16.7.5.5.2 Sensor Networks

Chapter Contents (Back)
Sensor Networks. Generally not image based, general sensors.

Kundur, D., Luh, W., Okorafor, U.N., Zourntos, T.,
Security and Privacy for Distributed Multimedia Sensor Networks,
PIEEE(96), No. 1, January 2008, pp. 112-130.
IEEE DOI 0804
BibRef

Czarlinska, A.[Alexandra], Luh, W.[William], Kundur, D.[Deepa],
On privacy and security in distributed visual sensor networks,
ICIP08(1692-1695).
IEEE DOI 0810
BibRef

Fu, Y., Tian, Z.,
Cramer-Rao Bounds for Hybrid TOA/DOA-Based Location Estimation in Sensor Networks,
SPLetters(16), No. 8, August 2009, pp. 655-658.
IEEE DOI 0906
Time/direction of arrival. BibRef

Umer, M.[Muhammad], Kulik, L.[Lars], Tanin, E.[Egemen],
Spatial interpolation in wireless sensor networks: Localized algorithms for variogram modeling and Kriging,
GeoInfo(14), No. 1, January 2010, pp. xx-yy.
Springer DOI 1001
BibRef

Akyildiz, I.F., Melodia, T., Chowdhury, K.R.,
Wireless Multimedia Sensor Networks: Applications and Testbeds,
PIEEE(96), No. 10, October 2008, pp. 1588-1605.
IEEE DOI 0811
BibRef

Dai, R.[Rui], Akyildiz, I.F.,
A Spatial Correlation Model for Visual Information in Wireless Multimedia Sensor Networks,
MultMed(11), No. 6, October 2009, pp. 1148-1159.
IEEE DOI 0909
BibRef

Wang, P.[Pu], Dai, R.[Rui], Akyildiz, I.F.,
A Spatial Correlation-Based Image Compression Framework for Wireless Multimedia Sensor Networks,
MultMed(13), No. 2, 2011, pp. 388-401.
IEEE DOI 1103
BibRef

Dai, R.[Rui], Wang, P.[Pu], Akyildiz, I.F.,
Correlation-Aware QoS Routing With Differential Coding for Wireless Video Sensor Networks,
MultMed(14), No. 5, 2012, pp. 1469-1479.
IEEE DOI 1210
BibRef

Wang, P., Dai, R., Akyildiz, I.F.,
A Differential Coding-Based Scheduling Framework for Wireless Multimedia Sensor Networks,
MultMed(15), No. 3, 2013, pp. 684-697.
IEEE DOI 1303
BibRef

Umer, M.[Muhammad], Tanin, E.[Egemen], Kulik, L.[Lars],
Opportunistic sampling-based query processing in wireless sensor networks,
GeoInfo(17), No. 4, October 2013, pp. 567-597.
WWW Link. 1309
BibRef

Djenouri, D.,
R4-Syn: Relative Referenceless Receiver/Receiver Time Synchronization in Wireless Sensor Networks,
SPLetters(19), No. 4, April 2012, pp. 175-178.
IEEE DOI 1203
BibRef

Fortino, G., Giannantonio, R., Gravina, R., Kuryloski, P., Jafari, R.,
Enabling Effective Programming and Flexible Management of Efficient Body Sensor Network Applications,
HMS(43), No. 1, January 2013, pp. 115-133.
IEEE DOI 1301
BibRef

Zachariah, D., de Angelis, A., Dwivedi, S., Handel, P.,
Self-Localization of Asynchronous Wireless Nodes With Parameter Uncertainties,
SPLetters(20), No. 6, 2013, pp. 551-554.
IEEE DOI maximum likelihood estimation; Cramer-Rao bound; maximum a posteriori estimators; wireless sensor networks 1307
BibRef

Esch, J.,
A Survey on Topology Control in Wireless Sensor Networks: Taxonomy, Comparative Study, and Open Issues,
PIEEE(101), No. 12, December 2013, pp. 2534-2537.
IEEE DOI 1402
Intro to the article. telecommunication control BibRef

Meng, W., Xie, L., Xiao, W.,
Decentralized TDOA Sensor Pairing in Multihop Wireless Sensor Networks,
SPLetters(20), No. 2, February 2013, pp. 181-184.
IEEE DOI 1302
TODA: time-difference-of-arrival BibRef

Kim, W., Park, J., Yoo, J., Kim, H.J., Park, C.G.,
Target Localization Using Ensemble Support Vector Regression in Wireless Sensor Networks,
Cyber(43), No. 4, 2013, pp. 1189-1198.
IEEE DOI 1307
Acoustics BibRef

Li, M.[Mo], Li, Z.J.[Zhen-Jiang], Vasilakos, A.V.,
A Survey on Topology Control in Wireless Sensor Networks: Taxonomy, Comparative Study, and Open Issues,
PIEEE(101), No. 12, December 2013, pp. 2538-2557.
IEEE DOI 1402
telecommunication congestion control BibRef

Zhu, Y.[Ye], Vikram, A., Fu, H.[Huirong],
On Topology of Sensor Networks Deployed for Multitarget Tracking,
ITS(15), No. 4, August 2014, pp. 1489-1498.
IEEE DOI 1410
blind source separation BibRef

Manoj, C., Jagannatham, A.K.,
Optimal Prediction Likelihood Tree Based Source-Channel ML Decoder for Wireless Sensor Networks,
SPLetters(21), No. 2, February 2014, pp. 135-139.
IEEE DOI 1402
Viterbi decoding BibRef

Go, S.[Seungryeol], Chong, J.W.[Jong-Wha],
Improved TOA-Based Localization Method with BS Selection Scheme for Wireless Sensor Networks,
ETRI(37), No. 4, August 2015, pp. 707-716.
DOI Link 1511
BibRef

Bouchoucha, T., Ahmed, M.F.A., Al-Naffouri, T.Y., Alouini, M.S.,
Distributed Estimation Based on Observations Prediction in Wireless Sensor Networks,
SPLetters(22), No. 10, October 2015, pp. 1530-1533.
IEEE DOI 1506
mean square error methods BibRef

Wu, S.C.[Shao-Chuan], Liu, B.[Bo], Bai, X.[Xu], Hou, Y.G.[Yu-Guan],
Eavesdropping-Based Gossip Algorithms for Distributed Consensus in Wireless Sensor Networks,
SPLetters(22), No. 9, September 2015, pp. 1388-1391.
IEEE DOI 1503
broadcast communication BibRef

Safavi, S.[Sam], Khan, U.A.[Usman A.],
Leader-Follower Consensus in Mobile Sensor Networks,
SPLetters(22), No. 12, December 2015, pp. 2249-2253.
IEEE DOI 1512
information dissemination BibRef

Venkategowda, N.K.D., Jagannatham, A.K.,
Optimal Minimum Variance Distortionless Precoding (MVDP) for Decentralized Estimation in MIMO Wireless Sensor Networks,
SPLetters(22), No. 6, June 2015, pp. 696-700.
IEEE DOI 1411
Bismuth BibRef

Venkategowda, N.K.D., Narayana, B.B., Jagannatham, A.K.,
Precoding for Robust Decentralized Estimation in Coherent-MAC-Based Wireless Sensor Networks,
SPLetters(24), No. 2, February 2017, pp. 240-244.
IEEE DOI 1702
Channel estimation BibRef

de la Hucha Arce, F., Rosas, F., Moonen, M., Verhelst, M., Bertrand, A.,
Generalized Signal Utility for LMMSE Signal Estimation With Application to Greedy Quantization in Wireless Sensor Networks,
SPLetters(23), No. 9, September 2016, pp. 1202-1206.
IEEE DOI 1609
least mean squares methods BibRef

Nadas, J.P.B., Souza, R.D., Pellenz, M.E., Brante, G., Braga, S.M.,
Energy Efficient Beacon Based Synchronization for Alarm Driven Wireless Sensor Networks,
SPLetters(23), No. 3, March 2016, pp. 336-340.
IEEE DOI 1603
energy conservation BibRef

Moon, J., Basar, T.,
Static Optimal Sensor Selection via Linear Integer Programming: The Orthogonal Case,
SPLetters(24), No. 7, July 2017, pp. 953-957.
IEEE DOI 1706
Cost function, Estimation, Lips, Moon, Robot sensing systems, Signal processing algorithms, Linear integer program (LIP), mean-squared estimation, sensor, selection BibRef

Wang, S., Luo, F., Zhang, L.,
Universal Cooperative Localizer for WSN With Varied Types of Ranging Measurements,
SPLetters(24), No. 8, August 2017, pp. 1223-1227.
IEEE DOI 1708
computational complexity, cooperative communication, sampling methods, wireless sensor networks, Doppler frequency, angle-of-arrival, belief propagation localizer, computational complexity, generalized approximate message passing, localization problem, radio signal strength, ranging measurements, time-of-arrival, universal cooperative localizer, Additives, Distance measurement, Doppler effect, Frequency measurement, Pollution measurement, Probability density function, Wireless sensor networks, Approximate message passing, cooperative localization, BibRef

Doostmohammadian, M., Rabiee, H.R., Zarrabi, H., Khan, U.A.,
Distributed Estimation Recovery Under Sensor Failure,
SPLetters(24), No. 10, October 2017, pp. 1532-1536.
IEEE DOI 1710
graph theory, observability, sensor fusion, consensus iterations, distributed estimation recovery, BibRef

Tsinos, C.G., Ottersten, B.,
An Efficient Algorithm for Unit-Modulus Quadratic Programs With Application in Beamforming for Wireless Sensor Networks,
SPLetters(25), No. 2, February 2018, pp. 169-173.
IEEE DOI 1802
array signal processing, computational complexity, convex programming, quadratic programming, wireless sensor networks (WSNs) BibRef

Kyrkou, C., Christoforou, E.G., Timotheou, S., Theocharides, T., Panayiotou, C., Polycarpou, M.,
Optimizing the Detection Performance of Smart Camera Networks Through a Probabilistic Image-Based Model,
CirSysVideo(28), No. 5, May 2018, pp. 1197-1211.
IEEE DOI 1805
Decision making, Monitoring, Optimization, Probabilistic logic, Smart cameras, Uncertainty, Active vision, dynamic reconfiguration, smart camera networks (SCNs) BibRef

Kyrkou, C.[Christos],
YOLOpeds: Efficient Real-Time Single-Shot Pedestrian Detection for Smart Camera Applications,
IET-CV(14), No. 7, October 2020, pp. 417-425.
DOI Link 2010
BibRef

Li, Y., Jha, D.K., Ray, A., Wettergren, T.A.,
Information-Theoretic Performance Analysis of Sensor Networks via Markov Modeling of Time Series Data,
Cyber(48), No. 6, June 2018, pp. 1898-1909.
IEEE DOI 1805
Algorithm design and analysis, Analytical models, Markov processes, Object detection, Sensor fusion, target detection BibRef

Buehrer, R.M., Wymeersch, H., Vaghefi, R.M.,
Collaborative Sensor Network Localization: Algorithms and Practical Issues,
PIEEE(106), No. 6, June 2018, pp. 1089-1114.
IEEE DOI 1806
5G mobile communication, Collaboration, Distance measurement, Estimation, Global Positioning System, Position measurement, sensor networks BibRef

Doostmohammadian, M., Rabiee, H.R., Khan, U.A.,
Structural Cost-Optimal Design of Sensor Networks for Distributed Estimation,
SPLetters(25), No. 6, June 2018, pp. 793-797.
IEEE DOI 1806
combinatorial mathematics, computational complexity, large-scale systems, observability, optimisation, system digraph BibRef

Alam, M.S., Kaddoum, G., Agba, B.L.,
Performance Analysis of Distributed Wireless Sensor Networks for Gaussian Source Estimation in the Presence of Impulsive Noise,
SPLetters(25), No. 6, June 2018, pp. 803-807.
IEEE DOI 1806
Bayes methods, Gaussian noise, Rayleigh channels, fading channels, impulse noise, least mean squares methods, Rayleigh fading BibRef

Fort, E.H.[E. Hidalgo], Oya, J.R.G.[J. R. García], Chavero, F.M.[F. Muñoz], Carvajal, R.G.[R. González],
Intelligent Containers Based on a Low-Power Sensor Network and a Non-Invasive Acquisition System for Management and Tracking of Goods,
ITS(19), No. 8, August 2018, pp. 2734-2738.
IEEE DOI 1808
Containers, Monitoring, Acoustics, Temperature sensors, Wireless networks, Ultrasonic imaging, Intelligent containers, wireless sensor networks BibRef

Chang, C., Chin, Y., Chen, C., Chang, C.,
Impasse-Aware Node Placement Mechanism for Wireless Sensor Networks,
SMCS(48), No. 8, August 2018, pp. 1225-1237.
IEEE DOI 1808
Robot sensing systems, Wireless sensor networks, Surveillance, Hardware, Mobile communication, Coverage, dead-end, impasse, wireless sensor network (WSN) BibRef

Liao, C., Ting, C.,
A Novel Integer-Coded Memetic Algorithm for the Set-k-Cover Problem in Wireless Sensor Networks,
Cyber(48), No. 8, August 2018, pp. 2245-2258.
IEEE DOI 1808
Sensors, Wireless sensor networks, Genetic algorithms, Memetics, Algorithm design and analysis, Recycling, Sociology, wireless sensor networks (WSNs) BibRef

Goel, A., Patel, A., Nagananda, K.G., Varshney, P.K.,
Robustness of the Counting Rule for Distributed Detection in Wireless Sensor Networks,
SPLetters(25), No. 8, August 2018, pp. 1191-1195.
IEEE DOI 1808
electromagnetic wave attenuation, energy conservation, radiofrequency interference, sensor fusion, sensitivity BibRef

Zhang, M.Y.[Meng-Yi], Goupil, A.[Alban], Hanaf, A.[Anas], Wang, T.[Tian],
Distributed Harmonic Form Computation,
SPLetters(25), No. 8, August 2018, pp. 1241-1245.
IEEE DOI 1808
graph theory, Laplace equations, signal processing, central control center, distributed harmonic, simplicial complex BibRef

Wang, X.Q.[Xue-Qian], Li, G.[Gang], Varshney, P.K.[Pramod K.],
Detection of Sparse Signals in Sensor Networks via Locally Most Powerful Tests,
SPLetters(25), No. 9, September 2018, pp. 1418-1422.
IEEE DOI 1809
Gaussian distribution, iterative methods, sensor fusion, signal detection, stochastic processes, wireless sensor networks, sparse signals BibRef

Li, C., Li, G.[Gang], Varshney, P.K.[Pramod K.],
Distributed Detection of Sparse Signals With Censoring Sensors Via Locally Most Powerful Test,
SPLetters(27), 2020, pp. 346-350.
IEEE DOI 2004
Censoring sensors, distributed detection, energy constraints, locally most powerful tests, sparse signals BibRef

Special Issue on Large-scale Visual Sensor Networks: Architectures and Applications,
CirSysVideo(28), No. 12, December 2018, pp. 3550-3551.
IEEE DOI 1812
BibRef

Huang, M., Liu, A., Xiong, N.N., Wang, T., Vasilakos, A.V.,
A Low-Latency Communication Scheme for Mobile Wireless Sensor Control Systems,
SMCS(49), No. 2, February 2019, pp. 317-332.
IEEE DOI 1901
Delays, Relays, Wireless sensor networks, Energy consumption, Mobile nodes, Communication delay, duty cycles, mobile wireless sensor networks (MWSNs) BibRef

Li, L., Yu, D., Xia, Y., Yang, H.,
Remote Nonlinear State Estimation With Stochastic Event-Triggered Sensor Schedule,
Cyber(49), No. 3, March 2019, pp. 734-745.
IEEE DOI 1902
State estimation, Schedules, Data communication, Wireless sensor networks, Nonlinear systems, unscented Kalman filter (UKF) BibRef

Meng, X.L.[Xiang-Li], Wu, L.D.[Ling-Da], Yu, S.B.[Shao-Bo],
Research on Resource Allocation Method of Space Information Networks Based on Deep Reinforcement Learning,
RS(11), No. 4, 2019, pp. xx-yy.
DOI Link 1903
BibRef

Wei, L.[Linna], Song, X.X.[Xiao-Xiao], Zheng, X.[Xiao], Wu, X.G.[Xuan-Gou], Gui, G.[Guan],
Boundary Node Identification in Three Dimensional Wireless Sensor Networks for Surface Coverage,
IEICE(E102-D), No. 6, June 2019, pp. 1126-1135.
WWW Link. 1906
BibRef

Guo, Y.D.[Yun-Di], Zou, B.J.[Bei-Ji], Ren, J.[Ju], Liu, Q.Q.[Qing-Qing], Zhang, D.Y.[De-Yu], Zhang, Y.X.[Yao-Xue],
Distributed and Efficient Object Detection via Interactions Among Devices, Edge, and Cloud,
MultMed(21), No. 11, November 2019, pp. 2903-2915.
IEEE DOI 1911
Object detection, Image edge detection, Image coding, Servers, Cloud computing, Edge computing, Real-time systems, wireless surveillance applications BibRef

Haque, M.E.[M. Ershadul], Asikuzzaman, M., Khan, I.U.[Imran Ullah], Ra, I.H.[In-Ho], Hossain, M.S.[M. Sanwar], Shah, S.B.H.[Syed Bilal Hussain],
Comparative Study of IoT-Based Topology Maintenance Protocol in a Wireless Sensor Network for Structural Health Monitoring,
RS(12), No. 15, 2020, pp. xx-yy.
DOI Link 2008
BibRef

Rahman, G.M.E.[Gazi M. E.], Wahid, K.A.[Khan A.],
LDAP: Lightweight Dynamic Auto-Reconfigurable Protocol in an IoT-Enabled WSN for Wide-Area Remote Monitoring,
RS(12), No. 19, 2020, pp. xx-yy.
DOI Link 2010
BibRef

Yan, Y.J.[Yi-Jun], Liu, Y.G.[Yi-Guang], Yang, M.Q.A.[Ming-Qi-Ang], Zhao, H.M.[Hui-Min], Chai, Y.M.[Yan-Mei], Ren, J.C.[Jin-Chang],
Generic wavelet-based image decomposition and reconstruction framework for multi-modal data analysis in smart camera applications,
IET-CV(14), No. 7, October 2020, pp. 471-479.
DOI Link 2010
BibRef

Liang, Z., Cai, J., Cao, Z., Zhang, L.,
CameraNet: A Two-Stage Framework for Effective Camera ISP Learning,
IP(30), 2021, pp. 2248-2262.
IEEE DOI 2102
cameras, computerised instrumentation, convolutional neural nets, image colour analysis, image enhancement, image reconstruction, convolutional neural networks BibRef

Njila, R.C.N.[Roger Cesarié Ntankouo], Mostafavi, M.A.[Mir Abolfazl], Brodeur, J.[Jean],
A Decentralized Semantic Reasoning Approach for the Detection and Representation of Continuous Spatial Dynamic Phenomena in Wireless Sensor Networks,
IJGI(10), No. 3, 2021, pp. xx-yy.
DOI Link 2104
BibRef

Cui, L., Su, D., Zhou, Y., Zhang, L., Wu, Y., Chen, S.,
Edge Learning for Surveillance Video Uploading Sharing in Public Transport Systems,
ITS(22), No. 4, April 2021, pp. 2274-2285.
IEEE DOI 2104
Streaming media, Delays, Surveillance, Bandwidth, Harmonic analysis, Servers, Transportation, Video uploading, bus, AP placement, transportation BibRef

Patra, R.K.[Rajen Kumar], Dhar, A.S.[Anindya Sundar],
A Novel Nested Array for Real-Valued Sources Exploiting Array Motion,
SPLetters(28), 2021, pp. 1375-1379.
IEEE DOI 2107
Sensor arrays, Sensors, Array signal processing, Manifolds, Multiple signal classification, Simulation, Narrowband, sum difference coarray BibRef

Patra, R.K.[Rajen Kumar], Dhar, A.S.[Anindya Sundar],
Novel Moving Coprime Array Configurations for Real-Valued Sources,
SPLetters(29), 2022, pp. 657-661.
IEEE DOI 2203
Sensor arrays, Sensors, Principal component analysis, Array signal processing, Covariance matrices, Soft sensors, moving array BibRef

Lee, J.Y.[Jong-Yong], Lee, D.S.[Dae-Sung],
Cluster-based WSN protocol that improves network lifetime through CH replacement,
IJCVR(11), No. 6, 2021, pp. 605-615.
DOI Link 2111
Sensor nodes in wireless sensor networks. Energy consumption issues. BibRef

Yoon, Y.[Yourim], Kim, Y.H.[Yong-Hyuk],
Maximizing the Coverage of Sensor Deployments Using a Memetic Algorithm and Fast Coverage Estimation,
Cyber(52), No. 7, July 2022, pp. 6531-6542.
IEEE DOI 2207
Sensors, Genetic algorithms, Wireless sensor networks, Search problems, Memetics, Monitoring, Mathematical analysis, sensor deployment BibRef

Ma, D.Z.[Da-Zhong], Li, Y.[Yunbo], Hu, X.G.[Xu-Guang], Zhang, H.G.[Hua-Guang], Xie, X.P.[Xiang-Peng],
An Optimal Three-Dimensional Drone Layout Method for Maximum Signal Coverage and Minimum Interference in Complex Pipeline Networks,
Cyber(52), No. 7, July 2022, pp. 5897-5907.
IEEE DOI 2207
Drones, Pipelines, Interference, Solid modeling, Layout, Linear programming, Local area networks, two-phase evolution BibRef

Dong, X.X.[Xiang-Xiang], Battistelli, G.[Giorgio], Chisci, L.G.[Lui-Gi], Cai, Y.Z.[Yun-Ze],
An Event-Triggered Hybrid Consensus Filter for Distributed Sensor Network,
SPLetters(29), 2022, pp. 1472-1476.
IEEE DOI 2207
Information filters, Current measurement, Filtering theory, Loss measurement, Filtering algorithms, Data communication, Kullback-Leibler divergence BibRef

Babaoglu, T.S., Baltaci, I.T., Pehlivan, H.,
Development of a Location-Based Mobile Application for Smartphones Using Open-Source Technologies,
SmartCityApp21(79-82).
DOI Link 2201
BibRef

Yang, Z.[Zhen], Wu, D.[Di], Li, T.[Tong], Feng, W.[Weite], Tu, S.S.[Shan-Shan],
A Multi-objective Cluster Head Selection Optimization Algorithm for Industrial Wireless Sensor Networks,
ICIVC21(445-452)
IEEE DOI 2112
Wireless sensor networks, Energy consumption, Head, Protocols, Clustering algorithms, Evolutionary computation, Cluster head selection BibRef

Zhang, K.[Kun], Wang, Y.[Yubo], Ning, Z.[Zhenhu],
Certificateless Peer-to-Peer Key Agreement Protocol for the Perception Layer of Internet of Things,
ICIVC21(436-440)
IEEE DOI 2112
Performance evaluation, Trusted computing, Protocols, Costs, Public key, Reliability engineering, Sensors, key agreement, certificateless BibRef

Hou, Q.B.[Qi-Bin], Zhou, D.Q.[Da-Quan], Feng, J.S.[Jia-Shi],
Coordinate Attention for Efficient Mobile Network Design,
CVPR21(13708-13717)
IEEE DOI 2111
Image segmentation, Tensors, Computational modeling, Semantics, Object detection, Transforms BibRef

Messabih, H., Ayad, S., Terrissa, L.S.,
Context Aware for Internet of Things: A Survey,
ISCV20(1-7)
IEEE DOI 2011
data analysis, Internet of Things, sensors deployment, con-aware paradigm, Internet of Things, conaware paradigm, Con reasoning BibRef

Zannou, A., Boulaalam, A., Nfaoui, E.H.,
A Node Capability Classification in Internet of Things,
ISCV20(1-6)
IEEE DOI 2011
Internet of Things, network theory (graphs), neural nets, pattern classification, telecommunication network reliability, Neural network BibRef

Chetto, M., Queudet, A.,
EDF-based real-time scheduling for self-powered sensors: A survey of main theoretical results,
ISCV20(1-7)
IEEE DOI 2011
electric sensing devices, energy harvesting, power measurement, scheduling, EDF-based real-time scheduling, self-powered sensors, Earliest Deadline First BibRef

Mashari, M., Pahlavani, P., Ebrahimi, A.,
Optimizing Energy Consumption of Vehicle Sensor Networks Based On The K-means Clustering Method and Ant Colony Algorithm,
SMPR19(725-731).
DOI Link 1912
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Zhang, D., Shi, P., Zhang, W.A., Yu, L.,
Energy-Efficient Distributed Filtering in Sensor Networks: A Unified Switched System Approach,
Cyber(47), No. 7, July 2017, pp. 1618-1629.
IEEE DOI 1706
Energy measurement, Estimation, Quantization (signal), Size measurement, Switched systems, Symmetric matrices, Wireless sensor networks, Distributed filtering, H8 filtering, energy-efficient, sensor networks, switched, system BibRef