Abstract
Simultaneous wireless information and power transfer (SWIPT) optimization with multiple objective function optimization is presented in the millimeter band in this paper. Three different objective functions that are used for harvest power (HP), capacity, and bit error rate (BER) were studied. There are three different nodes in real environment for wireless power transfer (WPT) and SWIPT. The channel estimation calculated by shooting and bouncing ray/image techniques includes multi-path, fading effect, and path-loss in the real environment. We applied beamforming techniques at the transmitter to focus the transmitter energy in order to reduce the multi-path effect and adjust the length of the feed line on each array element in order to find the extremum of the objective functions by the self-adaptive dynamic differential evolution (SADDE) method. Numerical results showed that SWIPT node cannot achieve good performance by single objective function, but wireless power transfer (WPT) can. Nevertheless, both WPT and SWIPT nodes can meet the criteria by the multiple objective function. The harvesting power ratio as well as the BER and capacity can be improved by the multiple objective function to an acceptable level by only reducing a little harvesting energy compared to the best harvesting energy for the single objective function. Finally, the multiple optimization function cannot merely provide good information quality for SWIPT node but achieve good total harvesting power for WPT and SWIPT node as well.
Highlights
We can recognize two practical architectures of wireless power transfer (WPT) in communication systems: wireless powered communication networks (WPCNs) [1,2,3,4,5,6,7] and simultaneous wireless information and power transfer (SWIPT) [8,9,10,11,12,13,14,15,16]
Sources and tasks scheduling for the Simultaneous wireless information and power transfer (SWIPT) Internet of Things (IoT) systems while focusing on reducing the power usage needed to guarantee the minimal ordinary information rate and task performance rate were presented by Lee and Lee [13]
For wide band signal transmission, the bit error rate performance should be considered in the wireless wideband communication system due to the frequency selective effect of the multipath channel and inter-symbol interference (ISI) instead of signal to noise ratio (SNR) only
Summary
We can recognize two practical architectures of wireless power transfer (WPT) in communication systems: wireless powered communication networks (WPCNs) [1,2,3,4,5,6,7] and simultaneous wireless information and power transfer (SWIPT) [8,9,10,11,12,13,14,15,16]. There has been a wide array of millimeter-wave communications that can be used to support a wide bandwidth for applications with high data transmission and massive power accesses. Sources and tasks scheduling for the SWIPT IoT systems while focusing on reducing the power usage needed to guarantee the minimal ordinary information rate and task performance rate were presented by Lee and Lee [13]. For wide band signal transmission, the bit error rate performance should be considered in the wireless wideband communication system due to the frequency selective effect of the multipath channel and inter-symbol interference (ISI) instead of SNR only. A wideband circular array is used to manufacture the array pattern in order to optimize the bit error rate (BER), capacity, and the energy harvesting efficiency by evolution algorithms.
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