Two-hop cognitive DF relaying with wireless power transfer in time and power domains

In this paper, we consider a wireless powered cognitive relaying system with a secondary relay (SR) capable of harvesting wireless energy. Along with an access point (AP) continuously transmitting the primary data to a primary user (PU), a secondary source (SS) can transmit the secondary data to a s...

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Bibliographic Details
Published in:EURASIP journal on wireless communications and networking 2021-10, Vol.2021 (1), p.1-22, Article 182
Main Authors: Zheng, Lina, Zhai, Chao
Format: Article
Language:English
Subjects:
Cognitive relaying
Communication
Communications Engineering
Constraints
Data transmission
Decode-and-forward
Energy
Energy harvesting
Engineering
Information Systems Applications (incl.Internet)
Interference
Internet of Things
Networks
Outage probability
Outages
Probability
Radio networks
Receivers & amplifiers
Relaying
Signal,Image and Speech Processing
Spectrum sharing
Splitting
System effectiveness
Wireless networks
Wireless power transfer
Wireless power transmission
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Summary:In this paper, we consider a wireless powered cognitive relaying system with a secondary relay (SR) capable of harvesting wireless energy. Along with an access point (AP) continuously transmitting the primary data to a primary user (PU), a secondary source (SS) can transmit the secondary data to a secondary destination (SD) with the help of SR using the decode-and-forward (DF) protocol. SR can harvest energy from both SS and AP in both time and power domains using time-splitting and power-splitting techniques. The interference from primary data transmissions can help boost the amount of harvested energy at SR. The transmit power of SS is regulated by the interference threshold at PU and the allowable peak power. Despite the above two constraints, the transmit power of SR is further constrained by the amount of harvested energy. Once SR successfully decodes the data from SS, it will forward the data to SD using a constrained power. We analyze the approximate outage probabilities for both primary and secondary systems. Simulation results are provided to verify the effectiveness of our theoretical analysis and reveal the impacts of various parameters to the outage performance.
ISSN:1687-1499
1687-1472
1687-1499
DOI:10.1186/s13638-021-02058-3