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Due to the shared nature of the wireless medium, the performance of wireless sensor network is often limited by both internal interference and external interference. The internal interference is that simultaneous traffic activity by neighboring nodes in the same network, while the external interference is from wireless transmissions by other types of devices, such as Wi-Fi and Bluetooth nodes. In...
Cross-technology interference on the license-free ISM bands has a major negative effect on the performance of Wireless Sensor Networks (WSNs). Channel hopping has been adopted in the Time-Slotted Channel Hopping (TSCH) mode of IEEE 802.15.4e to eliminate blocking of wireless links caused by external interference on some frequency channels. This paper proposes an Enhanced version of the TSCH protocol...
Current lifestyles promote the development and advancement in wireless technologies, especially in Wireless Sensor Networks (WSN) due to its several benefits. WSN offers a low cost, low data rate, flexible routing, longer lifetime, and low-energy consumption suitable for unmanned and long term monitoring. Among huge WSN applications, some key applications are smart houses, environmental monitoring,...
Automated information gathering in military, industrial, environmental and surveillance applications which requires improved QoS guarantees as well as high reliability is well supported with Wireless Multimedia Sensor Networks (WMSNs). In this paper, we propose a more reliable energy efficient multi-path routing scheme for multimedia-traffic. The proposed protocol quickly chooses partial disjoint...
Frequency agility is considered as an indispensable feature of next-generation wireless sensor networks (WSNs), which will have to cope with highly interfered environments due to the increasing diffusion of wireless devices operating in unlicensed bands. In this paper we investigate some design aspects related to spectrum sensing in “cognitive” WSNs, relating the duration of sensing time to the probability...
Location-based multicast routing (LMR) technique can increase the lifetime and the channel capacity of wireless sensor network (WSN) by reducing the number of duplicated data transmissions and control messages. Previous LMR algorithms can suffer performance deterioration in real deployments because they consider only location of nodes and can transmit packets across concrete walls or other interfering...
In last years, research on developing sensing devices allows new applications for preserving the environment. A typical application foresees to collect data through sensors deployed in the desired area. We proposed to use Ultrawideband (UWB) technology to provide connectivity among sensors enabling the collecting site (the sink) to store environmental parameters. When necessary those parameters are...
Empirical results from a performance study of an Integrated Wireless Sensor Network (WSN) and Wireless Local Area Network (WLAN) are presented in this paper. Integration of heterogeneous wireless technologies using different modulation techniques such as direct-sequence spread spectrum (DSSS) and orthogonal frequency division multiplexing (OFDM) require careful deployment planning and configuration...
Wireless Sensor Networks (WSNs) operate with varying duty cycles to meet their application-specific criteria such as the availability, reliability, and the life expectancy of the system. This variation in duty cycle consequently affects the system characteristics including the interference and collision of signals. However, the sensitivity to physical jamming attacks with respect to duty cycle of...
The IEEE 802.15.4 as one of the facto low layer communication standards for PANs and WSNs may be interfered by other wireless devices in the ISM frequency bands, especially at home, such as devices of IEEE 802.11b, Bluetooth, Cordless telephone, and microwave oven. This paper examines the mutual interference effects of 2.4 GHz devices which are widely deployed at home, via both theoretical analysis...
In the modern wireless applications of factory automation, interference phenomena among near operating wireless networks can be the cause of severe performance degradation. To avoid this possibility and prevent deleterious system failures, simulations may offer a real and reliable solution. In this paper a new simulator is presented, allowing cross-layer analysis of interference phenomena arising...
This paper presents a preliminary assessment of the potentialities of the exploitation of smart antennas in WSNs. The more trivial benefits coming from such an integration are: (a) an efficient spatial management of the radiated energy and (b) an efficient and adaptive reuse of wireless links in order to increase the network throughput and to solve coexistence problems arising from the integration...
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