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Issue No.07 - July (2009 vol.8)
pp: 865-879
Ruben Merz , EPFL, School of Computer and Communication Sciences
Jean-Yves Le Boudec , EPFL, School of Computer and Communication Sciences
For impulse-radio ultrawideband (IR-UWB) networks without global synchronization, the first step for correct packet reception is packet detection and timing acquisition: Before recovering the payload of the packet, the destination must detect that the packet is on the medium and determine when exactly the payload begins. Packet detection and timing acquisition rely on the presence of an acquisition preamble at the beginning of each packet. How this preamble is chosen is a network design issue and it may have quite an impact on the network performance. A simple design choice of the network is to use a common acquisition preamble for the whole network. A second design choice is to use an acquisition preamble that is private to each destination. The throughput with the latter choice is likely to be much higher, albeit at the cost of learning the private acquisition preamble of a destination. In this paper, we evaluate how using a common or private acquisition preambles affects the network throughput. Our analysis is based on analytical modeling and simulations. Using our analytical model, we show that a private acquisition preamble yields a tremendous increase in throughput compared to a common acquisition preamble. The throughput difference grows with the number of concurrent transmitters and interferers. This result is confirmed by simulations. Furthermore, additional simulations on multihop topologies with TCP flows demonstrate that a network using private acquisition preambles has a stable throughput. On the contrary, using a common acquisition preamble exhibits the presence of a compounding effect similar to the exposed terminal issue in IEEE 802.11 networks: The throughput is severely degraded and complete flow starvation may occur.
Ultrawideband, impulse radio, modeling techniques, algorithm/protocol design and analysis.
Ruben Merz, Jean-Yves Le Boudec, "Performance Evaluation of Impulse Radio UWB Networks Using Common or Private Acquisition Preambles", IEEE Transactions on Mobile Computing, vol.8, no. 7, pp. 865-879, July 2009, doi:10.1109/TMC.2008.163
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