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Spatial reuse is an important challenge in multi-cell WLAN networks, such as ad-hoc and mesh networks, as well as sectorized antenna WLANs. However, the asynchronous handshake employed in the 802.11 MAC protocol is a severe limiting factor. Multiple parallel communications occurring between transmit/receive node pairs separated by a sufficient distance may be suddenly impaired by the asynchronous change of direction in the transmission occurring when a node replies with an ACK frame (this phenomenon, duly discussed in this paper, will be hereafter referred to as Hidden ACK Phenomenon).
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