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Research on heart sound identification technology

Science china(Information Sciences) 2012年第2期55卷 281-292页

作者： CHENG XieFeng1,3,MA Yong2.LIU Chen1,ZHANG XueJun1 & GUO YuFeng11School of Electronic Science and Engineering,Nanjing University of Posts and Telecommunications,Nanjing 2.0003,china 2.chool of Computer Science and {2.,Nanjing University of Science and {2.,Nanjing 2.0094,china 3.ey lab of broudbard wireless communication and sensor network technology(Nanjing University of Posts and Telecommunications),ministry of education,Nanjing 2.0094,china 1. School of Electronic Science and Engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China3. Ministry of Education Key Lab of Broudbard Wireless Communication and Sensor Network Technology (Nanjing University of Posts and Telecommunications) Nanjing 210094 China2. School of Computer Science and Technology Nanjing University of Science and Technology Nanjing 210094 China

In this article,both the basic principles and the experimental methods of identity recognition technology based on heart sounds are ***,the characteristics of heart sounds and the feasibility of heart sounds as a biometric were analyzed.A synthetic model of heart sounds was then developed based on a family of wavelets;Finally,the characteristic parameters of heart sounds were extracted by using the heart sounds linear band frequency cepstra(HS-LBFC)with a specified configuration,and the similarity distance was adopted for heart sound *** highlight the difference in two heart sound signals between the time and frequency domains,a construction method of the heart sound wavelet,a calculation method of the parameters of a synthetic model,selection of the characteristic parameters of heart sounds and the corresponding data processing technology were *** experimental results showed that the proposed method exhibited excellent performance and practicability.

关键词： biometric wavelet family of heart sounds synthetic model of heart sounds heart sounds linear band frequency cepstra(HS-LBFC)

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AN IMPROVED EPON UPSTREAM TRANSMISSION SCHEME WITH ZERO INTER-PERIOD IDLE LOSS

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Journal of Electronics(china) 2011年第Z1期 664-669页

作者： Shen Jianhua Guo Hongmei Mi Zhengkun(Key lab of Broadband {2. communication and sensor network technology(NUPT),ministry of education,Nanjing University of Posts and Telecommunications,Nanjing 2.0003,china)

Existing Ethernet Passive Optical network(EPON) Dynamic Bandwidth Allocation(DBA) algorithms suffer from the disadvantage of idle time loss,which lower the upstream bandwidth *** letter proposes an improved upstream transmission scheme with idle-time eliminating *** analysis and numerical calculation prove that the improved scheme can ef-fectively eliminate the idle time and enhance the efficiency of upstream link *** results have shown that the bandwidth utilization can be raised up to 15% in heavy-load scenarios while the time delay performance of Assured Forwarding(AF) and Best Effort(BE) services are improved simultaneously.

关键词： Ethernet Passive Optical network(EPON) Dynamic Bandwidth Allocation(DBA) algorithm Channel transmission scheme Idle time eliminating

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COMPRESSED SPEECH SIGNAL SENSING BASED ON THE STRUCTURED BLOCK SPARSITY WITH PARTIAL KNOWLEDGE OF SUPPORT

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Journal of Electronics(china) 2012年第Z1期 62-71页

作者： Ji Yunyun* ** Yang Zhen** Xu Qian* *(College of communication and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing 2.0003, {2.) **(Key lab of Broadband wireless communication and sensor network technology, ministry of education, Nanjing University of Posts & Telecommunications, Nanjing 2.0003, {2.)

Structural and statistical characteristics of signals can improve the performance of Compressed Sensing (CS). Two kinds of features of Discrete Cosine Transform (DCT) coefficients of voiced speech signals are discussed in this paper. The first one is the block sparsity of DCT coefficients of voiced speech formulated from two different aspects which are the distribution of the DCT coefficients of voiced speech and the comparison of reconstruction performance between the mixed program and Basis Pursuit (BP). The block sparsity of DCT coefficients of voiced speech means that some algorithms of block-sparse CS can be used to improve the recovery performance of speech signals. It is proved by the simulation results of the mixed program which is an improved version of the mixed program. The second one is the well known large DCT coefficients of voiced speech focus on low frequency. In line with this feature, a special Gaussian and Partial Identity Joint (GPIJ) matrix is constructed as the sensing matrix for voiced speech signals. Simulation results show that the GPIJ matrix outperforms the classical Gaussian matrix for speech signals of male and female adults.

关键词： Compressed Sensing (CS) Speech signals Sensing matrix Block sparsity

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A NEW AD HOC ROUTING ALGORITHM BASED ON MINIMIZING THE CHANNEL HANDOFF

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Journal of Electronics(china) 2010年第6期27卷 749-755页

作者： Xie Jin Zhu Qi Li Zongshou Jiangsu Key laboratory of {2. communications Nanjing University of Posts and Telecommunications Nanjing 210003 China） Key lab on Wideband {2. communications and sensor network technology of ministry of education Nanjing University of Posts and Telecommunications Nanjing 210003 China National Mobile communications Research laboratory Southeast University Nanjing 210003 China

How to improve the performance of the wireless Ad Hoc network by utilizing the spectrum resources efficiently has become a hot research topic in recent years. In this paper we propose a reactive routing algorithm that supports multiple channels to improve the performance of the Ad Hoc network based on the minimizing of the channel handoff. Our approach allocates the communication channel during the route discovery, and notifies the allocated channel information to the corresponding node in the route reply packets. Each node in the route tries its best to choose the same channel with the upstream node without interference. The simulation results show that our algorithm performs better than the K-hop distinct protocols in both average delays and network throughputs

关键词： Ad Hoc Multi-channel Channel handoff network throughputs Routing

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TWO-WAY DENOISE-AND-FORWARD network CODING OPPORTUNISTIC RELAYING AIMING AT MINIMIZING EUCLIDEAN DISTANCE IN MULTI-ACCESS PHASE

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Journal of Electronics(china) 2011年第Z1期 433-443页

作者： Jia Xiangdong* ** *** Yang Longxiang* ** Shao Shixiang* ** *(wireless communications K{2. lab of Jiangsu Province,Nanjing University of Posts and Telecommunications,Nanjing 2.0003,china) **(K{2. lab of Broadband wireless communication and sensor network {12.,ministry of education,Nanjing University of Posts and Telecommunications,Nanjing 2.0003,china) ***(College of Mathematics and Information Science,Northwest Normal University,Lanzhou 730070,china)

To exploit the effect of modulation schemes on the best relay selection,a novel Jointing Modulation schemes max-min criterion(JM-max-min) is proposed firstly for Two-Way De-Noise-and-Forward(DNF) Opportunistic Relaying systems(TW-DNF-OR) by aiming at minimizing the Pairwise Error Probability(PEP) of Multi-Access(MA) phase which dominates the error per-formance of TW-DNF-OR due to the presence of MA *** proposed JM-max-min criterion integrates perfectly the minimum distances of constellations and the relay links ***,with the proposed JM-max-min criterion,we analyze the Symbol Error Probabilities(SEPs) of MA phase and BroadCast(BC) phase by using the approximated mathematics analysis,and present the corresponding closed-form expressions to *** numerical analysis shows,for a given modulations combination at both sources,the TW-DNF-OR systems with the proposed JM-max-min criterion outperform the one with the conventional max-min criterion.

关键词： Cooperative communications Opportunistic relaying network coding Max-min crite-rion

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Ether net Ring Protection for ITU-T G.8032

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china communications 2012年第11期9卷 87-97页

作者： Wang Bin Wang Wennai College of Telecommunications and Information Engineering Nanjing University of Posts and Telecommunications Nanjing 210003 P. R. China Key laboratory of Broadband {2. communication and sensor network technology (Nanjing University of Posts and Telecommunications) Ministry of Education Nanjing 210003 P. R. China

Ethernet Ring Protection (ERP) introduced by ITU-T G.8032.Recommendation is a new type of packet-switched network protection technology, which can provide ring automatic protection switch. However, the Filtering Database (FDB) flush method adopted in the current ERP standard has the drawback of introducing a large amount of transient traffic overshoot caused by flooded Ethernet frames right after protection switching. In this article, we propose a G.8032.ERP scheme that uses FDB flush based on area to resolve this issue and investigate how the proposed scheme deals with the traffic flooding problem. The theoretical analysis and simulation show that the proposed scheme can effectively improve the performance of the Ethernet ring by decreasing the unnecessary FDB flush in comparison with the existing approaches.

关键词： carrier ethernet ERP FDB flush markov chain

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Green networking Based Energy Efficient communications

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china communications 2012年第2期9卷 22-30页

作者： Wang Wennai Mi Zhengkun Wang Bin Key lab of Broadband {2. communication and sensor network technology(Nanjing University of Posts andTelecommunications) Nanjing 210003P.R.China

The mainstream approaches to green networking are discussed first from the view of engineering,including resource consolidation,server virtualization,selective connectedness,and proportional computing.A brief introduction to network virtualization techniques is given then and a virtual node embedding approach is ***,three kinds of enhanced green networking schemes by network virtualization are proposed,that is enhancement to sever virtualization,resource consolidation and Adaptive Link Rate(ALR).Examples are included to show the virtue of network virtualization to green networking in terms of energy efficient communications.

关键词： energy efficient communications greennetworking network virtualization green of Infor-mation and communications technology (ICT)

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Optimal power allocation for cognitive relay networks: amplify-and-forward versus selection relay

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Science china(Information Sciences) 2011年第4期54卷 861-872页

作者： YUE WenJing 1,2.ZHENG BaoYu 1,2.MENG QingMin 1,YUE WenJie 3 & CUI JingWu 1 1 Institute of Signal Processing and Transmission,Nanjing University of Posts and Telecommunications,Nanjing 2.0003,china 2.Department of Electronic Engineering,Shanghai Jiaotong University,Shanghai 2.02.0,china 3 Shanxi Institute of educational Science,Taiyuan 030009,china 1. Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China2. Department of Electronic Engineering Shanghai Jiaotong University Shanghai 200240 China3. Shanxi Institute of Educational Science Taiyuan 030009 China

We consider a cognitive relay network which is defined by a source,a destination,and cognitive relay nodes and primary user *** this network,a source is assisted by cognitive relay nodes which allow coexisting with primary user nodes by imposing severe constraints on the transmission power so that th{2. operate below the noise floor of primary user *** this paper,we mainly study the power allocation strategies of this system to minimize the outage probability subject to total and individual power constraints for cognitive relay nodes and subject to interference constraints for primary user nodes.A relay transmission scheme,namely amplify-and-forward (AF),is *** first present an optimal power allocation (OPA) scheme to minimize the system outage probability,based on instantaneous channel state information among the source,destination and relay nodes and mean channel gains between primary user nodes and cognitive ***,we propose a selection AF scheme (S-AF) where the single best relay is chosen to assist in the transmission and study power allocation strategy for S-AF to minimize outage *** analytical power allocation strategies have been validated through numerical *** results indicate that the AF with OPA and S-AF with OPA have significantly better outage behavior and average throughput than AF and S-AF schemes *** also find that S-AF with OPA achieves a higher throughput,and hence lower outage probability than AF with OPA.

关键词： cognitive radio (CR) relay networks power allocation outage probability

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Robust cooperative spectrum sensing schemes for fading channels in cognitive radio networks

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Science china(Information Sciences) 2011年第2期54卷 348-359页

作者： YUE WenJing1,2. ZHENG BaoYu1,2. MENG QingMin1, CUI JingWu1 & XIE PeiZhong1 1Institute of Signal Processing and Transmission, Nanjing University of Posts and Telecommunications, Nanjing 2.0003, china 2.epartment of Electronic Engineering, Shanghai Jiaotong University, Shanghai 2.02.0, china 1. Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China2. Department of Electronic Engineering Shanghai Jiaotong University Shanghai 200240 China

In cognitive radio systems, cooperative spectrum sensing can detect the presence of the primary user accurately. In practice, however, since the sensing observations are forwarded to a data collector through fading channels, the sensing performance is severely degraded. To deal with this problem, in this paper, we first propose a secondary user selection based cooperative spectrum sensing method to improve sensing performance by decreasing the reporting errors introduced by the fading channels. More specifically, only the secondary users with better signal-to-noise ratio (SNR) for reporting channels are allowed to send their local binary decisions (0 or 1) to the data collector while the others will send nothing. Additionally, we further propose a diversity based cooperative spectrum sensing method which applies existing space-time coding. By exploiting space diversity in CR network, the reporting errors introduced by the fading channel can be decreased and then the sensing performance is improved significantly. For either proposed cooperative spectrum sensing method, the sensing performance is derived and the analytical performance results are given. Our analysis and numerical results verify that proposed methods outperform the conventional cooperative spectrum sensing with OR-rule by taking into account the error effect on the reporting channels.

关键词： cognitive radio (CR) spectrum sensing energy detection diversity technique space-time coding

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NEAR OPTIMAL CLUSTER-HEAD SELECTION FOR wireless sensor {2.S

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Journal of Electronics(china) 2007年第6期24卷 721-725页

作者： Zhu Xiaorong Shen Lianfeng National Mobile Comm. Research lab Southeast University Nanjing 210096 China

Clustering in wireless sensor {2.s is an effective way to save energy and reuse bandwidth. To our best knowledge, most of the clustering protocols proposed in literature are of a dynamic type, where cluster heads are selected in each period, followed by cluster formation. In this paper, a new static type clustering method called Hausdorff clustering, which is based on the location of sensor nodes as well as communication efficiency and {2. connectivity, is proposed. The cluster head, however, is rotated within the cluster by a fuzzy logic algorithtn that optimizes the {2. lifetime. Simulation results show that this approach can significantly increase the lifetime of the sensor {2..

关键词： sensor networks Hausdorff clustering Fuzzy logic

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