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Fast Near-field Computational Imaging with Deep Neural Networks

Fast Near-field Computational Imaging with Deep Neural Netwo...

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2021 CIE International Conference on Radar, Radar 2021

作者： Zhao, Fafa Wu, Zhenhua Pan, Xueli Yang, Lixia Ministry of Education Anhui University Key Laboratory of Intelligent Computing and Signal Processing Hefei China

ISBN: (纸本)9781665498142

With the capability to sculpt complex radiative wavefronts and couple energy from the reference wave to the desired radiation pattern, metasurface antennas have gained tremendous progress in recent years. The flexibility in antenna design gives rise to a bunch of metasurface antennas, while there is still a comprise between the needed operation band and radiation field pattern coherence. Furthermore, the relatively low sampling ratio and overlap between frequency measurement modes would inevitably pose a great challenge for matched filter and other advanced sparsity-driven post-processing imaging algorithms. In this paper, we design a deep neural network to achieve fast scene image reconstruction. The trained network could fastly reconstruct the imaged object in both low scene compressed ratio and high coherence of the measurement modes. The imaging experiments with measured radiation field data are conducted to verify the effectiveness of our method. © 2021 IEEE.

关键词： computational imaging deep neural network metasurface antennas

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Numerical simulation of infrared photodetectors with Au gratings by FDFD method 6

Numerical simulation of infrared photodetectors with Au grat...

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6th IEEE International Symposium on Microwave, Antenna, Propagation, and EMC Technologies, MAPE 2015

作者： Lulu, Cheng Huang, Zhixiang Xu, Jie Wu, Xianliang Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei China

ISBN: (纸本)9781467374415

Quantum-well infrared photodetectors have been studied extensively due to their night vision, astronomy and environmental monitoring research in recent years. However, responsivity and detectivity are relatively low in these photodetectors without the Au gratings. Therefore, the Au grating will be employed on the surface of photodetector with periodic structure due to the principle of spoof plasmon resonance. The new design mainly aims to enhance the absorption in the QW active region based on the Au grating and can be numerically simulated by using finite-difference frequency-domain method. With optimal grating parameters, the absorption can be enhanced by hundreds of times compared with that in the reference structure without grating. The theoretical results provide the realistic organic infrared photodetectors with theoretical basis and technical support. © 2015 IEEE.

关键词： Numerical methods

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A Low-Complexity and High-Efficient Pilot Allocation Scheme Based on User Grouping in Massive MIMO System 19

A Low-Complexity and High-Efficient Pilot Allocation Scheme ...

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19th IEEE International Conference on Communication Technology, ICCT 2019

作者： Zhao, Xinying Yao, Yijing Xu, Lei Fang, Hongyu Zhang, Hongwei Li, Xiaohui Anhui University Key Laboratory of Intelligent Computing and Signal Processing of Ministry of Education Hefei China

ISBN: (纸本)9781728105352

Pilot allocation is one of the effective means to reduce pilot pollution in massive Multiple-Input Multiple-Output (MIMO) systems. The goal of this paper is to improve the uplink achievable sum rates of strong users, and ensure the quality of service (QoS) requirements of weak users at the same time, so that the sum rates of system can be improved. Combining with the technical advantage of pilot grouping, a low complexity pilot allocation scheme based on matching algorithm is proposed, which divides the users in the target cell into weak user group and strong user group, and adopts the minimum-maximum matching method to allocate pilots in weak user group. Through the introduction of Hungarian algorithm, a pilot allocation method is designed to ensure the fairness of the strong users. The simulation results show that, compared with the smart pilot allocation scheme, the pilot allocation scheme based on Hungarian algorithm, the pilot allocation scheme based on user grouping and the random pilot allocation scheme, the system performance of the proposed scheme has been effectively improved. © 2019 IEEE.

关键词： Quality of service

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Delay estimation in DS-CDMA communication using conjugate descent algorithm

Delay estimation in DS-CDMA communication using conjugate de...

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2008 International Conference on Wireless Communications, Networking and Mobile computing, WiCOM 2008

作者： Xiaohui, Li Wei, Gao Hongwei, Zhang Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei China

ISBN: (纸本)9781424421084

in this paper, we propose a method for DS-CDMA delay estimation through the use of the downlink channel character. This method is based on Independent Component Analysis using the conjugate descent algorithm to estimate the multi-path mixture matrix and find the delay information which is embodied by the column vector of the mixture matrix using both the independence of information source and the known spread spectrum code. The simulation results show that it has better estimated effect and enhance the performance of traditional detector comparing with MMSE and Fast-ICA algorithm. © 2008 IEEE.

关键词： Code division multiple access

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Uniplanar coupled-feed printed PIFA for LTE/WWAN operation in the laptop computer

Uniplanar coupled-feed printed PIFA for LTE/WWAN operation i...

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2013 International Conference on Communication Technology, ICCT 2013

作者： Zhang, Sai Li, Minquan Rong, Bo Chang, Haixing Peng, Meng Ding, You Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei China

ISBN: (纸本)9781845648633

A new uniplanar printed PIFA with a coupled-feed structure for LTE/WWAN operation is proposed. The PIFA consists of a coupled-feed loop structure and two separated radiators which are able to generate additional bands for the operation. The loop antenna path and the longer radiator can produce a dualresonance generating the required lower band exactly, while three wide bands contributed by the loop path, the loop path with the longer radiator and the loop path with the shorter radiator can form an operating band to cover the (1710-2690 MHz) band. Because of the small size of only 14×70 mm2, the antenna which can cover the required eight bands is therefore very suitable for the modern Ultra-thin laptops. © 2014 WIT Press.

关键词： Radiators

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Electromagnetic scattering of two-dimensional rough cylinder based on statistical integral equation 2

Electromagnetic scattering of two-dimensional rough cylinder...

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2020 2nd International Conference on Artificial Intelligence Technologies and Application, ICAITA 2020

作者： Zhu, Mengnan Wang, Anqi Huang, Zhixiang Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei China

The study of electromagnetic scattering from Gaussian rough surface is of great significance in radar reconnaissance, target tracking and ocean remote sensing. The moment method (MOM) is a commonly used method with high accuracy. However, in the past research, Monte Carlo method is used to simulate the Gaussian rough surface. In this method, a large number of random simulation operations are carried out, and then a statistical convergence result is obtained by counting the results of all operations. In this paper, the stochastic integral equation method SIEM(Stochastic Integral Equation Method) is proposed to calculate the electromagnetic scattering of Gaussian rough surface. SIEM avoids the difficulty of high difficulty precise modeling and repeated calculation many times, and only single modeling and calculation are carried out for the target problem. In this paper, the electromagnetic scattering of two-dimensional cylinder with Gaussian rough surface is solved, and the effectiveness of SIEM is proved by comparing with mom. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Method of moments

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Classification of four-class motor imagery EEG data using spatial filtering

Classification of four-class motor imagery EEG data using sp...

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2nd International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2008

作者： Wang, Lu Wu, Xiao-Pei Key Laboratory of Intelligent Computing and Signal Processing of Ministry of Education Anhui Univesity Hefei China

ISBN: (纸本)9781424417483

An efficient discrimination method of different brain states is important in order to implement a suitable system. This paper applies the One Versus the Rest CSP to the EEG data recorded during motor imagery tasks consisting of four different classes, namely the imagination of right hand, left hand, foot and tongue movements. The best correct classification results for the three subjects are73.3%, 81.7%, and 76.7%. © 2008 IEEE.

关键词： Brain computer interface

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Analysis of Asymptotically Tight Approximation ser for Cooperative NOMA Systems 19

Analysis of Asymptotically Tight Approximation ser for Coope...

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19th IEEE International Conference on Communication Technology, ICCT 2019

作者： Zhu, DIngcheng Yao, Yijing Xu, Lei Zhang, Hongwei Fang, Hongyu Li, Xiaohui Anhui University Key Laboratory of Intelligent Computing and Signal Processing of Ministry of Education Hefei China

ISBN: (纸本)9781728105352

The closed-form formula derivation of the power domain cooperative Non-Orthogonal Multiple Access (NOMA) system is of great significance for further improving the performance of the system. However, the system performance formulas of the channel capacity and the paired bit error rate Pairwise Error Probability (PEP) are too complicated, which have increased the difficulty in system performance optimization. Therefore, based on the Amplify Forward (AF) relay cooperative NOMA model, the signal Interference Noise Ratio (SINR) formulas of the two weak-user nodes are constructed. Through the assumption of that, the Symbol Error Rate (SER) of each user is fair, the simplification condition of Moment Generating Function (MGF) with the harmonic mean form is satisfied. Combined with the SER calculation formula of MGF, the system SER asymptotically tight approximation formula with simple structure is derived at high signal-to-noise ratio (SNR). The Monte Carlo simulation results show that, the formula can accurately describe the SER performance of the power domain cooperative NOMA system with the non-ideal Successive Interference Cancellation (SIC) system when SNR is high. Under the condition of certain total power, the optimal power distribution factor is solved in order to minimize the total system SER. © 2019 IEEE.

关键词： Bit error rate

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The design and realization of a handheld terminal for industrial control purposes, based on rfid and embedded linux

The design and realization of a handheld terminal for indust...

引用

International Conference on Future Communication Technology and Engineering, FCTE 2014

作者： Zhang, T. Xu, Y.H. Ye, Z.Q. Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei China

ISBN: (纸本)9781138027770

Embedded systems and computational intelligence have been greatly developed in recent years. It is necessary to consider the design of a handheld terminal for industrial control purposes because there is still some work done by hand in the industrial process, and it is inconvenient and inefficient. In this paper, a design and achievement of a handheld terminal used in the industrial inspection process is proposed in order to make industrial control more efficient and safer. The handheld terminal hardware consists of ARM11 S3C6410 and RFID module together with a wireless transmission module. As for the software program, we use a QT platform in Fedora to design software programs including serial communication, RFID, and wireless transmission. We also design a useful Chinese input method. Finally, the test shows that the handheld terminal can work well in an industrial process and does have great application prospects. © 2015 Taylor & Francis Group, London.

关键词： Embedded systems

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A Novel FDTD Algorithm Based on the Vector and Scalar Potentials Equations 5

A Novel FDTD Algorithm Based on the Vector and Scalar Potent...

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5th IEEE International Conference on Computational Electromagnetics, ICCEM 2019

作者： Liu, Zhipeng Xie, Guoda Wu, Bo Ren, Xingang Fang, Ming Huang, Zhixiang Key Laboratory of Intelligent Computing Signal Processing Ministry of Education Anhui University Hefei China

ISBN: (纸本)9781538671115

As the advance in nanotechnology, the length of electronic devices down to nano-scale structure. It is important to consider multi-scale phenomena ruled by the Maxwell's equation in the finite-difference time-domain (FDTD) simulation. This paper provides an alternate approach for solving the vector and scalar potentials (A and Φ) formulation of Maxwell's equations instead of the fields (E and H) which might suffer from low frequency breakdown problem. This new approach is more suitable for multi-scale problem since it is stable in the long wavelength regime which established the proposed method as a better algorithm in the electromagnetic simulation. © 2019 IEEE.

关键词： Maxwell equations

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