Kaushik R. Chowdhury

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The availability of low-cost hardware such as CMOS cameras and microphones has fostered the development of Wireless Multimedia Sensor Networks (WMSNs), i.e., networks of wirelessly interconnected devices that are able to ubiquitously retrieve multimedia content such as video and audio streams, still images, and scalar sensor data from the environment. In(More)
Cognitive radio (CR) technology is envisaged to solve the problems in wireless networks resulting from the limited available spectrum and the inefficiency in the spectrum usage by exploiting the existing wireless spectrum opportunistically. CR networks, equipped with the intrinsic capabilities of the cognitive radio, will provide an ultimate spectrumaware(More)
0140-3664/$ see front matter 2009 Elsevier B.V. A doi:10.1016/j.comcom.2009.06.011 * Corresponding author. Tel.: +1 404 510 9089. E-mail addresses: kaushikc@ece.gatech.edu (K.R. bo.it (M.D. Felice). 1 This work was completed when the author was Broadband Wireless Laboratory, Georgia Institute of Te USA. Recent research in the emerging field of cognitive(More)
1570-8705/$ see front matter 2009 Elsevier B.V doi:10.1016/j.adhoc.2009.10.004 * Corresponding author. Tel.: +1 404 510 9089. E-mail addresses: c.cormio@poliba.it (C. Corm (K.R. Chowdhury). Cognitive radio (CR) technology enables the opportunistic use of the portions of the licensed spectrum by the CR users, while ensuring low interference to the primary(More)
Cognitive radio (CR) technology enables the opportunistic use of the vacant licensed frequency bands, thereby improving the spectrum utilization. However, the CR operation must not interfere with the transmissions of the licensed or primary users (PUs), and this is generally achieved by incurring a trade-off in the CR network performance. In order to(More)
1570-8705/$ see front matter 2009 Elsevier B.V doi:10.1016/j.adhoc.2009.01.002 * Corresponding author. E-mail address: ccormio@ece.gatech.edu (C. Corm 1 This work was conducted during her stay at BWN In cognitive radio (CR) networks, identifying the available spectrum resource through spectrum sensing, deciding on the optimal sensing and transmission times,(More)
A new design for an energy harvesting device is proposed in this paper, which enables scavenging energy from radiofrequency (RF) electromagnetic waves. Compared to common alternative energy sources like solar and wind, RF harvesting has the least energy density. The existing state-of-the-art solutions are effective only over narrow frequency ranges, are(More)
| The availability of low-cost hardware is enabling the development of wireless multimedia sensor networks (WMSNs), i.e., networks of resource-constrained wireless devices that can retrieve multimedia content such as video and audio streams, still images, and scalar sensor data from the environment. In this paper, ongoing research on prototypes of(More)
Existing research in transport protocols for wireless ad-hoc networks has focused on reliable end-to-end packet delivery under uncertain channel conditions, route failures due to node mobility and link congestion. In a cognitive radio (CR) environment, there are several key challenges that must be addressed apart from the above concerns. The intermittent(More)