Wang B.,Beijing Jiaotong University |
Tao D.,Beijing Jiaotong University |
Lin Z.,Beijing University of Posts and Telecommunications |
Lin Z.,Dissemination in Communication Networks Laboratory |
Lin Z.,China Mobile
2016 IEEE International Conference on Consumer Electronics-Taiwan, ICCE-TW 2016 | Year: 2016
In this paper, we integrate Hadoop onto IaaS cloud platform and propose a new Dynamic Hadoop Cluster on IaaS (DHCI) architecture. In DHCI architecture, three key modules are designed, they are monitoring module, virtual machine management module and scheduling module. The load information of both physical hosts and virtual machines are collected by the monitoring module, and can be used for designing a load feedback based resource scheduling algorithm. The basic idea of the solution is to dynamically balance the load of physical hosts and virtual machines by differentiated service. Simulation results show that our solution can balance workload and improve system performance. © 2016 IEEE.
Yizhou H.,Beijing University of Posts and Telecommunications |
Yizhou H.,Dissemination in Communication Networks Laboratory |
Gaofeng C.,Beijing University of Posts and Telecommunications |
Pengxu L.,Beijing University of Posts and Telecommunications |
And 2 more authors.
Journal of China Universities of Posts and Telecommunications | Year: 2015
Because of the integration of long term evolution (LTE) technology and mobile satellite communication systems, uplink access technology for LTE-based geo-stationary earth orbit (GEO) satellite has become a popular research topic for satellite system. In order to solve the problem of unreasonable design for physical random access channel (PRACH) signal structure and reduce the effect of time uncertainty, this paper proposes a novel random access preamble based on time pre-compensation (TPC) for LTE-Satellite (LTE-S) system. In this scheme, by applying the method of non-linear least squares, the user terminal (UT) can use the receiving power to estimate the communication round trip delay (RTD) and based on the transmission delay of the beam center and the satellite, RTD can be compensated before transmission. Therefore, the preamble length and duration can be reduced without related to the maximum of RTD. In order to verify the performance of the scheme, the MATLAB is used to build a test system. The simulation results show that the proposed preamble satisfies the requirements of LTE-S system, and the better performance than previous researches is obtained. © 2015 The Journal of China Universities of Posts and Telecommunications.
Bai Y.,Beihang University |
Bai Y.,Dissemination in Communication Networks Laboratory |
Huang J.,Michigan State University
IEICE Transactions on Communications | Year: 2010
Data query is one of the most important issues in wireless ad hoc networks, since the ultimate goal of these networks is to support efficient data sharing among wireless nodes. In this paper, we study the issue of data query for delay-sensitive applications in dense wireless ad hoc networks. We focus our attention on step-by-step expanding ring-based data query, which provides an upper bound on query delay to any expanding ring based query strategies. Two replication strategies including Index Replication (IR) and Data Replication (DR) are considered, to improve the delay performance of data query. We analyze the probabilistic behavior of query delay for both DR and IR by theoretical methods, and develop analytical models to approximate the minimum number of replicas required for both query strategies if an application-specified delay bound is imposed. Our work is validated through extensive simulations. Copyright © 2010.
Du N.,Beihang University |
Bai Y.,Beihang University |
Luo L.,Dissemination in Communication Networks Laboratory |
Luo L.,China Electronics Technology Group Corporation |
And 4 more authors.
Proceedings of the International Conference on Parallel and Distributed Systems - ICPADS | Year: 2011
Tactical communication networking faces complexity, heterogeneity, and reliability requirements. The emerging research area of cognitive networks offers a potential for dealing with these problems. A key feature of cognitive networks is the knowledge base, which is produced during the process of learning and responsible for the decision making. We propose a cognitive network model integrated with the knowledge base, which is a primary part of cognitive networks. And then we focus on the construction of the knowledge base and the expression form of the knowledge in the model. In this paper, we use the Bayesian Network (BN) to construct the knowledge base, which is a unique tool for creating a representation of the dependence relationships among network protocol parameters. The data structure of the dependence relationships of the BN is translated into the knowledge which is expressed by the probability. In the simulation experiments, we create the BN through the sampling data to construct the knowledge base using the mathematical tool MATLAB and prove the efficiency of our cognitive network model for optimizing network performance in the OPENT simulation platform. © 2011 IEEE.
Bai Y.-B.,Beihang University |
Bai Y.-B.,Dissemination in Communication Networks Laboratory |
Zhu X.,Beihang University |
Shao X.,Institute for Infocomm Research |
Yang W.-T.,Beihang University
Mobile Networks and Applications | Year: 2012
Mobile Ad Hoc Networks (MANETs) have inherently dynamic topologies and heterogeneous network environments. Due to the distributed, multi-hop nature of these networks, as well as limited network resource, wireless capacity and random mobility of nodes, Quality of Service (QoS) provisioning faces severe challenges, especially in multicast scenarios. Resource admission control is one of the most effective methods for resource utilization and QoS guaranteed. In this paper, we combine resource admission control technologies and intelligent methods, propose a fuzzy decision-based resource admission control mechanism for MANETs (FAST), which can fast respond to dynamic topology changes and unstable link status. FAST also supports multicast and destination heterogeneity. Users can choose multiple evaluation parameters with different weights of services in fuzzy decision. Simulation results have proved the efficiency of the mechanism. © Springer Science+Business Media, LLC 2012.
Wang J.,China Electronics Technology Group Corporation |
Wang J.,Dissemination in Communication Networks Laboratory |
He Z.,China Electronics Technology Group Corporation |
Xu Z.,Unit 96275
WIT Transactions on Information and Communication Technologies | Year: 2014
In order to improve the jamming identification performance in fading channels, a cooperative jamming identification algorithm was proposed in this paper. The jamming signal was detected and identified in each node, and then the identification information was sent to the selected center node. The identification information was amalgamated at the center node. Simulation results show that the proposed cooperative jamming identification can improve the detection probability and the miss probability. © 2014 WIT Press.
Bai L.,Xidian University |
Gu H.,Dissemination in Communication Networks Laboratory |
Yang Y.,Xidian University |
Wang K.,Xidian University
IEICE Electronics Express | Year: 2012
Optical network-on-chip (ONoC) has been proposed to provide higher bandwidth and lower power consumption for future mul-ticore systems. However, due to the intrinsic characteristic of optical devices, crosstalk noise is a potential issue for ONoC. The traditional routing algorithms for Benes ONoC have not considered the aspect of crosstalk. In this paper, we build the crosstalk model of the optical switch and analyze the crosstalk noise, signal-to-noise-ratio (SNR) and bit-error-rate (BER) for Benes ONoC. Moreover, we propose a routing algorithm to relieve the crosstalk problem. Simulation results verify the effectiveness of the algorithm compared to the conventional alternatives. © IEICE 2012.
Feng T.,University of Electronic Science and Technology of China |
Zhang X.,University of Electronic Science and Technology of China |
Tang W.,University of Electronic Science and Technology of China |
Wang J.,University of Electronic Science and Technology of China |
Guo Y.,Dissemination in Communication Networks Laboratory
2014 Australasian Telecommunication Networks and Applications Conference, ATNAC 2014 | Year: 2015
Cooperative relaying technology has been proved to be one of the most promising techniques to improve the throughput of CR networks. In this paper, cognitive relay networks with amplify-and-forward (AF) protocol in a spectrumsharing scenario have been considered. Compared with previous studies, we further consider the transmit power constraint on secondary source node (SS). Namely, we impose both transmit power constraint and interference power constraint on SS and secondary relay node (SR). As well we obtain the exact outage probability which works as the performance measurement of CR networks. To analyze the influential factors for system performance, the closed form expression of outage probability needs to be derived. However, it is mathematical intractable. Hence, an approximate approach is adopted as a solution. Finally, Monte-Carlo simulations are conducted to verify the accuracy of our approximation, the error sources of our analytical results are discussed as well. © 2014 IEEE.
Zhang S.,National University of Defense Technology |
Zhang S.,Dissemination in Communication Networks Laboratory |
Hafid A.,University of Montréal |
Zhao H.,National University of Defense Technology |
And 2 more authors.
IEEE International Conference on Communications | Year: 2015
From cross-layer perspective, the impact of imperfect spectrum sensing and access contention on the cooperative sensing in cognitive radio networks is investigated in the context of the tradeoff between interferences to PUs and aggregated secondary throughput. Jointly considering imperfect spectrum sensing and access contention, we reformulate the sensing-throughput tradeoff problem via taking the interference probability, rather than the detection probability, as the optimization constraint, and further obtain the optimal combination of fusion rule, sensing duration and detection threshold to maximize the secondary throughput under the interference probability constraint. Numerical results show that the proposed cross-layer method can improve the secondary throughput performance significantly, especially in the case of low signal-to-noise ratio. © 2015 IEEE.
Sun Z.,Harbin Engineering University |
Sun Z.,Dissemination in Communication Networks Laboratory |
Ning X.,Harbin Engineering University |
Hu J.,Harbin Engineering University |
Wang X.,Harbin Engineering University
2014 International Conference on Mechatronics, Electronic, Industrial and Control Engineering, MEIC 2014 | Year: 2014
In order to increase bandwidth efficiency of band limited communication system, a new multi-band digital modulation scheme based on Quaternary Carrier Orthogonal Sinusoidal Non-linear Chirp Keying (QCO-SNCK) is proposed. Firstly, by analyzing the orthogonality of SNCK modulated waveform samples, 4 mutually orthogonal waveform samples are selected as a set of new orthogonal subcarriers. Secondly, by using coherent demodulation method in the receiver, the quaternary wireless digital communication system has been achieved. Then the MATLAB software simulation platform is built to analysis the performance of the QCO-SNCK system. Theoretical and simulation results show that: when the communication channel bandwidth is limited, the bandwidth efficiency of QCO-SNCK system is 2 times wider than that of SNCK. Compared with Quadrature Phase Shift Keying (QPSK), the bandwidth efficiency of QCO-SNCK system has adjustable performance and higher flexibility. In addition, QCO-SNCK system has a strong ability of resisting Doppler frequency shift (DFS) which can be applied to wireless communication system with high rate mobile communication terminals. © 2014. The authors - Published by Atlantis Press.