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13th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2021

作者： Zhang, Fan Xu, Lili Zhang, Jianqiang Nan, Pulong Jin, Xiaofan Pan, Gaofeng Science and Technology on Communication Information Security Control Laboratory Zhejiang Jiaxing314033 China Huawei Technologies Co. Ltd Guangdong Shenzhen518063 China

ISBN: (纸本)9781665418126

A Ka-band quasi-elliptic bandpass filter (BPF) based on stereolithography apparatus (SLA) 3-D printing technique is proposed. The filter consists of four coupled resonators with three direct couplings between adjacent resonators and a cross coupling between the first and fourth resonators. Benefited from this feature, a pair of transmission zeros (TZs) can be produced in the stopband to enhance the passband selectivity significantly. Additionally, two waveguide bends are incorporated with the input and output waveguides to facilitate experimental test. For demonstration, a 3-D printed BPF prototype with center frequency of 30 GHz, bandwidth of 1.4 GHz, and return loss better than 20 dB is implemented and tested. The weight of the filter is 9.8 g only. The measured results demonstrate that the passband return loss is better than 10 dB, and the average in-band insertion loss is less than 2 dB. © 2021 IEEE.

关键词： Bandpass filters

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Modulation Recognition Based on Lightweight Residual Network via Hybrid Pruning 7

Modulation Recognition Based on Lightweight Residual Network...

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7th International Conference on Computer and communications, ICCC 2021

作者： Ji, Heng Xu, Wangyang Gan, Lu Xu, Zhengwu Science and Technology On Communication Information Security Control Laboratory Jiaxing314000 China University of Electronic Science and Technology of China Chengdu611731 China Yibin Institute of UESTC Yibin643000 China

ISBN: (纸本)9781665409506

Signal modulation recognition is an important and complicated problem in spectrum monitoring. In recent years, many advanced deep learning methods have been proposed for this problem. However, the high computational cost of deep neural networks largely hinders practical deployment. In this paper, we consider the signal modulation recognition problem via the deep residual network and propose a hybrid Pruning scheme to reduce the model size and memory cost. This is achieved by simultaneously enforcing channel-level and layer-level sparsity in residual network in a simple way. We take wide and large networks as input models, but during training, insignificant channels and layers are automatically identified and pruned afterwards, yielding compact and shallower networks with comparable accuracy. The results show that with 0 dB snr, the trainable parameters and multiply-accumulate operations are both reduced by 2/3. In summary, the proposed method can effectively reduce the parameters and complexity of recognition model. © 2021 IEEE.

关键词： Deep neural networks

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Modulation Recognition Based on Lightweight Residual Network via Binary Quantization 7

Modulation Recognition Based on Lightweight Residual Network...

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7th International Conference on Computer and communications, ICCC 2021

ISBN: (纸本)9781665409506

Signal modulation recognition is an important and complicated problem in spectrum monitoring. In recent years, many advanced deep learning methods have been proposed for this problem. However, the high computational cost of deep neural networks largely hinders practical deployment. In this paper, we consider the signal modulation recognition problem via the deep residual network and propose a binary quantization scheme to reduce the model size and memory cost. This is achieved by simultaneously increasing shortcuts and maintaining full-precision weights and outputs of key layers in binary residual network in a simple way. The results show that with competitive accuracy, 95% of multiply-accumulate operations of model are converted into binary operations under 0 dB snr. In summary, the proposed method can effectively reduce the parameters and complexity of recognition model. © 2021 IEEE.

关键词： Deep neural networks

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Individual communication Transmitter Identification Using Correntropy-based Collaborative Representation

Individual Communication Transmitter Identification Using Co...

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International Congress on Image and Signal Processing, BioMedical Engineering and Informatics

作者： Ying-Ke Lei Science and Technology on Communication Information Security Control Laboratory

ISBN: (纸本)9781509037117

In this paper, an efficient radio transmitter identification method is proposed for identifying radio transmitters. The square integral bispectra (SIB) transformation is firstly utilized to extract the features from the raw signal data of radio transmitters, which recasts the problem of communication transmitter identification into the form of measuring similarity between points in its metric space. Then we use the collaborative representation framework as a platform to develop a novel classification model, correntropy-based collaborative representation classifier (CECRC), for identifying different radio transmitters according to the similarity between the points in the SIB feature space. Extensive experimental results on real-world data sets demonstrate the effectiveness of our proposed method.

关键词： active algorithm individual communication transmitter identification correntropy collaborative representation

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A low-profile monopolar patch antenna with broad bandwidth

A low-profile monopolar patch antenna with broad bandwidth

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2011 Cross Strait Quad-Regional Radio science and Wireless technology Conference, CSQRWC 2011

作者： Ding, Xu-Min Hua, Jun Wu, Qun Dept. of Microwave Engineering Harbin Institute of Technology Harbin Heilongjiang 150001 China Science and Technology on Communication Information Security Control Laboratory Jiaxing Zhejiang 314033 China

ISBN: (纸本)9781424497904

In this paper, a low profile and broadband monopole patch antenna is proposed. The antenna consists of a monopole, which is formed by connecting six triangle plates together. A regular hexagon patch is shorted to the ground plane by six wires. The resonance frequency of the proposed antenna is 1.96GHz. The impedance bandwidth is from 1.5 to 3.4 GHz. It provides monopole-like radiation patterns over the whole bandwidth range, and its profile is much lower than a quarter-wavelength monopole antenna. The height of the antenna is equal to 0.1 λ at the resonance frequency. © 2011 IEEE.

关键词： Microstrip antennas

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Broadband microstrip antennas using complementary metamaterials structure

Broadband microstrip antennas using complementary metamateri...

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2011 Cross Strait Quad-Regional Radio science and Wireless technology Conference, CSQRWC 2011

作者： Gou, Yuanxiao Hua, Jun Wu, Qun Wang, Hailong Dept. of Microwave Engineering Harbin Institute of Technology Harbin Heilongjiang 150001 China Science and Technology on Communication Information Security Control Laboratory Jiaxing Zhejiang 314033 China

ISBN: (纸本)9781424497904

In this paper, a broadband rectangular patch antenna by using a complementary planar-patterned metamaterials is proposed. It is constructed by irregular cross gaps on the patch and ground respectively. Simulation and optimization show that both the impedance bandwidth and the radiation pattern bandwidth of the antenna are remarkable enhanced to 910 MHz (from 1.61 GHz to 2.52 GHz). Demonstrated to the left handed characteristics, the antenna's main lobe direction is changed to the horizon forward, instead of the vertical upward, and in the pass band the antenna has 5 dB average gain, and the gain is flat in the entire band. © 2011 IEEE.

关键词： Metamaterials

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The design and simulation of a metamaterial and subwavelength cavity-based antenna

The design and simulation of a metamaterial and subwavelengt...

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2011 Cross Strait Quad-Regional Radio science and Wireless technology Conference, CSQRWC 2011

作者： Han, Kuo Fu, Jiahui Wu, Qun Hua, Jun Dept. of Microwave Engineering Harbin Institute of Technology Heilongjiang Harbin 150001 China Science and Technology on Communication Information Security Control Laboratory Zhejiang Jiaxing 314033 China

ISBN: (纸本)9781424497904

In this paper, a one-dimensional metamaterial based antenna near 1.6GHz which takes some advantages from the theory of subwavelength cavity is proposed for the design of a high-gain application. The antenna above is made from grids of metal periodically. Such design can present a low phase value varying at reflecting surface which contribute to enhancement of the gain of a antenna near 1.6GHz.A kind of so-called S-shaped metamaterial is etched on the surface of the patch while the upper section - Partially Reflective Surface(PRS) of the cavity is made of two rows of metal grids orthogonal to each other. Such design of cavity is taken from the fact that the reflection phase is negative on PRS. Furthermore, several capacities are set onto the second layer of the structure of PRS in order to improve the performance of the whole system. The proposed antenna system can provide a 2dB gain enhancement to the general patch antenna. © 2011 IEEE.

关键词： Metamaterials

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A broadband compact left-handed transmission antenna loaded with EBG structures

A broadband compact left-handed transmission antenna loaded ...

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2011 Cross Strait Quad-Regional Radio science and Wireless technology Conference, CSQRWC 2011

作者： Wang, Wenruo Hua, Jun Wu, Qun Dept. of Microwave Engineering Harbin Institute of Technology Harbin Heilongjiang 150001 China Science and Technology on Communication Information Security Control Laboratory Jiaxing Zhejiang 314033 China

ISBN: (纸本)9781424497904

A novel broadband compact left-handed transmission antenna loaded with electromagnetic band-gap (EBG) structures is presented. This antenna presented has advantages with respect to conventional patch antennas, for example enhancement of bandwidth, reduction of antenna size, and multi-frequency performance. There the composite right/left-handed transmission line (CRLH-TL) structures broaden the bandwidth and decrease the operating frequency, but the gaps and vias which realize the characteristic of the CRLH-TL bring in the drawback of low gain. To reduce levels of surface modes, suppress the surface wave and enhance the antenna gain, EBG elements are loaded in the ground plane. With the proposed design, a size reduction of 36% for the operation frequency of 1.8GHz is obtained with a bandwidth of 20% and a peak gain of 3.2dB. © 2011 IEEE.

关键词： Bandwidth

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Research on Space-Time Block Code technology in MIMO System

Research on Space-Time Block Code Technology in MIMO System

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International Conference on Computer and communications (ICCC)

作者： Conglin Pan Si Chen Wei Wu Jiachuan Qian Lijun Wang Science and Technology on Communication Information Security Control Laboratory No.36 Research Institute of CETC Jiaxing China School of Electronic and Optical Engineering Nanjing University of Science and Technology Nanjing China

ISBN: (纸本)9781665409513

MIMO technology has been widely used in the telecommunication systems nowadays, and the space-time coding is a key part of MIMO technology. A good coding scheme can exploit the spatial diversity to correct the error which is generated in transmission, and increase the normalized transfer rate with low decoding complexity. On the Basis of the research on different Space-Time Block Codes, this essay proposes a new STBC, Diagonal Block Orthogonal Space-Time Block Code. Then we will compare it with other STBCs in the performance of bit error rate, transfer rate, decoding complexity and peek-to-average power ratio, the final result will prove the superiority of DBOAST.

关键词： Spatial diversity Bit error rate Encoding Decoding Complexity theory Telecommunications Block codes

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Linearized microwave downconversion link based on fast and intelligent impairment equalization for noncooperative systems

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Chinese Optics Letters 2023年第2期21卷 143-147页

作者：陈智宇钟欣蒋林徐嘉鑫刘静娴盘艳周涛 Key Laboratory of Science and Technology on Electronic Information Control Chengdu 610029China Center for Information Photonics&Communications School of Information Science&TechnologySouthwest Jiaotong UniversityChengdu 610031China Science and Technology on Communication Security Laboratory Institute of Southwestern CommunicationChengdu 610041China

We experimentally demonstrated the use of intelligent impairment equalization(IIE)for microwave downconversion link linearization in noncooperative *** an equalizer is realized based on an artificial neural network(ANN).Once the training process is completed,the inverse link transfer function can be *** the inverse transformation for the detected signal after transmission,the third-order intermodulation distortion components are suppressed significantly without requiring any prior information from an input RF ***,fast training speed is achieved,since the configuration of ANN-based equalizer is *** results show that the spurious-free dynamic range of the proposed link is improved to 106.5 dB·Hz^(2/3),which is 11.3 dB higher than that of a link without ***,the training epochs reduce to only five,which has the potential to meet the practical engineering requirement.

关键词： microwave photonics linearized downconversion link intelligent impairment equalization artificial neural network

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