Mobility

Improved Modeling of IEEE 802.11a PHY Through Fine-Grained Measurements

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Executive Summary

In wireless networks, modeling of the physical layer behavior is an important yet difficult task. Modeling and estimating wireless interference is receiving great attention, and is crucial in a wireless network performance study. The physical layer capture, preamble detection, and carrier sense threshold are three key components that play important roles in successful frame reception in the presence of interference. Using the authors' IEEE 802.11a wireless network testbed, they carry out a measurement study that reveals the detailed operation of each component and in particular they show the terms and conditions (interference timing, signal power difference, bit-rate) under which a frame survives interference according to the preamble detection and capture logic.

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