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Hybrid automata model systems with both digital and analog components, such az embedded control programs. Many verification tasks for such programs can be expressed as reachability problems for hybrid automata. By improving on previous decidability and undecidability results, we identify the precise boundary between decidability and undecidability of the(More)
The channel estimation techniques for OFDM systems based on pilot arrangement are investigated. The channel estimation based on comb type pilot arrangement is studied through different algorithms for both estimating channel at pilot frequencies and interpolating the channel. The estimation of channel at pilot frequencies is based on LS and LMS while the(More)
In this paper, we present an algorithm for routing in wireless ad hoc networks using information about geographical location of the nodes. We assume each node knows its geographical position and the position of the node to which it wants to send a packet. Initially, the nodes only know their neighbors but over time they discover other nodes in the network.(More)
The Wireless Token Ring Protocol (WTRP) is a medium access control protocol for wireless networks in Intelligent Transportation Systems. It supports quality of service in terms of bounded latency and reserved bandwidth. WTRP is efficient in the sense that it reduces the number of retransmissions due to collisions. It is fair in the sense that each station(More)
The Wireless Token Ring Protocol (WTRP) is a medium access control protocol for wireless networks in Unmanned Aerial Vehicles. It supports quality of service in terms of bounded latency and reserved bandwidth. This quality of service guarantee is critical in mesh stability of the formation of the vehicles. The communication of the speed and the velocity of(More)
Hybrid systems combine diierential equations with discrete event systems. We consider the reachability problem: is there a trajectory from an initial state to a target state in the hybrid system. We show that for hybrid systems with decoupled diierential inclusions, the reachability problem can be decided in a nite number of steps.