By Adnan Majeed, Saquib Razak, Nael B. Abu-Ghazaleh, Khaled A. Harras (auth.), Pedro M. Ruiz, Jose Joaquin Garcia-Luna-Aceves (eds.)

This ebook constitutes the refereed complaints of the eighth overseas convention on Ad-Hoc, cellular, and instant Networks, ADHOC-NOW 2009, held in Murcia, Spain, in September 2008.

The 24 revised complete papers and the ten brief papers have been conscientiously reviewed and chosen from ninety two submissions. The papers care for advances in Ad-Hoc networks, mesh networks, sensor networks and vehicular networks.

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Extra resources for Ad-Hoc, Mobile and Wireless Networks: 8th International Conference, ADHOC-NOW 2009, Murcia, Spain, September 22-25, 2009 Proceedings

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One of the main reasons for this poor performance is the fact that shortest-path routing protocols tend to select relatively long-distance hops, which are then subject to interference, similar to the observations in [8]. Even if the routing metric is changed to select more stable links, the problems of sharing a limited bandwidth wireless channel, interference from transmissions in the neighborhood, etc. can still result in relatively poor overall performance [20]. Almost all MANET routing protocols provide parameters to adapt the protocol behavior to the specific characteristics of the network in which they are deployed.

This factorization will be represented by an overall factor graph2 , composed of three tree-like factor subgraphs corresponding to the utilized concatenated Zigzag codes (see Figure 3), and a Trellis-like subgraph describing the statistical structure of the multiterminal source model. Regarding this latter MS subgraph, observe that the generation model for the correlated sensors can be reduced to an equivalent HMM that directly outputs the pair (Uk1 , Uk2 ) without any reference to the HMM output variable Ek .

A neighbour can then estimate the channel gain based on the strength of the busy tone and determine whether it is allowed to transmit if its transmission would not add more than a fixed amount of noise; this is similar to PCMA [8]. In addition, the sender saves energy by transmitting the data packets and busy tone BTt at reduced power based on the power level of the received CTS. Muqattash and Krunz [10] propose the power controlled dual channel (PCDC) protocol in which the RTS and CTS are transmitted on a control channel.

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