最新刊期
卷 34 ， 期 2 ， 2018
- 摘要：The purpose of automatic speech recognition (ASR) is to make the machine to be able to “understand” the human speech and transform it to readable text information.ASR is one of the key technologies of human machine interaction and also a hot research domain for a long time.In recent years,due to the application of deep neural networks,the use of big data and the popularity of cloud computing,ASR has made great progress and break through the threshold of application in many industries.More and more products with ASR have entered people’s daily life,such as Apple’s Siri,Amazon’s Alexa,IFLYTEK speech input method and Dingdong intelligent speaker and so on.The development status and key breakthrough technologies in recent years were introduced.Also,a forecast of ASR technologies’ trend of development was given.关键词：automatic speech recognition;deep neural network;acoustic model;language model5135|9749|0更新时间：2024-06-05
View the focus
- 摘要：Aiming at the problem of impulse noise with large amplitude fluctuation and strong time-varying characteristics,which seriously affected the communication performance of power carrier network,the power line network topology and the classical routing algorithm of power line carrier communication were analyzed,and on this basis,an algorithm of overlapping hierarchical induction algorithm (OHIA) was proposed,which proved the feasibility of the algorithm and gave the inductive factor transfer algorithm,route addressing process and forecast based route maintenance strategy.Through the NS-3 simulation platform to establish the PLC model,respectively,ant colony algorithm and overlapping layer induced PLC automatic routing algorithm were simulated.The simulation results show that compared with the ant colony algorithm,the proposed algorithm improves the success rate of the first communication in the strong time-varying channel environment,and makes great progress in the large-scale networking of PLC.关键词：power line carrier communication;network routing;induced factor;automatic routing812|1345|0更新时间：2024-06-05
- 关键词：TD-LTE;radar fuse;interference analysis;power comparison480|392|0更新时间：2024-06-05
- 摘要：Diversity reception is one of the most effective ways to resist fading over Rayleigh fading channels,in order to improve the performance of Polar codes over Rayleigh fading channels,a diversity reception system based on Polar code was proposed.The information bit selectionsequences of Polar codes in diversity reception were determined,and the upper bound of BER for Polar codes in diversity reception system was derived.The simulation results show that when quadruple diversity reception is used,the encoding gain is greater than 3 dB and has 0.6 dB performance advantage compared to LDPC code.Experiment results show that,when eightfold diversity is used,the encoding gain is greater than 5 dB and has 1.5 dB performance advantage compared to LDPC code,and diversity reception can significantly improve the performance of the system.关键词：Polar code;Rayleigh channel;diversity reception746|1356|0更新时间：2024-06-05
- 摘要：Intelligent jammer can analyze the history of user’s transmission and control their own behavior,so it has brought new threats to the wireless network.In order to analyze the behavior of users and intelligent jammers in a multi-channel wireless network,a dynamic Stackelberg game with incomplete information was modelled.In the model,it was assumed that the intelligent jammer followed the user and they transmitted at a same wireless channel,and both of them took power control as their strategy.Furthermore,their benefit functions were designed of which the observation error of the jammer was taken into account.Then,the Stackelberg equilibrium (SE) point of the game model was derived and the existence and the uniqueness of the SE were proved.The validity of the multi-channel dynamic Stackelberg game anti-jamming model with incomplete information was verified by simulations.关键词：wireless network;anti-jamming;Stackelberg game;incomplete information;power control640|1086|0更新时间：2024-06-05
- 摘要：An electronic disguised voice detection algorithm based on the statistical features of MFCC and the convolution neural network was proposed.Firstly,the statistical features of MFCC were extracted and reconstructed as the input of convolution neural network.Considering the convolution kernel size,the number of convolution kernels and the pooling size,24 different network structures were evaluated in this work.Finally,the convolution neural network structure which could be effectively used for electronic disguised voice detection was determined.The experimental results show that the proposed algorithm can effectively detect the trace of electronic disguising.Meanwhile,the specific forgery operation of the electronic disguised voice can also be estimated.关键词：electronic disguised voice;convolutional neural network;MFCC505|1040|0更新时间：2024-06-05
- 摘要：The problem addressed here is generator polynomial estimation of linear feedback shift register (LFSR) sequence.An algorithm based on the Galois field Fourier transform (GFFT) was proposed.The relationship between non-zero points in GFFT of LFSR sequence and zero points in generator polynomial of LFSR sequence was illustrated firstly.Then the generator polynomial of LFSR sequence was fast estimated based on that property,and the improved method in noisy environment was proposed at last.Validity of the algorithm is verified by the simulation results,and the computational load is illustrated.The computational efficiency of the proposed algorithm is higher than that of the existing algorithms.关键词：signal processing;linear feedback shift register;Galois field Fourier transform;generator polynomial483|1456|0更新时间：2024-06-05
- 摘要：In order to improve the accuracy of k connectivity path detection algorithm in wireless sensor network (WSN),a k connectivity path detection algorithm based on distributed hue recognition for WSN was proposed.Firstly,the model structure of the WSN network was given by use of the graph model,and the theoretical definition of the model was given.Secondly,according to the proposed WSN model,the disjoint paths for each node to the sink node were calculated,and cat culated using the minimum value,so as to achieve accurate detection of the boundary between the value of k.Finally,the validity of the algorithm was verified by experiment simulation.关键词：hue;wireless sensor network;graph model;path detection354|728|0更新时间：2024-06-05
- 摘要：A new method of modulation parameter estimation was proposed to process the sinusoidal frequency modulated continuous wave signal intercepted by electronic reconnaissance.Firstly,based on the periodicity of signal modulation function,the modulated frequency was estimated using autocorrelation function.And then,the frequency modulation curve was extracted and revised based on rearranging spectrogram.Finally,the carrier frequency,the modulation exponent and the initial phase were estimated by the frequency modulation curve.The simulation experiment results show that the proposed method does not require prior knowledge,and the mean square error of each modulation parameter can reach -25 dB by using this method when SNR is -5 dB.关键词：sinusoidal frequency modulated continuous wave signal;parameter estimation;autocorrelation function;rearrangement spectrogram671|892|0更新时间：2024-06-05
- 摘要：In order to improve the flexibility of the activation function of the blind detection algorithm in Hopfield neural network,an activation function with better nonlinear approximation ability near the origin was proposed.For the case where the algorithm trapped in local optima,utilizing the good ergodicity and randomness of chaos mapping,chaos was used to generate the initial sequence at the starting point of the algorithm,and small-amplitude chaotic perturbation was performed when the current global optimum value was constant,so as to reduce the error performance of the algorithm.The simulation results show that the proposed algorithm reduces the sensitivity of neurons to input values,has strong anti-interference ability and fast convergence speed,and improves the blind detection performance.关键词：blind detection;chaos disturbance;Hopfield neural network;activation function370|881|0更新时间：2024-06-05
research and development
- 摘要：With the development of virtual reality technology,the formulation and perfection of omnidirectional media system standard plays a more important role.In order to standardize the virtual reality system,it is of great value to study the system architecture of omnidirectional media.Firstly,the current development of virtual reality technology and the problems in practical application were reviewed.Secondly,the structure and development trend of the application framework of omnidirectional media were introduced.Then the application architectures of MPEG OMAF,Facebook and Google were introduced separately.Through the comparative analysis of several system architecture schemes,the development of omnidirectional multimedia was summarized and prospected.关键词：virtual reality;omnidirectional media;OMAF;application architecture;standard organization1256|2003|0更新时间：2024-06-05
summarize
- 摘要：With the improvement of computing capability and security requirements for intelligent terminals,the virtualization technology has been gradually developed and applied,which is originally created in the server and desktop computer industry.The application scenarios,a variety of different implementation and security requirements of virtualization were analyzed by contrasting to the computer servers.关键词：intelligent terminal;virtualization;isolation764|2982|0更新时间：2024-06-05
- 摘要：With the fast increasing computing and storage capability,the intelligent terminal has gradually became the most important personal information assistant,and the data security of the terminal has turned to be essential for customers.Data encryption is a basic component of security assurance,but currently the mainstream technology scheme has a series of drawbacks,such as high technical cost.Therefore,a data encryption scheme based on cloud and terminal collaboration was proposed to promote the security of keys and data files.关键词：cloud and terminal collaboration;intelligence terminal;data encryption624|1209|0更新时间：2024-06-05
- 摘要：Mobile intelligent terminal is the key entry to the internet services.Combining mobile intelligent terminal with office platform becomes a new mode of mobile OA,which is able to overcome the space-time limitation of traditional office model.To improve the efficiency of management and work,and to ensure the security of data,the security requirements of mobile OA were analyzed,a secure and controllable office system for mobile intelligent terminal also could be designed.The system structure,security function module,and business process were introduced,as well as the main function of mobile OA system was realized.By providing the unified management for mobile devices,data security based on licensing and use-control could be achieved.关键词：intelligent terminal;mobile OA;data security;identity authentication;device authentication582|1009|0更新时间：2024-06-05
- 摘要：The flourish and popularity of Android terminals have greatly changed the peoples’ daily life and also brought new conditions to the internet Dark Industry Chain.The features of advanced malicious programs on intelligent terminals,and the reasons why an audit method of network activities was needed were discussed.At last,a solution was proposed,including the data collecting,the process of auditing and the management of audit policies.关键词：intelligent terminal;application audit;combination of cloud and terminal403|859|0更新时间：2024-06-05
- 摘要：The advantages,drawbacks and security of different mobile payment models were analyzed,and the defects of the existing mobile payment schemes were pointed out.To solve the above problems,a new mobile payment scheme based on the NFC and fingerprint identification was designed.The main function modules and date flow of the scheme were introduced.The prototype of the mobile payment system was realized.The main function and the whole technological process were tested,and significant references for establishing NFC based mobile payment systems were also provided.关键词：intelligent terminal;mobile internet;mobile payment;NFC;fingerprint identification667|1543|0更新时间：2024-06-05
Column:intelligent terminal security
- 摘要：IEEE has formed the 100 Gbit/s-EPON Task Force to develop next 100 Gbit/s-PON standards，and the duo-binary(DB) detection is one of the baseband technology options.25 Gbit/s DB detection transmission performance with 10 Gbit/s-PON receiver was been experimentally demonstrated.Because the bandwidth of 10 Gbit/s- PON receiver is obviously limited,the 25 Gbit/s DB output signal from 10 Gbit/s-PON receiver will be affected by the inter-symbol interference(ISI).The experiment results show that the system receiving sensitivity based on direct decision method is only -22 dBm.However,the system receiving sensitivity can be up to -24.5 dBm by using the most simplified maximum likelihood sequence estimation(MLSE) soft decision method.关键词：100 Gbit/s-EPON;duo-binary detection;receiving sensitivity;MLSE405|871|0更新时间：2024-06-05
- 摘要：The array antenna model and its parameters in ITU-R REC M.2101 were introduced in detail,and the model would be implemented in IMT deployment scenario modeling.Based on the lumped interference assessment method,the interference of the large-scale base station deployment to the central earth station at different distances was simulated,and the distance was protected by comparing the interference threshold.The research results can provide reference for future IMT system design and deployment,5G or related frequency planning.关键词：interference analysis;5G;array antenna;earth station;1.4 GHz615|1297|0更新时间：2024-06-05
- 摘要：Combining the power industry with cloud computing technology,a systematic study on safety analysis and evaluation methods of the power cloud was carried out.A comprehensive combing on functional entities and business processes of the power information system under the cloud environment was conducted.Through the combination of static STRIDE threat modeling and dynamic attack chain algorithm,the main risks of cloud platform were classified and quantified.A security protection architecture of power cloud system was put forward to promote the popularization and application of cloud computing in the power industry,and to provide a strong support for the safety and control of power information system.关键词：power cloud;risk analysis;threat modeling;attack chain413|1449|0更新时间：2024-06-05
- 摘要：Coordination and innovation of cloud-network will become the differentiated competitive advantage of telecom operators,the integration innovation based on the existing cloud network soltions will be the basic,and the business innovation of cloud-network coordination will be the most important.Based on this,the core concept,industry development,typical services,and industry trends were reviewed and analyzed.The core needs of business application of cloud-network coordination of telecom operators were summarized.A hierarchical functional architecture of cloud-network coordination service based on overlay technology was analyzed,and the key technologies were described.The reference system architecture of cloud-network coordination of telecom operators were proposed based on the cloud business needs and network developing status of telecom operators.And the typical business scenaries of cloud-network coordination of telecom operators were emphatically analyzed.关键词：cloud-network coordination;overlay;vCPE;VNF;zero-touch deployment;scenario1160|2113|0更新时间：2024-06-05
- 摘要：Due to the advantage of rigidity pipeline,SDH is irreplaceable in carrying high priority service circuit.However,it will withdraw because of equipment ageing.A solution of OTN system with VC cross-connecting function was proposed for the situation which SDH network faced,which could minimize space requirements,conserve energy,save the resource of optical fiber and reduce the operational risk while keeping the advantage of OTN high bandwidth transmission.Pilot testing proves that the system works well and accords with correlative criterion.关键词：SDH network;VC-OTN;pilot;testing1689|1538|0更新时间：2024-06-05
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