The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Safety and security in marine environments is an emerging application area of low-power wireless sensor networks. Yet, these environments pose big challenges to network reliability. The IEEE802.15.4-TSCH protocol has been extensively regarded as a reliable low-power wireless sensor network solution. It requires, though, an external scheduling mechanism in place to allocate connections to specific...
In this paper, we study the performance of two cross-layer optimized dynamic routing techniques for radio interference mitigation across multiple coexisting wireless body area networks (BANs), based on real-life measurements. At the network layer, the best route is selected according to channel state information from the physical layer, associated with low duty cycle TDMA at the MAC layer. The routing...
Cognitive radar refers to an adaptive sensing system exhibiting high degree of waveform adaptivity and diversity enabled by intelligent processing and exploitation of information from the environment. The next generation of radar systems are characterized by their application to scenarios exhibiting non-stationary scenes as well as interference caused by use of shared spectrum. Cognitive radar systems,...
We present a new approach for enhancing spectrum efficiency by means of multisystem spectrum channelization. The proposed approach incorporates impact between spectrum channelization and exploiting channel state information at transmitter (CSIT). We create disparities in accuracy of CSIT for different systems through frame offsets between the systems such that the time segments of the best CSIT accuracy...
Wireless Mesh Network (WMN) deployments are poised to reduce the reliance on wired infrastructure especially with the advent of the multi-radio multi-channel (MRMC) WMN architecture. But the benefits that MRMC WMNs offer viz., augmented network capacity, uninterrupted connectivity and reduced latency, are depreciated by the detrimental effect of prevalent interference. Interference mitigation is thus...
Recent work has shown that network protocols which rely on precisely-timed concurrent transmissions can achieve reliable, energy-efficient, and conceptually simple network flooding. While these multi-transmitter schemes work well, they require all nodes in the network to forward every data packet, which has inherent inefficiencies for non-flooding traffic patterns (where not all nodes need to receive...
Multichannel communication has been proposed as alternative to adaptive (single-channel) routing protocols for mitigating the impact of interference and link dynamics in wireless sensor networks. While several studies have advocated features of both techniques (not without running up against contradicting arguments) a comprehensive study that aligns these results is still lacking. This paper aims...
In this paper, we analyze performance of cooperative spectrum sensing under counting rules when exponential model involving the spectrum usage (SU) is utilized to characterize the burst nature of primary user (PU) link. Considering both the reliability and the efficiency performance of sensing, we use the average error probability (AEP) in final decision making as metric. We derive a closed-form expression...
Cognitive radio technique is proposed as a means of improving the efficiency of current spectrum allocation policy by allowing the unlicensed secondary users (SU) to access the unused spectrum resources (white band) of the licensed primary users (PU). This technique largely relies on the secondary users' capability to detect the unused spectrum band, thus avoiding interference to the primary users...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.