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.
The following topics are dealt with: network coding; cognitive radio; wireless sensor networks; biomedical communication; smart grid; social networks; vehicular connectivity; wireless local area networks; mobile communication; and underwater networks.
An optimal-stochastic-resonance-based spectrum sensing approach under color noise environment is proposed in this paper. It can improve the detection performance of energy detector in color noise background especially under low signal-to-noise radio (SNR). The suitable stochastic resonance (SR) noise and corresponding driving parameter can be introduced to maximize the output SNR of the SR system...
Both the network mobility and the terminal mobility are likely to co-exist in the future. These two mobile communication paradigms have different wireless connectivity models and likely to deploy different schemes to address the wireless related performance issues for TCP. In this paper, we consider TCP Snoop, which allows a mobile terminal to efficiently recover from wireless-related losses. For...
In the last decade wireless communications significantly improved, being widely used in various areas such as health, education, industry and research. Recently, the automobile industry is adopting wireless technologies in order to improve the services offered, such as safety, route planning and infotainment. In particular, Vehicular Ad-Hoc Networks (VANETs) are being promoted to improve safety and...
Traffic safety can be improved by using a vehicular dedicated communication protocol. The standard IEEE 802.11p is being developed for this purpose. The physical layer properties of this draft are based on the already widely used IEEE 802.11a standard. Nevertheless, the propagation conditions in vehicular communications are different to the ones considered for 802.11a, which is focusing on nomadic...
The time-varying propagation channel in vehicle-to-vehicle (V2V) communications strongly influences the performance of a wireless system in terms of e.g. channel capacity or outage probability. Assuming knowledge of the channel characteristics, in simulations these parameters are generally calculated by using isotropic radiators instead of real antennas, thus neglecting the influence of the antennas'...
In this paper, we present a low-complexity Interference Aware Multiple Relay Selection (IAMRS) scheme for cognitive radio system. The main objective in selecting multiple relays is to maximize the SNR at the destination under the constraint of acceptable interference to the primary users (PU). The computational complexity of finding an optimal IAMRS by exhaustive search grows exponentially with the...
Physical-layer network coding (PLNC) is an emerging technique that may substantially improve the throughput capacity. In the literature, most existing studies in PLNC focus on a three-node communication system, in which two source nodes exchange information with the help of a common relay node. In this paper, we study the impact of PLNC in a large-scale random wireless network. Specifically, we address...
Dynamic Spectrum Leasing (DSL) was recently proposed in [1]-[4] as a new way to achieve dynamic spectrum sharing (DSS). Unlike previously considered dynamic spectrum access (DSA) proposals, DSL allows for the spectrum owner, called the primary user, to dynamically adjust the amount of interference it is willing to tolerate from secondary users. In response, the secondary users update their transmit...
In this paper, we present a feasible communication concept within the field of ambient networks and cognitive radios. The approach deals with the integration of different radio modules into an embedded communication platform. Basic idea is the simultaneous coexistence of multiple independent network interfaces, which allows us to combine the advantages of different communication technologies. At the...
Routing is critical in wireless sensor networks (WSNs). It has been widely studied in recent years and many new protocols have been proposed. In this paper, based on observations on event-driven wireless sensor networks, we propose algorithms to reduce power consumption and improve data quality in wireless sensor networks. In our algorithms, sensor nodes reduce the sampling frequency and number of...
Distributed antenna systems(DAS) are techniques to improve the coverage and capacity of wireless system by reducing large scale fading of wireless channels. It is especially effective in noise limited scenarios, e.g. uplink transmission. In this paper, we propose a DAS layout where multiple sectorized antennas are located at the corners of hexagonal sectors. These distributed antennas are connected...
Road traffic congestion constitutes a parameter that significantly affects quality of life in modern cities, while it has a direct impact on the environmental pollution. Optimizing the traffic flows would bring considerable and multi-aspect gains. In this light, this paper proposes an intelligent traffic management system for the provision of a dynamic, in real-time fleet navigation service at large...
In the cooperative system with a large number of users, the base station may select a subset of users to serve in order to maximize the total throughput. The brute-force search for the optimal user set, however, is computationally prohibitive. We propose a clustering algorithm for cooperative communication systems, whose objective is to increase the cellular network throughput and further improve...
To address the issue of increasing health care costs and overcrowded care giving institutions, there is an increasing focus on the use of mobile technology and biological sensors in developing better Tele-health systems. Remote monitoring of cardiac activity is a central endeavor of Telemedicine. This article describes the implementation and evaluation of the performance of an electronic health ECG...
Research on using WLAN from vehicles has been ongoing for quite a while now. Exploiting already available WLAN APs from fast moving vehicles is a challenging and interesting area of research. In this paper, we measure the data rates achievable in a typical drive thru set up. One reason of preferring WLANs over Cellular systems for getting broadband connectivity is that the former promise much higher...
This paper evaluates the usefulness of watchdog modules for intrusion detection. A watchdog is the basic component for the construction of most of the intrusion detection systems proposed so far for self-organizing wireless networking systems like VANETs. Contributions of this work are threefold. First, the component is designed to be protocol independent, thus compatible with any different types...
Physical properties of hydroacoustic communication channels differ essentially from those of conventional terrestrial radio channels, the former being characterized by the long propagation delays, limited bandwidth, extremely complex and quickly varying reverberation, and the half-duplex nature of underwater acoustic modems. This motivates a substantial redesign of the algorithms and techniques of...
Reliability in Ricean multiple-input-multiple-output (MIMO) channels is crucial for safety-related vehicle-to-vehicle (V2V) applications. In Ricean channels, there is a signal-to-noise ratio-dependent critical data rate below which signaling with zero outage is possible. The link will be more reliable the higher this critical data rate is. We present results of spectral efficiency and outage probability...
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.