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Cognitive Radio (CR) is an innovative approach based on Software Defined Radio (SDR) that utilizes frequency spectrum efficiently to accommodate large number of users. Fast & fine spectrum sensing (to determine available free spectrum) is the primary objective in CR systems. Spectrum sensing is effected by multipath and shadowing which are the major hindrances in wireless communication; there...
The increased contention and collisions in dense networks trigger excessive scans for finding AP. The collective effect of simultaneous probes from all devices create even more contention in the network. Eventually, the devices start continuous cycles of probing since network condition does not improve after the handoff. Traces we have collected during Infocom 2012 and at busy airport terminals show...
The high vulnerability of the wireless sensor nodes to jamming arises from the low resilience and easy differentiability of protocol control messages, and the high predictability of node wakeup schedules. In this paper, we propose Jam-Buster — a jam-resistant solution for WSN, orthogonal to the existing antijamming solutions, that increases resilience by using multi-block payloads, eliminates differentiation...
The high vulnerability of nodes in a WSN to jamming arises from the low resilience to jamming signals, easy differentiability of packet types and high predictability of wakeup schedules. In this paper, we propose Jam-Buster — a jam-resistant solution for a single channel WSN that increases resilience by using multi-block payload, eliminates differentiation by using equal size packets and reduces predictability...
Delay in a duty-cycled network occurs when the sender waits for its receiver to be awake. Exploiting multiple receivers instead of a single receiver at each hop allows the sender to use the node that wakes up the soonest and so reduce delay. However, current MAC-layer anycast protocols either suffer from high signaling or synchronization overhead and are only appropriate for low duty cycle, low traffic...
Wireless sensor networks typically conserve energy by following a periodic wakeup-sleep schedule: nodes minimize idle time and spend most of their time in a low power sleep state. In order to communicate and exchange data in such a network, the current duty-cycling MAC protocols either require tight synchronization between the neighbor wakeup schedules or spend a significant amount of energy in signaling...
Synchronization and signaling are two common approaches used for coordination in duty-cycling wireless sensor networks. In this paper we analyze the trade off between these two approaches used for energy-efficient communication. Finally, we present Neighborhood-based Power Management (NPM), a hybrid MAC protocol that minimizes signaling overhead through opportunistically gained knowledge about neighbor...
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