Journal
IEEE TRANSACTIONS ON COMMUNICATIONS
Volume 65, Issue 9, Pages 3659-3674Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCOMM.2017.2710338
Keywords
Cognitive radios; ambient backscatter; RF energy harvesting; convex optimization
Funding
- National Research Foundation of Korea - Korean Government (MSIP) [2014R1A5A1011478]
- Singapore MOE [RG33/16, RG18/13]
- US NSF [CNS-1702850, CNS-1646607, ECCS-1547201, CCF-1456921, CMMI-1434789, CNS-1443917, ECCS-1405121]
- MOE [MOE2014-T2-2-015 ARC4/15, MOE2013-T2-2-070 ARC16/14]
- National Research Foundation of Korea [2014R1A5A1011478] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This paper introduces a new solution to improve the performance for secondary systems in radio frequency (RF) powered cognitive radio networks (CRNs). In a conventional RF-powered CRN, the secondary system works based on the harvest-then-transmit protocol. That is, the secondary transmitter (ST) harvests energy from primary signals and then uses the harvested energy to transmit data to its secondary receiver (SR). However, with this protocol, the performance of the secondary system is much dependent on the amount of harvested energy as well as the primary channel activity, e.g., idle and busy periods. Recently, ambient backscatter communication has been introduced, which enables the ST to transmit data to the SR by backscattering ambient signals. Therefore, it is potential to be adopted in the RF-powered CRN. We investigate the performance of RF-powered CRNs with ambient backscatter communication over two scenarios, i.e., overlay and underlay CRNs. For each scenario, we formulate and solve the optimization problem to maximize the overall transmission rate of the secondary system. Numerical results show that by incorporating such two techniques, the performance of the secondary system can be improved significantly compared with the case when the ST performs either harvest-then-transmit or ambient backscatter technique.
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