This paperdeals with modulation classification under the alpha-stable noise condition. Our goal is to discriminate orthogonal frequency division multiplexing (OFdM) modulation type from single carrier lineardigital ...
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This paperdeals with modulation classification under the alpha-stable noise condition. Our goal is to discriminate orthogonal frequency division multiplexing (OFdM) modulation type from single carrier lineardigital (SCLd) modulations in this scenario. Based on the new results concerning the generalized cyclostationarity of these signals in alpha-stable noise which are presented in this paper, we construct new modulation classification features without any priori information of carrier frequency and timing offset of the received signals, and use support vector machine (SVM) as classifier to discriminate OFdM from SCLd. Simulation results show that the recognition accuracy of the proposed algorithm can be up to 95% when the mix signal to noise ratio (MSNr) is up to ?1 dB.
In order to solve the cover source mismatch problem, a new blind universal image steganalysis algorithm combining camera source identification and outlierdetection is proposed in this paper. Cover im
ISBN:
(纸本)9781467389808
In order to solve the cover source mismatch problem, a new blind universal image steganalysis algorithm combining camera source identification and outlierdetection is proposed in this paper. Cover im
Space debris classification is significant fordebris catalog and early warning.A space debris classification method using photometric sequence obtained from ground based optical telescopes was ***,the photometric dat...
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Space debris classification is significant fordebris catalog and early warning.A space debris classification method using photometric sequence obtained from ground based optical telescopes was ***,the photometric data was analyzed and the debris size was estimated from *** 2 characteristic values could be obtained,namely the size mean value and *** motion attitude was divided into three-axis-stabilized,spin-stabilized andrandom-tumbling by frequency-domain characteristics of estimated size,and it was used as the 3 rd ***,the normalization and credibility methods were introduced to equalize 3 characteristics when constructing characteristic ***,debris was classified using maximum probably criterion with Gaussian mixture models,due to the debris’ variety of observation arcs with different *** simulation shows that success rate is more than 90% in classification of 4 kinds of debris.
data center Networks(dCNs) should provide low latency and high throughput to meet users' demands. However the coexistence of mice and elephant flows may jeopardize achieving both performance objectives simultaneou...
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data center Networks(dCNs) should provide low latency and high throughput to meet users' demands. However the coexistence of mice and elephant flows may jeopardize achieving both performance objectives simultaneously. Existing load agnostic routing techniques work well for mice flows but make elephant flows collide on the same output port, creating an avoidable bottleneck. In this paper, we present an SdN based Fast rerouting Mechanism(SFrM) forrescheduling elephant flows in a load-aware manner. An elephant flow selecting module is added into the controller to reschedule elephant flows selectively andreroutes a few elephant flows by Segment routing(Sr) technique. Simulations show that SFrM improves the network throughput andreduces the Flow Completion Time(FCT) significantly.
In order to solve the problem of the popular item ratings interfering in similarity calculation,we proposed the ratings distribution recommendation *** on this model,we designed a new collaborative filtering *** to ra...
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In order to solve the problem of the popular item ratings interfering in similarity calculation,we proposed the ratings distribution recommendation *** on this model,we designed a new collaborative filtering *** to ratings distribution,this algorithm firstly get the amount of information carried(The Shannon Entropy).Then,it calculated the rating weights to filter into traditional similarity *** experimental results show that the algorithm can effectively alleviate the above problem and improve the performance of the algorithm.
While there has been a belief over the past few years that virtual network functions(VNFs) should be built on common servers, we argue that it can lead to limited performance and large up/down traffic. This paper prop...
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While there has been a belief over the past few years that virtual network functions(VNFs) should be built on common servers, we argue that it can lead to limited performance and large up/down traffic. This paper proposes a new idea of shifting part of NFV functions from software packages to common hardware devices to promote overall performance. Then we present the design and implementation of PPAP, a Packets Processing Acceleration Platform for NFV. It offers high flexibility by allowing functions to control the processing flow of *** match tables and virtualization techniques ensure isolation among VNF instances.
As a key energy equipment of the compressed air energy storage (CAES) system, the centrifugal compressor with shroud cavity is employed to avoid the leakage flow from the rotor, especially in the high-pressure stages....
As a key energy equipment of the compressed air energy storage (CAES) system, the centrifugal compressor with shroud cavity is employed to avoid the leakage flow from the rotor, especially in the high-pressure stages. In order to clarify the leakage characteristics and its influences, the high-pressure centrifugal compressor with shroud cavity is taken as the research object in the present work. First, the leakage flow across the shroud cavity has been studied numerically, it's found that there are negative effects on the high-pressure compressor's aerodynamic performance by the shroud cavity. And then, the flow characteristics inside the shroud cavity are showed by finding several secondary flow regions and cavity vortices. In addition, through the entropy contours and streamlines, the influence on the main flow by the leakage are analysed in detail. By analysing the influence of the shroud cavity on the high-pressure compressor, this paper can provide a practical guidance for the design of the impeller in the CAES system.
Crosstalk will introduce significant carrier beating impairment in multicore fiber based IM/dd links. For PAM, CAP anddMT, experimental results show CAP format has the highest tolerance to the carrier beating impairm...
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ISBN:
(纸本)9781943580705
Crosstalk will introduce significant carrier beating impairment in multicore fiber based IM/dd links. For PAM, CAP anddMT, experimental results show CAP format has the highest tolerance to the carrier beating impairment.
Elastic control could balance the distributed control plane in Software-defined Networking(SdN). dynamic switch migration has been proposed to achieve it. However, existing schemes mainly focus on how to execute migra...
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Elastic control could balance the distributed control plane in Software-defined Networking(SdN). dynamic switch migration has been proposed to achieve it. However, existing schemes mainly focus on how to execute migration operation, but not why. This paperdesigns a decision-making mechanism based on zero-sum game theory to reelect a new controller as the master for migrated switches. It first chooses a switch for migration in the heavy controller which invites its neighbors as the game players to compete for the masterrole of this switch in the game-playing field(GPF) which is an occasional and loose domain for game-playing. Second, based on the concept of GPF, we design a decentralized strategy to play the game anddetermine which player as the final master. We implement it by extending the Open Flow protocol. Finally, numerical results demonstrate that ourdistributed strategy can approach elastic control plane with better performance.
The frequency hopping mobile ad-hoc network (FH MANET) is a communication network that combines frequency hopping (FH) technology and mobile ad-hoc network (MANET) technology. FH technology can improve the anti-interf...
The frequency hopping mobile ad-hoc network (FH MANET) is a communication network that combines frequency hopping (FH) technology and mobile ad-hoc network (MANET) technology. FH technology can improve the anti-interference performance of the network, and MANET technology improves the mobility and anti-destructiveness of the network. It can be networked autonomously without manual intervention and other network facilities. It has strong application value in complex battlefield environment and occasions with harsh environment and high confidentiality requirements. The frequency hopping pattern (FHP) design is a key technology in the FH MANET, which is directly related to the network's anti-interference and multipath fading capabilities. In this paper, a wide interval expansion method (WIEBM) based on m-sequence and non-continuous tap L-G model is proposed. The experimental results demonstrate that proposed scheme can effectively improve the anti-interference ability of the system. It has the ability to resist more than 30% of broadband interference.
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