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Träfflista för sökning "WFRF:(Teo Y) srt2:(2005-2009)"

Sökning: WFRF:(Teo Y) > (2005-2009)

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  • Lau, Buon Kiong, et al. (författare)
  • Transformations for nonideal uniform circular arrays operating in correlated signal environments
  • 2006
  • Ingår i: IEEE Transactions on Signal Processing. - 1053-587X. ; 54:1, s. 34-48
  • Tidskriftsartikel (refereegranskat)abstract
    • The Davies transformation is a method to transform the steering vector of a uniform circular array (UCA) to one with Vandermonde form. As such, it allows techniques such as spatial smoothing for direction-of-arrival (DOA) estimation in a correlated signal environment, developed originally for uniform linear arrays, to be applied to UCAs. However, the Davies transformation can be highly sensitive to perturbations of the underlying array model. This paper presents a method for deriving a more robust transformation using optimization techniques. The effectiveness of the method is illustrated through a number of DOA estimation examples.
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3.
  • March, V., et al. (författare)
  • Collision detection and resolution in hierarchical peer-to-peer systems
  • 2005
  • Ingår i: Proceedings - Conference on Local Computer Networks, LCN. - 0769524214 - 9780769524214 ; , s. 2-9
  • Konferensbidrag (refereegranskat)abstract
    • Structured peer-to-peer systems can be organized hierarchically as two-level overlay networks. The top-level overlay consists of groups of nodes, where each group is identified by a group identifier. In each group, one or more nodes are designated as supernodes and act as gateways to the nodes at the second level. A collision occurs during join operations, when two or more groups with the same group identifier are created at the top-level overlay. Collisions increase the lookup path length and the stabilization overhead, and reduce the scalability of hierarchical peer-to-peer systems. We propose a new scheme to detect and resolve collisions, and we study the impact of the collision problem on the performance of peer-to-peer systems. Our simulation results show the effectiveness of our scheme in reducing collisions and maintaining the size of the top-level overlay close to the ideal size.
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  • Resultat 1-4 av 4

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