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We study the physical layer design of a distributed time-division multiple access (TDMA) protocol for wireless body area networks (WBAN). The distributed TDMA scheme is derived from a bio-inspired algorithm known as Pulse-Coupled Oscillator (PCO), in which each node in the network updates its state based on its knowledge of the neighborhood. ON-OFF ultra wide band (UWB) modulation is used by the sensors...
Ultra wide band (UWB) is an appropriate candidate used into the physical layer of the wireless body area networks (WBAN). In this paper, a novel UWB transreceiver structure is presented, where a Miller encoder is adopted in the transmitter side and a non-coherent detection scheme is used in the receiver side. Since the power spectral density (PSD) of the UWB signal plays a major role in the coexistence...
The fluctuations of the price of crude oil is pushing the oil companies to increase the investments in seismic exploration of new oil and gas reservoir. Seismic exploration requires a large number (500 divide 2000 nodes/sqkm) of sensors (geophones or accelerometers) to be deployed in outdoor over large areas (ges 20 sqkm) to measure backscattered wave fields. A storage/processing unit (sink node)...
Recent developments in ultra wideband (UWB) technology have opened a way to create wireless networks for personal health care monitoring. This personal area wireless network with a set of wireless nodes mounted on body is popularly known as body area network (BAN). A typical BAN has a set of thirty to fifty wireless sensors with a low transmit power constraint. Also, the wireless channel seen in by...
By considering the characteristics of Ultra- wideband (UWB) communications networks, ie., short transmission range, accurate ranging, and low transmission/interference power, we propose a Distributed, Exclusive region (DEX) based MAC protocol for multi-hop UWB based wireless networks. DEX can effectively explore the spatial multiplexing gain of UWB networks and allow users to efficiently and fairly...
Ultra-wideband (UWB) has become one of the key technologies in wireless communication industries. In this paper we discuss and evaluate the performance of UWB under different channel conditions when it is applied for wireless sensors. The simulation was carried out for various detection and modulation schemes. Simulation results confirm that UWB with coherent detection outperforms the noncoherent...
In emerging cognitive radio (CR) networks, the first cognitive task preceding any dynamic spectrum management is the sensing and identification of spectrum holes in wireless environments. This paper develops a distributed compressed spectrum sensing approach for (ultra-)wideband CR networks. First, compressive sampling is performed at local CRs to scan the very wide spectrum at practical signal-acquisition...
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