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Emerging applications of wireless sensor networks require accurate event detection while coping with in-network congestion, delay, power and probability of false alarm (PFA) constraints. Dynamic spectrum access stands as a promising and spectrum-efficient communication approach for resource-constrained wireless sensor networks. In this paper, we propose a two tier sensor network where the lower tier...
Cooperation can greatly improve the performance of wireless networks, but not all the time. Due to the dynamics of the wireless network and incomplete information, in many cases, only some uncertain opportunities of cooperation can be found. When these situations arise, opportunistic cooperation techniques, such as algorithms for opportunistic routing, opportunistic spectrum sharing etc. have been...
Latency is a critical concern in interactive or delay-sensitive services such as interactive IPTV and VoIP. This is especially so when using network coding as a means to conserve bandwidth in these bandwidth-hungry services. In practical network coding, packets are coded in batches and thus suffer a large average delay per packet when packets get decoded after the whole batch is received. A larger...
Network coding is a method that promises to achieve the min-cut capacity in multicasts. However, pushing towards this gain in throughput comes with two sacrifices. Delay suffers as the decoding procedure requires buffering and is performed in batches of coded packets, and unfairness prevails in terms of delay increases between receivers with worse channel conditions and those with better channel conditions...
Cooperative medium access control (MAC) protocols make use of the multi-rate capabilities of IEEE 802.11 to achieve higher throughput and shorter delay. This is achieved through transmitting a packet via a helper node by means of a faster two-hop links rather than a slower direct one-hop link. The cooperative MAC protocol transmits only one packet from the source node for each successful transmission...
Ultra-wideband (UWB) is a physical (PHY) layer technology that promises high transmission rates, as well as high resistance to noise and multipath effects. However, the impulse-based nature of UWB, coupled with its low transmission power, makes it difficult to enable efficient detection of the signals. Consequently, conventional carrier-sensing based MAC protocols cannot be used with a UWB PHY. In...
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