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Recently, the multipath wireless channel has been largely investigated for the purpose of key extraction. This paper tackles practical issues affecting the reliability of key agreement. The authors first analyze the effect of delay between the channel estimates on the probability of disagreement, and they propose a robust key extraction mechanism against delay. Later, they study the effect of mobility and improve their key generation mechanism taking into account the de-correlation of the channel. Finally, they investigate the impact of mobility on the overall secret bit generation rate.
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