Abstract
Ambient backscatter is a promising wireless communication technique where low-power users communicate with each other without any dedicated power source. These communicating users transmit their information by reflecting ambient radio-frequency (RF) signals. In this paper, we propose an ambient backscatter communications-assisted wireless-powered underlay cognitive radio network (CRN). The proposed CRN consists of a single primary transmitter (PT) and multiple primary receivers (PRs), secondary transmitters (STs), and secondary receivers (SRs). For efficient utilization of radio resources, the STs in the proposed scheme dynamically adopt either harvest-then-transmit mode or backscatter mode. Furthermore, PRs cooperate with STs to select an appropriate mode for their communication with SRs. To evaluate the performance of our proposed scheme, we conduct system-level simulations. Numerical results show that the performance of the secondary system can be improved in terms of throughput with minimum effect on the communication of primary users.
Highlights
For the realization of Internet of things (IoT), low-power wireless sensor networks (WSNs) have been adopted in numerous applications, such as health care, traffic control, surveillance, and so on
6 Conclusion In this paper, we proposed a new concept of integrating ambient backscatter communications with the cognitive radio network, where secondary transmitters (STs) are wirelessly powered by radio signals transmitted by the primary transmitter (PT)
Considering an underlay model for the secondary system, we proposed a scheme where STs choose between backscatter mode or harvestthen-transmit mode, based on the estimated interference that will be induced to primary receivers (PRs)
Summary
For the realization of Internet of things (IoT), low-power wireless sensor networks (WSNs) have been adopted in numerous applications, such as health care, traffic control, surveillance, and so on. Some of the major challenges faced in underlay CRSN are as follows: (a) how can a secondary user choose between backscatter mode or harvest-thentransmit mode; (b) while using harvest--transmit mode, how much time is used for harvesting energy and information transmission; and (c) how to estimate the interference at the PRs. In order to address the above mentioned issues, we use ambient backscatter-assisted wireless-powered network proposed by [10] in an underlay environment. We propose a transmission mode selection mechanism for secondary users, where STs can select either harvest--transmit mode or ambient backscatter mode based on the estimated interference at PRs. Authors in [26] have proposed a wireless powered communications network assisted by backscatter communications Their model consists of a power station, an information receiver and multiple users that can work in either backscatter mode or harvest-thentransmit mode.
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