (UWB) transmitter with an energy-efficient injection-locked radio frequency (RF) clock harvester that generates a carrier from an RF signal is proposed for RF energy-harvesting Internet-of-Things (IoT) sensor applications. The energy-efficient RF clock harvester based on the injection-locked ring oscillator (ILRO) is proposed to achieve optimal locking range and minimum input sensitivity to obtain an injection-locked 450 MHz clock in ultralow-power operation. A current-starved inverter-based delay stage is adopted that allows delay adjustment by bias voltage to minimize dynamic current consumption while maintaining a constant delay regardless of changes in process, supply voltage, and temperature (PVT). To minimize static current consumption, a UWB transmitter based on a digital-based UWB pulse generator and a pulse-driven switching drive amplifier is proposed. The proposed injection-locked RF clock harvester achieves the best RF input sensitivity of −34 dBm at a power consumption of 2.03 μW, enabling energy-efficient clock harvesting from low RF input power. In ultralow-power operation, a 23.8% locking range is achieved at the RF injection power of −15 dBm to cope with frequency changes due to PVT variations. The proposed UWB transmitter with RF clock harvester achieves the lowest energy consumption per pulse with an average power consumption of 97.03 μW and an energy consumption of 19.41 pJ/pulse, enabling operation with the energy available in RF energy-harvesting applications.

scholarly journals Dynamic power allocation and scheduling for MIMO RF energy harvesting wireless sensor platforms

2021 ◽  
Vol 19 (5) ◽  
pp. 1466
Author(s):  
Amar Esse ◽  
Khaizuran Abdullah ◽  
Mohamed Hadi Habaebi ◽  
Huda Adibah Mohd Ramli ◽  
Ani Liza Asnawi ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Power Allocation ◽  
Wireless Sensor ◽  
Rf Energy Harvesting ◽  
Dynamic Power ◽  
Sensor Platforms ◽  
Rf Energy

scholarly journals Energy efficient coordinated precoding design for a multicell system with RF energy harvesting

2015 ◽  
Vol 2015 (1) ◽  
Author(s):  
Shiwen He ◽  
Yongming Huang ◽  
Wenyang Chen ◽  
Shi Jin ◽  
Haiming Wang ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Energy Efficient ◽  
Rf Energy Harvesting ◽  
Rf Energy
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