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In this paper, the authors investigate the impact of aggregate interference in a secondary spectrum access system. Particularly, meteorological radar operating in 5.6 GHz band is considered to be a primary user. Secondary users are WLAN devices spreading in a large area which induce aggregate interference to the radar. They develop a mathematical model to derive the Probability Distribution Function (PDF) of the aggregate interference. The derivation considers Dynamic Frequency Selection (DFS) mechanism for the protection of the radar such that the transmission of each WLAN is regulated by an interference threshold.
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