Current Issue : July - September Volume : 2017 Issue Number : 3 Articles : 5 Articles
Underwater acoustic sensor networks (UASNs) are often used for environmental\nand industrial sensing in undersea/ocean space, therefore, these networks\nare also named underwater wireless sensor networks (UWSNs). Underwater\nsensor networks are different from other sensor networks due to the\nacoustic channel used in their physical layer, thus we should discuss about the\nspecific features of these underwater networks such as acoustic channel modeling\nand protocol design for different layers of open system interconnection\n(OSI) model. Each node of these networks as a sensor needs to exchange data\nwith other nodes; however, complexity of the acoustic channel makes some\nchallenges in practice, especially when we are designing the network protocols.\nTherefore based on the mentioned cases, we are going to review general\nissues of the design of an UASN in this paper. In this regard, we firstly describe\nthe network architecture for a typical 3D UASN, then we review the\ncharacteristics of the acoustic channel and the corresponding challenges of it\nand finally, we discuss about the different layers e.g. MAC protocols, routing\nprotocols, and signal processing for the application layer of UASNs....
The Web of Things (WoT) plays an important role in the representation of the objects\nconnected to the Internet of Things in a more transparent and effective way. Thus, it enables\nseamless and ubiquitous web communication between users and the smart things. Considering the\nimportance ofWoT, we propose aWoT-based emerging sensor network (WoT-ESN), which collects\ndata from sensors, routes sensor data to the web, and integrate smart things into the web employing\na representational state transfer (REST) architecture. A smart home scenario is introduced to evaluate\nthe proposed WoT-ESN architecture. The smart home scenario is tested through computer simulation\nof the energy consumption of various household appliances, device discovery, and response time\nperformance. The simulation results show that the proposed scheme significantly optimizes the\nenergy consumption of the household appliances and the response time of the appliances....
IoT is the technical basis to realize the CPS (Cyber Physical System) for distribution networks, with which the complex\nsystem becomes more intelligent and controllable. Because of the multihop and self-organization characteristics, the large-scale\nheterogeneous CPS network becomes more difficult to plan. Using topological potential theory, one of typical big data analysis\ntechnologies, this paper proposed a novel optimal CPS planning model. Topological potential equalization is considered as the\noptimization objective function in heterogeneous CPS network with the constraints of communication requirements, physical\ninfrastructures, and network reliability. An improved binary particle swarm optimization algorithm is proposed to solve this\ncomplex optimal problem. Two IEEE classic examples are adopted in the simulation, and the results show that, compared with\nbenchmark algorithms, our proposed method can provide an effective topology optimization scheme to improve the network\nreliability and transmitting performance....
This paper investigates the outage performance of simultaneous wireless information and power transfer (SWIPT) in networkcoded\ntwo-way relay systems, where a relay first harvests energy from the signals transmitted by two sources and then uses the\nharvested energy to forward the received information to the two sources.We consider two transmission protocols, power splitting\ntwo-way relay (PS-TWR) and time switching two-way relay (TS-TWR) protocols.We present two explicit expressions for the system\noutage probability of the two protocols and further derive approximate expressions for them in high and low SNR cases. To explore\nthe system performance limits, two optimization problems are formulated to minimize the system outage probability. Since the\nproblems are nonconvex and have no known solutionmethods, a genetic algorithm- (GA-) based algorithmis designed. Numerical\nand simulation results validate our theoretical analysis. It is shown that, by jointly optimizing the time assignment and SWIPT\nreceiver parameters, a great performance gain can be achieved for both PS-TWR and TS-TWR.Moreover, the optimized PS-TWR\nalways outperforms the optimized TS-TWR in terms of outage performance. Additionally, the effects of parameters including relay\nlocation and transmit powers are also discussed, which provide some insights for the SWIPT-enabled two-way relay networks....
Wireless sensor networks (WSN) are one of the most evolving technologies\napplicable in various fields where sensitive information is required. However,\nthe constraints of limited resources and requirements for environmentdependent\nconnectivity and life cycle have urged designers to seek more efficient\nWSN infrastructures. In this paper, we have discussed and compared the\nresults of various single path protocols i.e. LEACH, PAGASIS and VGA. Performance\nanalysis of energy efficient multipath routing protocols incorporating\nwireless interference has also been performed....
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