Even if a collision occurs in IEEE 802.11 network, a transmissionmay be successfully decoded at the receiver if the signal strength of\none transmission is sufficiently stronger than the other transmission. This phenomenon is called ââ?¬Å?Physical Layer Captureââ?¬Â (PLC).\nWhile existing works have considered PLC between data frames, in this paper we investigate the case that an ACK frame collides\nwith the unfinished transmission of other data frames after the occurrence of PLC between data frames. As a result of this collision,\nthe ACK frame may be corrupted and the corresponding data frame needs to be retransmitted. We call this phenomenon ââ?¬Å?ACK\nCorruptionââ?¬Â (AC).We identify the characteristic of AC via extensive experiments and simulations. Our study reveals that AC can\noccur in all IEEE 802.11 variants and its chance is dependent upon the relative signal strength between the stations and the MCS\nsetting used. Further, we devise a way to avoid AC occurrence and evaluate its effectiveness.
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