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Exploration of Multiple Access Interference Suppression Based on Multi-user Detection

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Chinese Journal of Electronics 2019年第4期28卷 835-840页

作者： WU Tao jing xiaojun Beijing University of Posts and Telecommunications

A multi-user detection algorithm for multiple access interference suppression combined with the minimum mean squared error and an artificial fish swarm algorithm is proposed. By taking advantage of the artificial fish swarm algorithm, the proposed algorithm can quickly converge to the optimal solution. The variation in the minimum mean squared error based test results is assigned to the artificial fish swarm algorithm, which is regarded as the initial state of artificial fish. The simulation results show that the proposed algorithm has a better multi-user capacity performance and lower bit-error rate than the minimum mean squared error detector.

关键词： Multiple access interference suppression Minimum mean squared error Artificial fish swarm algorithm Multi-user detection algorithm Code division multiple access

Multiple Vandermonde Decomposition Based Channel Estimation for Mm Wave MIMO High-Mobility Communication in 5G and Beyond

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China Communications 2023年第4期20卷 12-25页

作者： Zhao Yi xiaojun jing School of Electronics and Information Hunan First Normal UniversityChangsha 410205China Key Laboratory of Trustworthy Distributed Computing and Service Ministry of EducationBeijing University of Posts and TelecommunicationsBeijing 100876China School of Information and Communication Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China

Millimeter wave(mmWave)massive massive multiple input multiple output(MIMO)technique has been regarded as the viable solution for vehicular communications in 5G and *** achieve the substantial increase in date rates,it is important to take an effective channel state information(CSI).However,existing channel estimation strategies are unavailable since the users *** solve above issues,in this paper,inspired by a specific antenna structure,we propose a novel approach for fast time-varying channel ***,by considering the vehicle scenario with high-mobility,a corresponding mathematical model is firstly ***,based on the special structural of the sparse array,the switch network is used to replace the convention phase shifter of mmWave hybrid system,which can effectively reduce the number of radio-frequency(RF)chains and ***,by solving the semidefinite programming(SDP)duality problem,the Doppler frequency and path parameters are effectively *** results are shown that the computational complexity and estimation accuracy of the proposed algorithm is superior than that of the traditional schemes.

关键词： MIMO mmWave channel estimation high-mobility time-variant

Two-party certificateless authenticated key agreement protocol with enhanced security

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The Journal of China Universities of Posts and Telecommunications 2019年第1期26卷 12-20,39页

作者： Wu Tao jing xiaojun School of Information and Communication Engineering Beijing University of Posts and Telecommunications

Two-party certificateless authenticated key agreement(CL-AKA) protocol is a hot topic in the field of wireless communication security. An improved two-party CL-AKA protocol with enhanced security is proposed,which is of provable security and unforgeability in the extended Canetti-Krawczyk(eCK) security model based on the hardness assumption of the computational Diffie Hellman(CDH) problem. Compared with other similar protocols, it is more efficient and can satisfy security properties such as free of the centralized management of certificate and key, free of bilinear pairings, two-party authentication, resistant to unknown key-share attack, key compromise impersonation attacks, the man-in-the-middle-attack(MIMA) of key generation center(KGC), etc. These properties make the proposed protocol have better performance and adaptability for military communication.

关键词： certificateless cryptography authenticated key agreement protocol two-party authentication protocol security properties

Correlation-based identification approach for multimodal biometric fusion

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The Journal of China Universities of Posts and Telecommunications 2017年第4期24卷 34-39,50页

作者： Ma Xin jing xiaojun School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

Information fusion is a key step in multimodal biometric systems. The feature-level fusion is more effective than the score-level and decision-level method owing to the fact that the original feature set contains richer information about the biometric data. In this paper, we present a multiset generalized canonical discriminant projection （MGCDP） method for feature-level multimodal biometric information fusion, which maximizes the correlation of the intra-class features while minimizes the correlation of the between-class. In addition, the serial MGCDP （S-MGCDP） and parallel MGCDP （P-MGCDP） strategy were also proposed, which can fuse more than two kinds of biometric information, so as to achieve better identification effect. Experiments performed on various biometric databases shows that MGCDP method outperforms other state-of-the-art feature-level information fusion approaches.

关键词： correlation analysis multimodal biometric information information fusion

Palm vein recognition method based on fusion of local Gabor histograms

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The Journal of China Universities of Posts and Telecommunications 2017年第6期24卷 55-66页

作者： Ma Xin jing xiaojun School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

Gabor features have been shown to be effective for palm vein recognition. This paper presents a novel feature representation method, implementing the fusion of local Gabor histograms （FLGH）, in order to improve the accuracy of palm vein recognition systems. A new local descriptor called local Gabor principal differences patterns （LGPDP） encodes the Gabor magnitude using the local maximum difference （LMD） operator. The corresponding Gabor phase patterns are encoded by local Gabor exclusive OR （XOR） patterns （LGXP）. Fisher＇s linear discriminant （FLD） method is then implemented to reduce the dimensionality of the feature representation. Low-dimensional Gabor magnitude and phase feature vectors are finally fused to enhance accuracy. Experimental results from Institute of Automation, Chinese Academy of sciences （CASIA） database show that the proposed FLGH method achieves better performance by utilizing score-level fusion. The equal error rate （EER） is 0.08%, which outperforms other conventional palm vein recognition methods （EER range from 2.87% to 0.16%）, e.g., the Laplacian palm, minutiae feature, Hessian phase, Eigenvein, local invariant features, mutual foreground local binary patterns （LBP）, and multi-sampling feature fusion methods.

关键词： palm vein recognition Gabor filter local histogram Fisher's linear discriminant

Study on Magnetic Domain Structure of Co/Pt Dots Array

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Chinese Journal of Electronics 2017年第3期26卷 654-657页

作者： ZHU Xifu jing xiaojun DU Huan Teacher's colleage Beijing Union University School of Information and Communication Engineering Beijing University of Posts and Telecommunications Institute of Microelectronics of the Chinese Academy of Sciences

Co/Pt multilayer dots arrays with 580-nm periodicity were fabricated using Laser interference lithography(LIL)and an ion-beam milling *** obtained uniform dots arrays with a large area by optimizing the exposure parameters and improving exposure *** obtained their shapes and magnetic domain structures and investigated using an Atomic force microscope(AFM)and Magnetic force microscope(MFM).The AFM and MFM images show:1)when their size is smaller than 400nm,the dots are in single-domain state and their shape tends to be circular;and 2)when their size is greater than 400nm,the dots are in multi-domain state and they tend to form *** dots arrays possibly can be used in nano-scale magnetic storage.

关键词： Magnetic domain structures Co/Pt dots arrays AFM and MFM images Single domain state Multi-domain state

Cooperative Spectrum Sensing Based on Centralized Double Threshold in MCN

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China Communications 2020年第5期17卷 235-242页

作者： Hai Huang Junsheng Mu xiaojun jing School of Information and Communication Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China Key Laboratory of Trustworthy Distributed Computing and Service Ministry of EducationBeijing 100876China

Cooperative spectrum sensing appears popular currently due to its ability to solve the issue of hidden terminal and improve detection performance in Cognitive Radio Networks. Meanwhile, double threshold based energy detector has attracted much attention for its low computational complexity and superior performance. Motivated by this, a cooperative spectrum sensing scheme is proposed in this paper based on centralized double threshold in the maritime communication networks(MCN), where the energy value of received signal in each cognitive node is forwarded to the fusion center for final decision based on double thresholds. Additionally, the proposed scheme is further optimized for the decisions that the energy is within the scope of maximum threshold and minimum threshold. Simulation experiments verify the performance of the proposed method.

关键词： cooperative spectrum sensing double threshold maritime communication network

Compressed Sensing of IR-UWB Wireless Sensor Network Data Based on Two-Dimensional Measurements

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Chinese Journal of Electronics 2015年第3期24卷 627-632页

作者： WANG Kai LIU Yulin WAN Qun jing xiaojun Chongqing Communication Institute China Electronic System Engineering Company University of Electronic Science and Technology of China Beijing University of Posts and Telecommunications

A novel Compressed sensing(CS) method based on two-dimensional measurements is proposed that can be effectively utilized in Impulse radio ultra-wideband wireless sensor networks(IR-UWB WSNs) to significantly reduce the energy consumption and sampling rate in sensor data transferring. We start by establishing the CS measurement model by taking both spatial and temporal correlations of Wireless sensor network(WSN) data into account. Since our model incorporates a new type of measurement matrix: the block quasi-Toeplitz structured matrix, we derive the Restricted isometry property(RIP)of the block quasi-Toeplitz structured matrix to ensure the performance of the two-dimensional recovery of WSNs data. We substantiate our mathematical analysis by numerical examples in the context of ideal spares vector and real WSN data, and results demonstrate that the approach achieves significantly saving of energy and sampling rate with small reconstruction error.

关键词： Compressed sensing Wireless sensor net-works IR-UWB Measurement Restricted isometry property

Local Gabor Dominant Direction Pattern for Face Recognition

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Chinese Journal of Electronics 2015年第2期24卷 245-250页

作者： LIU Jun jing xiaojun SUN Songlin LIAN Zifeng Beijing University of Posts and Telecommunications

We propose a novel face image representation – Local gabor dominant direction pattern(LGDDP)for face recognition. The face image is convolved with the Gabor filters, resulting in multiple response images of different orientations and scales. The response images' each pixel is encoded by the LGDDP descriptor from the pixel's dominant neighboring one or two pixels. The image formed by the LGDDP descriptor is partitioned into multiple regions and the histogram is extracted from each region. All the histograms are concatenated into the spatial *** nearest neighbor classifier and the weighted intersection histogram similarity measure are used for face image classification. The advantage of the proposed LGDDP method lies in the high recognition rate performance and the low computational complexity. Extensive experiments are performed on FERET face image database and the experimental results verify the LGDDP's effectiveness by comparing LGDDP with other well-known published face recognition methods.

关键词： Face recognition Spatial histogram Gabor filter