Dielectric objects reconstruction by combining subspace-based algorithm and randomly global optimization algorithm

Chiu, Chien‐Ching; Yen, Chien-Yu; Lee, Gang-Ze

doi:10.1080/09205071.2017.1369905

Cited by 7 publications

(5 citation statements)

References 22 publications

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“…The position update equation of the shrinking encircling mechanism is shown in Equation (17). By decreasing 𝑎𝑎𝑎𝑎 ��⃑ from 2 to 0 and substituting its value into Equation ( 18), And when the pace coefficient 𝐴𝐴 ⃑ is in the range of [−1, 1], the search process of the whale algorithm enters the development stage.…”

Section: A Shrinking Encircling Mechanismmentioning

confidence: 99%

“…A vast amount of literature on the heuristic algorithm has been published recently [16][17][18][19][20][21][22][23][24][25][26][27][28][29]. The first was published in 1975, when Holland proposed the concept and theoretical basis of genetic evolution based on Darwin's concept of "natural selection", using the genetic mechanism of "survival of the fittest" to simulate the biological evolutionary process of genetic selection and natural elimination to find the best solution by a random search [16].…”

Section: Introductionmentioning

confidence: 99%

“…The first was published in 1975, when Holland proposed the concept and theoretical basis of genetic evolution based on Darwin's concept of "natural selection", using the genetic mechanism of "survival of the fittest" to simulate the biological evolutionary process of genetic selection and natural elimination to find the best solution by a random search [16]. In 2018, Chiu et al applied the self-adaptive dynamic differential evolution (SADDE) method to reconstruct two-dimensional dielectric objects and highlighted its robustness and searching speed [17]. The whale algorithm, which simulates the hunting behavior of humpback whales for optimal search, is a new bionic algorithm proposed by Mirjalili and Lewis in 2016 [19].…”

Section: Introductionmentioning

confidence: 99%

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Microwave Imaging for Half-Space Conductors Using the Whale Optimization Algorithm and the Spotted Hyena Optimizer

et al. 2023

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This research implements the whale optimization algorithm (WOA) and spotted hyena optimizer (SHO) in inverse scattering to regenerate the conductor shape concealed in the half-space. TM waves are irradiated from the other half-space to a perfect conductor with an unknown shape buried in one half-space. The scattered field measured outside the conductor surface with the boundary condition is used to reconstruct the object using the WOA and SHO algorithms. Several scenarios of reconstruction accuracy were compared for the WOA and SHO. The numerical simulations prove that the WOA has a better reconstruction capability.

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Section: A Shrinking Encircling Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microwave Imaging for Half-Space Conductors Using the Whale Optimization Algorithm and the Spotted Hyena Optimizer

et al. 2023

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“…If the new parametrical vector performs better than the optimal vector, then the new vector becomes the optimal vector, so the population in the dynamic differential algorithm is updated in a dynamic form. Please refer to the literature [22][23][24] for details.…”

Section: Self-adaptive Dynamic Differential Evolutionmentioning

confidence: 99%

Theoretical Derivation and Optimization Verification of BER for Indoor SWIPT Environments

et al. 2020

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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.

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“…The SADDE is based on the DDE scheme with the ability to automatically adjust the scaling factors without increasing the time complexity [23][24][25]. The SADDE algorithm starting from the initial population consists of a randomly generated set of individual coordinates that represent each location of the transmitter antenna.…”

Section: Self-adaptive Dynamic Differential Evolutionmentioning

confidence: 99%

Self-Adaptive Dynamic Differential Evolution Applied to Ber Reduction With Beamforming Techniques for Ultra Wideband Mu-Mimo Systems

Chiu¹,

Lai²,

Cheng³

2018

PIER C

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This paper introduces an Ultra-Wideband (UWB) circle antenna array with beam forming techniques that combine Self-Adaptive Dynamic Differential Evolution (SADDE) which is capable to minimize the Bit Error Rate (BER) for MultiUser Multiple Input Multiple Output (MU-MIMO) in indoor communication system. By using the ray tracing techniques to compute any given indoor wireless environment, the impulse response of the system can be calculated, and the BER can be computed accordingly. Next, we analyze the BER performance of the UWB MU-MIMO system that applies beam forming for spatial division multiple accesses. Numerical results show that the SADDE can control the antenna feed length to reduce the BER and form the radiation beam pattern towards the direction of the desired signals while forming nulls to co-channel interferers for MU-MIMO system.

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Dielectric objects reconstruction by combining subspace-based algorithm and randomly global optimization algorithm

Cited by 7 publications

References 22 publications

Microwave Imaging for Half-Space Conductors Using the Whale Optimization Algorithm and the Spotted Hyena Optimizer

Microwave Imaging for Half-Space Conductors Using the Whale Optimization Algorithm and the Spotted Hyena Optimizer

Theoretical Derivation and Optimization Verification of BER for Indoor SWIPT Environments

Self-Adaptive Dynamic Differential Evolution Applied to Ber Reduction With Beamforming Techniques for Ultra Wideband Mu-Mimo Systems

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