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The accuracy of centroid localization based on the connectivity information between a target node and multiple randomly scattered reference nodes is investigated. First, the accuracy of the centroid localization is analyzed in a general fading environment, and it is shown that the ambiguity area of this localization technique is inversely proportional to the density of the reference nodes. Additionally, this area is at the same order and in the best case half of the ambiguity area provided by estimating the location of a target node as the location of its nearest reference node. Furthermore, increasing the transmission power of a target node will increase the accuracy of the localization, but only up to a certain limit. Then, the findings on centroid localization are verified by computer simulations. [ABSTRACT FROM AUTHOR]

In this paper, we develop a cross-layer analytical framework for studying the performance of reliable relaying schemes in multihop cooperative diversity systems. A generalized signaling model over independent nonidentical Nakagami-m fading channels is assumed, and mathematical expressions for end-to-end throughput rate, spectral efficiency, and latency distribution are derived. The proposed framework can capture the effect of correlated packet errors caused by cooperative retransmission attempts and, thus, adequately evaluate the network performance. Using the framework, the performance of automatic-repeat-request-based relaying schemes is demonstrated over a range of network conditions and system parameters. It is shown that tradeoffs are necessary among network robustness, throughput rate, spectral efficiency, and latency variability. [ABSTRACT FROM AUTHOR]