Wireless packet and ad hoc networking

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Widespread wireless packet and ad hoc networking applications are seen as the next revolution in data communications. Such applications require advanced wireless enabling technologies at the device, system, and computer engineering levels, in particular for ad hoc networks that are to operate without a preestablished infrastructure.It is well known that the information carrying capacity of such highly flexible and largely uncoordinated wireless networks is strictly limited and grows with a rate less than the number of nodes. In order to make such networks efficient, the most appropriate and advanced signal processing methods need to be applied to the physical layer of these networks.Additionally, experiments with known wireless packet protocols such as 802.11 and 802.16 have shown that current accessing methods are inadequate for large uncoordinated ad-hoc networks. New protocol strategies need to be developed which make maxium use of the physical layer capabilities of the individual nodes.This project addresses these issues from two angles: i) designing and verifying novel signal processing methods, in particular joint detection and interference cancellation methods. These are designed to approach the theoretical maximum information flow at any given node. ii) The design and implementation of novel protocols which are based on traffic and signal statistics to maintain high link throughputs and reliability with a minimum of control messages, thus allowing the network configuration to change dynamically without compromising network performance. An important component is the efficient integration of these two research objectives to demonstrate overall network efficiency.