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To exploit frequency diversity in Wi-Fi channels, instantaneous channel quality must be estimated. However, there is a trade-off between acquiring channel quality information and improving protocol efficiency because channel estimation consumes time and frequency resource that ideally should be used for data transfer. In this paper, the authors present D-Fi (Diversity-aware Wi-Fi), a novel Wi-Fi PHY/MAC protocol that capitalizes on frequency diversity gains while sustaining protocol efficiency. The D-Fi design allows to estimate channel quality while D-Fi is performing channel contention using an OFDM-based Bloom filter.
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