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We present a new protocol for power control in ad hoc networks. We describe the issues in conceptualizing the power control problem, and provide an architecturally simple as well as theoretically well founded solution. The solution is shown to simultaneously satisfy the three objectives of maximizing the traffic carrying capacity of the entire network,(More)
— In this paper, we consider the problem of power control when nodes are non-homogeneously dispersed in space. In such situations, one seeks to employ per packet power control depending on the source and destination of the packet. This gives rise to a joint problem which involves not only power control but also clustering. We provide three solutions for(More)
— A distributed algorithm to achieve accurate time synchronization in large multihop wireless networks is presented. The central idea is to exploit the large number of global constraints that have to be satisfied by a common notion of time in a multihop network. If, at a certain instant, Oij is the clock offset between two neighboring nodes i and j, then(More)
The results of an extensive experimental study of the performance of the TCP protocol over wireless multi-hop ad hoc networks are presented. The investigations are performed in a real indoor environment over a network of laptops equipped with off-the-shelf IEEE 802.11b wireless cards. The cards were partially covered with copper tape to reduce their range,(More)
In adaptive control, a standard approach is to resort to the so-called certainty equivalence principle which consists in generating some standard parameter estimate and then using it in the control law as if it were the true parameter. As a consequence of this philosophy, the estimation problem is decoupled from the control problem and this The rst author(More)
applies and teaches advanced methodologies of design and analysis to solve complex, hierarchical, heterogeneous and dynamic problems of engineering technology and systems for industry and government. Abstract This work is a continuation of recent efforts aimed at understanding the interplay of control, communication and computation in systems whose sensors,(More)
n many large systems, such as manufacturing systems and I communication networks, whenever a resource becomes available , one has to decide which of several tasks contending for its attention should be performed next. Such problems are called " scheduling " problems. They are control problems of immense economic importance, and have often been formulated(More)
This paper describes a proposed testbed named Illinois Wireless Wind Tunnel (iWWT). The goal of the testbed is to implement "scaled" versions of wireless networks for the purpose of accurate repeatable evaluation of wireless protocols. The testbed will be implemented in an electromagnetic anechoic chamber at the University of Illinois at Urbana-Champaign.(More)
Usage of image processing techniques for robotic systems is essential to make robot which can perform tasks like human. In this paper a person follower robotic system is proposed using an NI Single-board Reconfigurable Input-Output (SBRIO-9632). The board has real time controller and a Field Programmable Gate Array (FPGA) device. The controller and devices(More)