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Cross-layer opportunistic scheduling on DQCA-based WLAN systems yields high performance results. This paper emphasizes the need for accurate channel state information (CSI) and presents an enhanced mechanism that provides frequent CSI updates. The proposed idea consists in introducing special update frames specifically dedicated to channel state estimation. The impact of this mechanism on the performance of the system is evaluated through simulations. The paper shows that there is a trade-off between the overall system performance and the number of update frames that are used. The periodicity of these special frames is a parameter that needs to be carefully selected, depending on the channel time-variation characteristics.