Accurate Theoretical Models for Frequency Diverse Array Based Wireless Power Transmission

Abstract

Wireless power transfer (WPT) is a well-known problem, and has received wide attention in the next generation industrial applications and consumer electronics. On the other hand, frequency diverse array (FDA) is a new concept with the ability to generate a range-angle dependent beampattern. Therefore, some researchers are engaged in designing WPT systems based on the FDA framework (FDA-WPT) instead of phased arrays. Unlike phased arrays, the FDA beampattern is time-variant. Therefore, existing beam collection efficiency models based on the phased array are not suitable for the FDA-WPT system. More importantly, the time-variant property of FDAs is usually ignored in the literature, and the system configuration of the target area where the power-harvesting end is located does not conform to the actual WPT scenario. In this paper, we derive and present accurate models of the FDA-WPT system. The power transfer performance of the corrected FDA-WPT system is then compared with the phased array based WPT system. Simulation results demonstrate that time-variant consideration in the FDA-WPT model causes difficulty in controlling the main beam direction to focus the power. The accurate FDA-WPT is theoretically investigated, and numerical simulations are implemented to validate the theoretical analysis.

Differential STBC NOMA: A new approach to downlink cooperative NOMA

“…As we discussed above the main disadvantage of C-NOMA is the higher number of SICs at the receiver side, which causes an increased computational complexity of the overall system. Since there is limited power at each user equipment (UE), the high computational complexity causes the energy consumptions [20,21]. STBC-NOMA overcome the problems of cooperative NOMA, by using STBC cooperation.…”

“…But if the SIC is not perfectly designed, then it will allow some interferences in the desired signal at the receiver. Many things affect the performance of SIC eg, imperfect CSI, imperfect design, imperfect power allocation concerning phase and amplitude [20,23]. Due to imperfect SIC, the SINR at k -th and k -th+1 user will be…”

“…where γ th is the SIR threshold. In (20), A is the combination of the SIR of the k -th user (described as Q = X Y ) and the STBC gain after cooperation phase known as R , which can be described as…”

Design of Moiré-Inspired Metasurface Lens for Focusing Electromagnetic Power in Fresnel Near-Field Region

“…Over the past decade, beam-focusing technologies in the Fresnel near-field region have been dramatically developed for various applications such as biosensing, radio wave therapy, wireless power transmission (WPT), and RFID [1][2][3][4][5]. In general, to focus the electromagnetic power of the beam in the near-field region, a WPT system is designed by using numerous array antenna elements or a large aperture antenna.…”