A Tradeoff Strategy between Nonlinear Energy Harvesting and Information Transmission in SWIPT Network

In simultaneous wireless information and power transfer (SWIPT) network, SWIPT nodes usually implement nonlinear energy harvesting. This paper constructs a nonlinear energy harvesting model and proposes a SWIPT transmission scheme——intelligent cooperation of time switching and static power splitting (CoTP). Rate-energy (R-E) region of the scheme is derived, and the corresponding R-E tradeoff strategy of CoTP scheme with circuit power consumption at the receiver is investigated. In addition, R-E region performance comparisons between the proposed CoTP scheme, dynamic power splitting (DPS), on-off power splitting (OPS), static power splitting (SPS) and time switching strategy (TS) are presented. The effects of noise and circuit power consumption at the receiver are analyzed via simulation performance. Numerical results show that, compared with other schemes, the proposed CoTP scheme obtains higher achievable rates when the harvested energy per bit ranges from 0.6mJ to 2.4mJ without the consideration of circuit power consumption, while it obtains higher achievable rates when the harvested energy per bit ranges from 0mJ to 1.5mJ with the consideration of circuit power consumption, which can realize the tradeoff between energy harvesting and information transmission.