However, WPT and wireless information transfer (WIT) are often separated in a communication system.
By exploiting an efficient use of radio frequency (RF) signals for both wireless information transfer (WIT) and wireless power transfer (WPT) at the same time, SWIPT is a promising technology to provide cost-effective information and energy access to wireless devices in various applications in future.
Particularly in TSAC policy, each communication block time is slit into two slots, including wireless power transfer (WPT) slot and wireless information transfer (WIT) slot as mentioned in [4 7, 11, 12, 27, 31 33].
Especially, ambient radio signals have been regarded as a promising energy source for the energy harvesting, since the radio signals enable both wireless energy transfer (WET) and wireless information transfer (WIT).
With the energy assistance from SU, the UE will harvest more energy to support the wireless information transfer (WIT), thereby, the throughput of primary system gets larger with the increase of p a. Furthermore, even if adding up the p a, the throughput of primary system still becomes worse with the increase of d SU,UE.
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