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Physical Carrier Sensing plays a crucial role in the effectiveness of CSMA-based MAC protocols, yet its properties and impact on the system performance under slow fading channel have not been well understood. We demonstrate that carrier sensing can be highly unreliable even within the "carrier sensing range" and the channel is largely stable during a transmission between slowly moving mobile stations. Then we formulate the carrier sensing outage probability between competing mobile stations anddoi:10.1109/wcnc.2008.243 dblp:conf/wcnc/ShengV08 fatcat:pdmk4g5tere3vaqoavz5c4ep6m