Báo cáo hóa học: " An orthogonal spectrum sharing scheme for wireless sensor networks" potx

... Ting1, Yang Han1and Ashish Pandharipande2AbstractIt is not economically viable to allocate a dedicated spectrum band to wireless sensor networks (WSNs). Moreover, sharing a spectrum band wi ... et al.: An orthogonal spectrum sharing scheme for wireless sensor networks. EURASIP Journal on Wireless Communications and Networking 2011 2011:10.Submit your manuscript to a journal and beneﬁ ... propose an orthogonal spectrum sharing scheme (OSSS) which allowsaWSNtogainspectrumaccess along with a primary system without causing anyinterference to one another. As a result, the perfor-mance...

Báo cáo hóa học: " Editorial Physical-Layer Network Coding for Wireless Cooperative Networks" pot

... least partial channel informationof present channel estimation algorithms for two-way relaychannels. Both exploit the nature of reciprocal channels andboth consider OFDM transmission strategies, ... exploitingthe broadcast nature of wireless radio waveform so thatthe overall system performance including power eﬃciencyand communication reliability can be signiﬁcantly improved.However, due to ... issues, joint synchroniza-tion, modulation, channel coding and PLNC, combinedPLNC and diversity and multiplexing techniques, and c ross-layer design and optimization.In this special issue, we...

Báo cáo hóa học: " Research Article Adaptive Power Allocation in Wireless Sensor Networks with Spatially Correlated Data and Analog Modulation: Perfect and Imperfect CSI Muhammad Hafeez Chaudhary and Luc Vandendorpe" pptx

... performance gain compared to a uniform power allocation scheme. 1. Introduction Wireless sensor networking is an emerging technology whichfinds application in many fields including environmentand ... monitoring and surveillance,and underwater wireless sensor networks (UWSNs) for marine environment monitoring [1, 2]. A wireless sensor network (WSN) consists of spatially distributed sensors thatcooperatively ... Cui, and A. J. Goldsmith, “Power-efficient analog forwarding transmission in an inhomoge-neous gaussian sensor network,” in Proceedings of the 6thIEEE Workshop on Signal Processing Advances in Wireless 14...

Báo cáo hóa học: " Research Article Collaborative Area Monitoring Using Wireless Sensor Networks with Stationary and Mobile Nodes" docx

... Calif, USA, September 2003.[8] F. Zhao and L. Guibas, Wireless Sensor Networks: An Informa-tion Processing Approach, chapter 2, Morgan Kaufmann, SanFrancisco, Calif, USA, 2004.[9] K. Passino, ... fromx(k) and are within an angle θ− φ and θ + φ as shownin Figure 2. Note that the parameters ρ and φ can be usedto also model the maneuverability constraints of the mobileplatform. At the ... usingvarious sensor ﬁelds with randomly deployed sensor nodes.Section 6 reviews related work in two research ﬁelds, the areacoverage for both stationary and mobile sensor networks andthe path planning...

Báo cáo hóa học: " Research Article Range-Based Localization for UWB Sensor Networks in Realistic Environments" pdf

... Ultra-Wideband (UWB) sensor networks is an important area that attracts signiﬁcantresearch interest. It is required in many sensor networkapplications, such as indoor navigation and surveillance,detection ... ﬁgure, we cansee that the HT and HC methods provide better performancethan other methods. The HC method, a combination ofthe HT and the CT method, can further improve theperformance of the ... network.The performance of all methods was examined depending onthe number of LOS nodes among these eight nodes.From Figure 6, one can see that HC and HT methodsperform better than AML and RW for all...

Báo cáo hóa học: " Research Article Distributed Time Synchronization in Wireless Sensor Networks with Coupled Discrete-Time Oscillators" pptx

... convergence cannot be guaranteed for allvalues of 0 <ε<1and0<μ<1. We refer to Appendix C for further analysis on this point. Here, we illustrate this is-sue by means of an example. ... and μthat guarantee the condition|λ(λ, μ)| < 1foranyλ in (C.4)(except λ= 1).However,anumericalstudycanbeeasilycar-ried out from (C.3)and(C.4). For illustration, consider an undirected ... coeﬃcient, that isa zero-mean and unit-power complex (circularly symmetric)Gaussian random variable with|βki|2= Gki;andw(n, m)isthe additive Gaussian noise with zero mean and power N0.Notice...

Báo cáo hóa học: " Research Article Hop-Distance Estimation in Wireless Sensor Networks with Applications to Resources Allocation Liang Zhao and Qilian Liang" pot

... Rome,Italy, July 2001.[8] M. Zorzi and R. R. Rao, “Geographic random forwarding(GeRaF) for ad hoc and sensor networks: multihop perfor-mance,” IEEE Transactions on Mobile Computing, vol. ... under the sensor networks cir-cumstances in [12], and gave the mean and variance of mul-tihop distance for 1D Poisson point distribution. They alsoproposed to approximate the multihop distance ... of the Eu-clidean distance to the network distance,γ= mini, j∈Vd(i, j)h(i, j),(1)where d(i, j)andh(i, j) are the Euclidean distance and net-work distance between nodes i and j,respectively.Thecon-stant...

Báo cáo hóa học: " Error Control Coding in Low-Power Wireless Sensor Networks: When Is ECC Energy-Efﬁcient?" potx

... Professor Alex Grant. He received a 1997 CareerAward, and a Canada Research Chair in 2001. He is an AssociateEditor for coding theory and techniques for IEEE Transactions onCommunications, and a Guest ... dis-tances at various frequencies and environments. Path lossexponents range from n= 2 for free space to n = 4for office space with many obstacles and ranging over multiplefloors. Both hig h and ... such as for- est or foliated urban/suburban locations; and n= 4asaninterior environment with many obstructions and possiblymultiple floors, or a dense urban environment. A frequencyrange from...

Báo cáo hóa học: "Research Article Spectrum Sharing in an ISM Band: Outage Performance of a Hybrid DS/FH Spread Spectrum System with Beamforming" docx

... ongoing eﬀort to develop an analytical framework for interference modeling and performance evaluation inthe unlicensed band, as it is seen as an invaluable tool for dynamic spectrum access system ... bandwidth, and limited transmissionrange [8]. In an interference rich scenario such as ISMband, beamforming is expected to play an important role.Beamforming uses arrays of antennas to control ... to analyze thesystem performance using beamforming. Numerical results show that beamforming signiﬁcantly improves the system outageperformance. The work presented in this paper provides a quantitative...

báo cáo hóa học:" An interactive surgical planning tool for acetabular fractures: initial results" doc

... approach was planned and executed i nfive cases and an ilioinguinal approach in one case. Inone case a combined Stoppa and posterior approachwas planned and executed (Table 2). The planned frac-ture ... CTand preoperative planning showing the osteosynthesisimplants as planned (blue) and as executed (orange). Obliquelateral view.Fornaro et al. Journal of Orthopaedic Surgery and Research 2010, ... osteosynthes isimplants as well as bending and torsion angles offixation plate segments in all three planes. The surgeon(M.K.) used this information to manually con tour osteo-synthesis implants preoperat...

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