Abstract

Symmetrical antenna array is useful for omni bearing beamforming adjustment with multiple receivers. Beam-forming techniques using evolution algorithms have been studied for multi-user resource allocation in simultaneous wireless information and power transfer (SWIPT) systems. In a high-capacity broadband communication system there are many users with wearable devices. A transmitter provides simultaneous wireless information and power to a particular receiver, and the other receivers harvest energy from the radio frequency while being idle. In addition, the ray bounce tracking method is used to estimate the multi-path channel, and the Fourier method is used to perform the time domain conversion. A simple method for reducing the frequency selective effort of the multiple channels using the feed line length instead of the digital phase shifts is proposed. The feed line length and excitation current of the transmitting antennas are adjusted to maximize the energy harvest efficiency under the bit error rate (BER) constraint. We use the time-domain multipath signal to calculate the BER, which includes the inter symbol interference for the wideband system. In addition, we use multi-objective function for optimization. To the best of our knowledge, resource allocation algorithms for this problem have not been reported in the literature. The optimal radiation patterns are synthesized by the asynchronous particle swarm optimization (APSO) and self-adaptive dynamic differential evolution (SADDE) algorithms. Both APSO and SADDE can form good patterns for the receiver for energy harvesting. However, APSO has a faster convergence speed than SADDE.

Highlights

  • Simultaneous wireless information and power transfer (SWIPT) has been widely investigated recently [1,2,3,4,5,6,7,8,9,10,11,12]

  • For wide-band signals, the weighting vector is assumed to be adjusted according to the different frequencies, and bit error rate (BER) should consider the inter symbol interference

  • We set the frequency range from 4 GHz to 5 GHz with a spacing of ∆ f = 20 MHz for the simulation in this study, using the regulations of the ultra-wideband indoor communication system developed by the Federal Communications Commission (FCC), R = 0.125 m, which corresponds to the adjacent distance between the antennas for the half wavelength of 4 GHz

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Summary

Introduction

Simultaneous wireless information and power transfer (SWIPT) has been widely investigated recently [1,2,3,4,5,6,7,8,9,10,11,12]. In SWIPT systems, signals with information are used for communication and for energy extraction. The authors of [2] used a frequency-selective channel with additive Gaussian noise Another piece of research proposed a dynamic power splitting receiver to spilt the signal and decoded information, with a variable ratio of power to harvest energy [3]. The beamforming technique transmitted to the energy and the information receiver of the narrow band signal. In the work of [7], the analytic solution was used to optimize the beamforming technology of the SWIPT system. Most papers deal with the optimal analytic solution with the signal-to-noise ratio constraint for narrow-band signals. For wide-band signals, the weighting vector is assumed to be adjusted according to the different frequencies, and BER should consider the inter symbol interference.

System Description
Transmitter Architecture Design
Impulse Response
Receiver Architecture Design
QualityThe of Service
Optimization Problem Formulations
Evolution Algorithms
Self-Adaptive Dynamic Differential Evolution
Environment Settings
Radiation pattern
Conclusions
Full Text
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