Ad hoc networks are multi-hop wireless networks without a pre-installed infrastructure. Such networks are widely used in military applications and in emergency situations as they permit the establishment of a communication network at very short notice with a very low cost. Video is very sensitive for packet loss and wireless ad-hoc networks are error prone due to node mobility and weak links. H...

ad hoc networks are multi-hop wireless networks without a pre-installed infrastructure. such networks are widely used in military applications and in emergency situations as they permit the establishment of a communication network at very short notice with a very low cost. video is very sensitive for packet loss and wireless ad-hoc networks are error prone due to node mobility and weak links. h...

many performance evaluations for ieee 802.11distributed coordination function (dcf) have been previouslyreported in the literature. some of them have clearly indicatedthat 802.11 mac protocol has poor performance in multi-hopwireless ad hoc networks due to exposed and hidden nodeproblems. although rts/cts transmission scheme mitigatesthese phenomena, it has not been successful in thoroughlyomit...

IEEE 802.11 MAC protocol is the standard for wireless LANs, it is widely used in testbeds and simulations in the research for wireless multi-hop ad hoc networks. However, this protocol was not designed for multi-hop networks. Although it can support some ad hoc network architecture, it is not intended to support the wireless mobile ad hoc network, in which multi-hop connectivity is one of the m...

Multi-hop ad hoc networks are envisioned to be an integral part of future mobile networks. Today, however, ad hoc networks lack the necessary resilience and reliability. This work proposes to use P2P routing overlays to enhance the dependability and performance of multi-hop ad hoc networks for devices that are subscribed to a provider.

Over the past decade wireless multi-hop ad-hoc networks have received a tremendous amount of research focus. Mobile devices equipped with wireless short range communication technologies make possible new applications for spontaneous communication, interaction and collaboration. The collaboration is used to facilitate communication when mobile devices are not able to establish direct communicati...

Many performance evaluations for IEEE 802.11distributed coordination function (DCF) have been previouslyreported in the literature. Some of them have clearly indicatedthat 802.11 MAC protocol has poor performance in multi-hopwireless ad hoc networks due to exposed and hidden nodeproblems. Although RTS/CTS transmission scheme mitigatesthese phenomena, it has not been successful in thoroughlyomit...

Time synchronization is crucial in ad hoc networks. Due to the infrastructure-less and dynamic nature, time synchronization in such environments is vulnerable to various attacks. Moreover, time synchronization protocols such as IEEE 802.11 TSF (Timing Synchronization Function) often suffer from scalability problem. In this paper, we address the security and the scalability problems of time sync...

In this paper, we evaluate the capacity of multi-channel, multi-hop ad hoc network. In particular, we show the performance of multi-hop ad hoc network with single channel IEEE 802.11 MAC utilizing different topologies. We also introduce scaling laws of throughputs for large-scale ad hoc networks and propose the theoretical guaranteed throughput bounds for multi-channel grid topology systems. We...