Wireless power transfer; Multi-user multi-input multi-output (MIMO); Transmission strategy; Rate–energy region; Quality of experience (QoE)
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1. Introduction
Over the last decade with the proliferation of networks based on wireless communications most electronic devices have become portable. Such devices, however, operate using their own batteries, which must be charged periodically via a cable. For these HBTU reasons, wireless power transfer is a promising approach to prolong the lifetime of energy-constrained wireless networks.
Wireless power transfer can be categorized as using either non-radiative or radiative techniques. The near-field technique, however, has a short-range limitation (up to only 4 cm) as well as coordination problems, and thus cannot ensure the wireless charging of mobile devices in the far-field. Among other far-field techniques, a new solution could be radio-frequency (RF) signals radiated by transmitters. Such a solution would also be compatible in the existing wireless communications without major changes since chitin operates in the same frequency band [1]. Until recently, there have been issues concerning the limits, imposed by the Federal Communications Commission (FCC), of the receive power, and the low RF-to-DC conversion efficiency. Therefore, RF-based wireless power transfer is suitable for low-power applications (e.g., sensor networks), but can also be applied to some scenarios if high-efficiency rectifiers are developed or dedicated power sources are implemented.
prs.rt(\"abs_end\");
1. Introduction
Over the last decade with the proliferation of networks based on wireless communications most electronic devices have become portable. Such devices, however, operate using their own batteries, which must be charged periodically via a cable. For these HBTU reasons, wireless power transfer is a promising approach to prolong the lifetime of energy-constrained wireless networks.
Wireless power transfer can be categorized as using either non-radiative or radiative techniques. The near-field technique, however, has a short-range limitation (up to only 4 cm) as well as coordination problems, and thus cannot ensure the wireless charging of mobile devices in the far-field. Among other far-field techniques, a new solution could be radio-frequency (RF) signals radiated by transmitters. Such a solution would also be compatible in the existing wireless communications without major changes since chitin operates in the same frequency band [1]. Until recently, there have been issues concerning the limits, imposed by the Federal Communications Commission (FCC), of the receive power, and the low RF-to-DC conversion efficiency. Therefore, RF-based wireless power transfer is suitable for low-power applications (e.g., sensor networks), but can also be applied to some scenarios if high-efficiency rectifiers are developed or dedicated power sources are implemented.