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In this paper, we study the tradeoff of efficiency and delay of Slepian-Wolf distributed source coding (DSC). In the considered network, Machine-Type Communications (MTC) devices transmit correlated data to one base station, the data sources follow a multi-variate Gaussian distribution. To reduce the consumption of communication resources by massive MTC devices, Slepian-Wolf coding is adopted to eliminate...
In this paper, we describe a 920 MHz band long range wireless SAW passive tag system (WSPTS) for vibration monitoring, which achieves more than 15 m reading distance. For the purpose of structural health monitoring (SHM) of aging infrastructures (e.g. bridge, building, and so forth), passive wireless sensor systems are an attractive option because they are operated battery-less and almost maintenance...
Data aggregation has been an important mechanism for achieving energy efflciency in WSN's. The aggregation reduces the transmission of redundant data which results in improved energy usage. A large number of data aggregation protocols have been developed in the past based on various techniques of optimizing the delay and energy. This paper surveyed the most prominent data aggregation protocols recently...
One of the most popular and efficient methods for conserving energy in Wireless Sensor Networks (WSNs) is data aggregation. This technique usually introduces an additional delay in the transmission of data packets. The inherent trade-off between energy consumption and end-to-end delay imposes an important decision to be made by the nodes, mainly to determine the most appropriate time for aggregating...
Wireless links are typically modeled in isolation as independent and parallel links. However, in reality, there is often a correlation in defects and impairments between collocated links. The spatial correlation of shadowing among proximate wireless links has been frequently observed. Although different types of correlated shadowing models have been proposed for wireless channels, these models are...
Sensors easily become faulty and unreliable subject to limited battery and insecurity. Data Fault is one of traditional faults in the wireless sensor networks. Data fault mainly uses distributed method through exchanging neighbors' measurements and voting for decision. But the detection accuracy performance is easily influenced by unbalanced fault distribution. Based on this, we propose the k-means...
The energy performance of Wireless Sensor Networks (WSNs) is more significant only when the design of Medium Access Control (MAC) Protocols is completed. The Proposed work deals with energy efficiency analysis of WSNs. To achieve energy efficiency in WSNs three different hybrid medium access control based protocols are preferred. The three protocols are Hybrid Medium Access Control (H-MAC), Hybrid...
In this paper, we study the issue of mobility scheduling for mobile data collector (MDC) in wireless sensor networks. Most existing work in this area focuses on geometric-based optimization without considering the spatial correlation among different locations. In this paper, we study the mobility scheduling problem from the informative perspective by using Gaussian process to capture the spatial correlation...
The number of applications that use industrial, scientific and medical (ISM) radio bands increase every day, creating interference problem for the wireless sensor networks (WSN) that generally operate on these bands. Cognitive radio sensor network (CRSN) has been proposed as a promising solution to this problem. However, since sensor nodes are energy-constrained devices energy efficient spectrum sensing...
In wireless sensor network (WSN), real-time network applications require good quality-of-service (QoS) guarantees, such as low packet delay and small backlog. Differentiated services (D-iffServ) mechanism is proposed to satisfy the QoS requirements in WSN. The stochastic characteristics need to be considered for the QoS performance analysis of DiffServ-based WSN. However, the existing works merely...
In this paper, the 32-channel readout front-end device with a Bluetooth 2.0 module and a MSP430 ultra-low power microcontroller for portable Electroencephalograph (EEG) acquisition is presented. In addition to the consideration of low power, low noise, and high efficient chip area usage, the extendable readout front-end chip is presented with a design of chopper-stabilized differential difference...
Delay jitter is a critical factor that must be considered in networked real-time applications that require accurate prediction of packet delivery times. Delay jitter can be smoothed by holding packets in a play-back buffer for a certain time called a play-back delay. In this paper, we propose a scheme to enhance the prediction of the play-back delay in Networked Control Systems (NCSs) with no need...
Delay jitter adversely affects the performance of networked real-time applications that require accurate prediction of packet delivery times. Delay jitter can be smoothed by holding packets in a play-back buffer for a certain time called a playback delay. In this paper, we propose a scheme to enhance the prediction of the play-back delay in networked control systems (NCSs) with no need for clock synchronization...
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