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International Congress on Image and signal processing

作者： Yu Jia Qing He Lai Yuan Luo National Key Laboratory of Science and Technology on Blind Signal Processing

ISBN: (纸本)9781467390996

Due to the decrease of azimuth resolution and array gain, the performance of small aperture over the horizon radar (OTHR) is not as good as the conventional OTHR. Therefore, it is necessary to find a new method to improve array performance of small aperture OTHR to satisfy the requirements of target detection. In this paper, conclusions on the performance losses are obtained by deducing the expression of signal to clutter ratio (SCR) under small aperture OTHR receiving condition. Based on the conclusions, Hyper Beam, which is derived from sonar array processing, are applied to improve the performance of small aperture OTHR. Eventually, experimental simulations are given to verify our conclusions.

关键词： HBF Small aperture OTHR UCA SCR UCA Thyristors Fetal Hemoglobin apertures azimuth resolution Object detection

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Reconstruct LDPC Codes in a Noisy Environment

Reconstruct LDPC Codes in a Noisy Environment

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2015 IEEE International Conference on Progress in Informatics and Computing(PIC 2015)

作者： Xin Bao Yuanling Huang Guiliang Wang National Key Laboratory of Science and Technology on Blind Signal Processing

Focus on the problem of reconstructing LDPC codes in a noisy environment, an algorithm based on Column Elimination Operation, Parity-Check Vector Judgment Criterion and Gradual Row Transformation is proposed, which is used to blind recognize LDPC codes. This algorithm first gets enough dual vectors of the receive codes, then selects real parity-check vectors of the dual-space of LDPC codes, and then, detectives and deletes the error code words. The above steps are iteratively carried out until the original problem is reduced to an easier problem, i.e., blind recognition LDPC codes in an error-free context, and finally obtain the sparse parity-check matrix by using Gradual Row Transformation. The simulation and experiment results show that, this algorithm fits most of LDPC standards, including 802.16 e, 802.11 n, DVB-S2, GJB7296, GB20600, etc., and it is an effective solution for LDPC codes blind recognition in a noisy environment.

关键词： channel coding LDPC codes blind recognition error bit

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PGST: Using Personal and Global Factors in the Spatio-Temporal Domain for Mobility Relationship Measurement

PGST: Using Personal and Global Factors in the Spatio-Tempor...

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International Conference on Computer sciences and Applications (CSA)

作者： Tao Guan Ke-Ren Wang National Key Laboratory of Science and Technology On Blind Signal Processing Chengdu China

ISBN: (纸本)9781479999620

As well-developed social networking services collect rich location data of mobile users, it becomes interesting for measuring the mobility relationship strength. The state-of-the-art measure for such relationship is Personal, Global and Temporal factors (PGT) method, which calculates personal and global background in the spatial domain. We argue that meeting events differentiate from each other not only in the spatial domain, but also in the temporal domain. Accordingly, a novel method called PGST for measuring the mobility relationship is proposed. Additional time differences are introduced into the personal and global factors. Thus, background effects of location and time are removed from primitive meeting events. Experiments on real dataset suggest that our method significantly outperforms the state-of-the-art methods.

关键词： Time measurement Trajectory Mobile communication Frequency measurement Entropy Data mining Weight measurement

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Simulation of Command and Control Network Services Base on M2E2M

Simulation of Command and Control Network Services Base on M...

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International Conference on Information sciences,Machinery,Materials and Energy（ICISMME 2015）

作者： Pu An Ying Chen Science and Technology On Blind Signal Processing Laboratory Sichuan International Studies University

With network simulation tools to simulate C2(Command and control) network services,the simulated network will reflect the relationship between the internal units and dynamic behaviors of the real C2 ***,the service operating mode exactly matches the organization structure of the C2 network,the service operating mode can't be extended to other C2 networks through the hard-code *** this regard,this paper presents the M2E2M(Model to Event to Message) *** drawing the ideas of colored,timed,object Petri nets,we propose the Petri nets based modeling method of C2 network *** using CPN Tools to simulate the model,we generate communication events set and achieve the conversion from model to *** the VRNET Developer simulation platform,we complete the simulation of the events set and achieve the conversion from event to message through the development of the Cmd Engine and Cmd App *** we complete the simulation of an early warning service of a C2 *** simulation results match the network organization structure and the simulation method is proved to be effective.

关键词： C2 networks network simulation Petri nets VRNET Developer

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Feature Preprocessing Algorithm Based on One-Class Classifier

Feature Preprocessing Algorithm Based on One-Class Classifie...

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International Conference on Computer science and Network technology

作者： Wenya Gan YuanLing Huang Ling You National Key Laboratory of Science and Technology On Blind Signal Processing Chengdu China

ISBN: (纸本)9781467381741

Aiming at the problem of features instability in specific emitter identification, this paper presents a based on one-class classifier feature preprocessing algorithm to detect the unstable features. The algorithm takes advantage of one-class classifier of property that can describe the distribution of given data sets. Its basic steps include: Firstly, we divide the feature time series into N segments with given length;secondly selecting one segment trains one-class classifier acquiring classification surface, and then remaining N-l segments test the classifier and record the test accurate rates for every segments;finally we compare the minimize of test results with the setting threshold. If the minimize of test rate is lower than threshold in the test segments, we consider the feature is unstable. For a given set of data, experimental results show that the method is effective on determining the feature of stability.

关键词： specific emitter identification instability feature preprocessing one-class classifier Classifiers Dataset Unstable basic sequence Time series

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Reconstruct LDPC codes in a noisy environment

Reconstruct LDPC codes in a noisy environment

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IEEE International Conference on Progress in Informatics and Computing (PIC)

作者： Xin Bao Yuanling Huang Guiliang Wang National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu China

Focus on the problem of reconstructing LDPC codes in a noisy environment, an algorithm based on Column Elimination Operation, Parity-Check Vector Judgment Criterion and Gradual Row Transformation is proposed, which is used to blind recognize LDPC codes. This algorithm first gets enough dual vectors of the receive codes, then selects real parity-check vectors of the dual-space of LDPC codes, and then, detectives and deletes the error code words. The above steps are iteratively carried out until the original problem is reduced to an easier problem, i.e., blind recognition LDPC codes in an error-free context, and finally obtain the sparse parity-check matrix by using Gradual Row Transformation. The simulation and experiment results show that, this algorithm fits most of LDPC standards, including 802.16e, 802.11n, DVB-S2, GJB7296, GB20600, etc., and it is an effective solution for LDPC codes blind recognition in a noisy environment.

关键词： Complexity theory Cryptography IEEE 1394 Standard Presses Microwave communication Microwave FET integrated circuits

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Reconstruct LDPC codes in an error-free environment

Reconstruct LDPC codes in an error-free environment

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International Conference on Computer science and Network technology (ICCSNT)

作者： Xin Bao Yuanling Huang WenYa Gan Ling You National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu China

This paper presents two algorithms to recover LDPC codes in an error-free environment. Both algorithms reconstruct the sparse parity-check matrices of LDPC codes based on elementary row transformation, and are equivalent to recognize LDPC codes. The first one is appropriate to the LDPC codes whose parity-check matrices have the double-diagonal structure; the second one is a general algorithm that ensures the second-best solution for every type of LDPC codes. Simulation results show that, these algorithms work well with most of LDPC standards and protocols, including 802.16e, 802.11n, DVB-S2 GJB7296 and GB20600.

关键词： Sparse matrices Parity check codes signal processing algorithms Block codes Algorithm design and analysis Hamming weight Standards

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Efficient connection management solution in high-speed networks

Efficient connection management solution in high-speed netwo...

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International Conference on Electronics Information and Emergency Communication

作者： Rongji Liu Yunzhao Li Qiang Wei National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu China

Poor data locality in high-speed networks leads to more memory accesses of connection management, which limits the throughput performance. In view of the above problem, this paper analyzed the process of connection management and access in detail, and put forward the efficient connection management solution to improve throughput on FPGA platform. This solution takes full advantage of the structural characteristics of SDRAM. By controlling access requests, it can make adjacent access requests access different banks, which can reduce hardware resource conflicts, shorten the time interval between access requests and improve throughput. In order to reduce the complexity of control, we selected multiple slots hash table as the data structure for connection management. Simulation results show that this solution shorten the time interval by about 71.4%.

关键词： Field programmable gate arrays Memory management Internet High-speed networks Throughput Random access memory Clocks

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Research on target model and echeos spatial correlation of distributed radar

Research on target model and echeos spatial correlation of d...

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IET International Radar Conference 2015

作者： K. K. Song T. Sun H. F. Peng K. Li National Key Laboratory of Science and Technology On Blind Signal Processing ChengDu China

ISBN: (纸本)9781510822023

The spatial correlation of target echoes is important to jointly process signals received at each radar substation in distributed radar system. On the background of space surveillance with two independent monostatic radars, a three-dimensional cylinder target scattering model and echo signal model are built combined the orbital motion. The echoes spatial correlation is analysed and correlation coefficient which varies with the included angle between two radars and target is derived. The reasonableness of target scattering model and validity of theoretical analysis are proved via simulation examples.

关键词： distributed radar radar echoes spatial correlation target scattering model

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Space debris detection performance analysis of space-based MMW radar

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Journal of Beijing Institute of technology (English Edition) 2015年 24卷 110-115页

作者： Dang, Tong-Xin Peng, Hua-Feng Wang, Feng Zhao, Yong-Jun National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu610041 China Zhengzhou Information Science and Technology Institute Zhengzhou450002 China

A numerical performance analysis method with real space objects' TLE data to evaluate the detection performance of space-based radar is delivered. Firstly, two radar models are built in Satellite Tool Kit (STK) to simulate phased array radar and CW fence radar, some performance indexes including detection ratio, mean detection number per day and mean detection duration etc for evaluation are defined too. After definition of simulation scenario, a series of simulations in STK with real space objects' TLE data are made and calculation results are analyzed in the paper. The selected performance indexes are calculated according to different radar models, radar parameters, and orbit elements. Finally, derived conclusions show that optimization must be made in space-based MMW radar space objects detection system design for better performance. The method and conclusion will be useful for space-based radar system design. © 2015 Beijing Institute of technology.

关键词： Space debris

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