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.
Cognitive Radio (CR) communication has been considered as one of the promising technologies to enable dynamic spectrum sharing in the next generation of wireless networks. Among several possible enabling techniques, Spectrum Sensing (SS) is one of the key aspects for enabling opportunistic spectrum access in CR Networks (CRN). From practical perspectives, it is important to design low-complexity wideband...
In this paper, we propose new receiver and transmitter architectures to use the Discrete Wavelet Packet Transform (DWPT) and its inverse transform (IDWPT) as a communication medium for wireless body sensor networks. The proposed original transmitter's and receiver's architectures are able to configure the number of sensors due to the considered regular and symmetric structures allowing to modify the...
Offshore seismic surveys are an indispensable part of the offshore oil and gas exploration, they provide an image of Earth's subsurface that can be used to determine the location and the size of the oil and gas reservoirs. The actual offshore seismic surveys are done with specific vessels towing up to ten kilometers of cables where the seismic sensors are attached, this technology have many disadvantages,...
We present a high-performance low-power digital baseband architecture, specially designed for an energy optimized duty-cycled wake-up receiver scheme. Based on a careful wake-up beacon design, a structured wake-up beacon detection technique leads to an architecture that compensates for the implementation loss of a low-power wake-up receiver front-end at low energy and area costs. Design parameters...
The demand for high throughput at low power consumption requires spectrum efficient as well as energy efficient design in next generation wireless networks. However, spectrum efficiency (SE) and energy efficiency (EE) can not be improved simultaneously. To this aim, in this work, the EE-SE trade-off issue is investigated in a cooperative cognitive radio network (CCRN). The secondary users (SUs) either...
We devise a centralized node localization algorithm, which relies on linearization and employs the orthogonal matching pursuit algorithm at its core, albeit with modifications and additional steps in order to address the localisation problem. The main feature of the algorithm is that it can determine the position of more than one simultaneously transmitting unknown nodes. This renders it generic and...
Home energy management system (HEMS) came out as an important tool for enhancing residential customer demand response applications in smart grid. This paper proposes an efficient algorithm for HEMS which considers customer load priorities and preferences and maintains the power consumption below the sanctioned limit such that minimum comfort violation occurs. The application of proposed algorithm...
A fast growing class of sensing technology is wearable, where network nodes are tightly coupled with the human body. Wireless body area networks (WBAN) technology has gained popularity over the last few years, with a wide range of applications covered, in particular in health and rehabilitation. Wearable and pervasive computing are able to sense, monitor and process the data to provide smart assistance...
In this paper, we propose a new power save operation as well as the corresponding protocol, called WiFi in Zizz (WiZizz), which judiciously exploits the characteristic of the channel bonding defined in IEEE 802.11ac and efficiently handles the channel bandwidth in an on-demand manner to minimize the traumatic energy spent by IEEE 802.11ac devices. Our extensive measurement and simulation show significant...
In a cognitive radio (CR) network, it is extremely important to implement periodic spectrum sensing in order to prevent secondary users (SUs) from interfering with primary users (PUs). Contention from SU transmitters may increase the back-off interval to the point that the time remaining to the beginning of next sensing interval is too short to transmit a frame. In this paper, we propose an energy-efficient...
Communication circuits/systems suffer from design margins required to support wide channel variations, increasing manufacturing process variations and multi-standard operation. Recent advances in channel and process adaptive communication systems, enabling zero-margin power-efficient operation and adaptive variation-tolerant self-healing systems enabling yield improvement are discussed.
A scheme for two-hop relay-assisted cooperative communications integrated with transmit power control, based on simple channel prediction, is presented. A large set of empirical on- and inter-body channel data is employed to model various scenarios of wireless body area network (WBAN) communications, from one isolated WBAN up to 10 closely located WBANs coexisting. Our study shows that relay assisted...
In this paper we present an advanced model for power consumption in communications. The new model for power consumed in communications takes into consideration parameters power consumption for the active mode, power consumption for the sleep mode, power consumption for the transient mode, transmission period, transient mode duration, sleep mode duration, and active mode duration. The new model for...
During the last decade, energy efficiency became one of the most challenging research fields in the IT domain. After optimising large-scaled hardware infrastructures, e.g. computing centres or server clusters, nowadays the focus has changed rapidly. Current R&D projects deal with two major areas. On the one hand embedded, energy self-sufficient system architectures and on the other hand wireless...
Spectrum sensing is used to detect the unexploited sub-bands in the radio environment. In order to improve the accuracy of the spectrum sensing, the cooperative spectrum sensing method is assumed to be the best method to be used. However, it consumes power by exchanging the sensing results among the participating nodes. An efficient cooperative spectrum sensing method is proposed in this paper to...
The paper presents DA-MAC, a density aware access method for efficient forwarding in multi-hop dense wireless sensor networks. Its principle is to offer a configurable channel sensing phase during which nodes request transmission opportunity in a way that avoids collisions. The receiver can thus schedule transmissions so that nodes may return to sleep and only wake up at their scheduled transmission...
We developed, implemented and tested a Nano-power Wake Up Radio mainly intended for Wireless Body Area Networks (WBANs), but it can be also used in other types of low power wireless networks. The radio was tested for power consumption and robustness to communication interferences from a wireless devices commonly found around the person carrying a WBAN. Results show that our radio has significantly...
Many protocols have been developed for the Wireless Body Area Networks, reducing the transceivers duty cycle, and the energy consumed for the communication. But, since regular transceivers use significant amount of power for idle channel listening, all of these protocols have high overhead in power consumption when sensors need to work with asynchronous events triggered from outside the network, or...
In this paper, we express the power consumption for the wireless receiver employing multiple antenna technique as a closed form function of the number of antennas, time duration, power dissipation for carrier sensing and data decoding, and the probability of successful carrier sensing. Based on the analytical model, we show that when MAC level power save mode is combined with PHY level power save...
In this paper, we propose a distributed algorithm to calculate a subgraph of a given wireless sensor network (WSN) connecting a set of sources and a set of sinks such that: 1) the length of a path connecting from a source to a sink in the subgraph does not exceed the distance from the source to the farthest sink, and 2) the number of links contained in the subgraph is minimized. The proposed algorithm...
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.