![wifi packet structure wifi packet structure](https://www.electronics-notes.com/articles/connectivity/wifi-ieee-802-11/802-11g-erp-dsss-cck-ppdu.gif)
In this way, a NCS can accomplish complex control tasks without requiring cumbersome wiring infrastructures. NCSs exploit a packet switching network to connect spatially distributed sensors, actuators, and controllers ( Hespana et al., 2007). Moreover, the unpredictable behavior of the radio channel further worsen the problem. This issue is challenging because the network interface cards available on the market have been mainly conceived to provide a best effort service, without any guarantees on packet delay. The scientific community is now investigating in which measure this technology can be exploited also in real-time contexts, where several tasks have to be served with a high degree of determinism to provide the expected service, such as in Networked Control Systems (NCSs). In such networks, the wireless channel is shared among the stations and, in order to deal with packet collisions, a Carrier Sense Multiple Access with Collision Avoidance algorithm is employed. IEEE 802.11 Wireless Local Area Networks (WLANs) are very pervasively deployed in the consumer market, due to their ability to provide ubiquitous network access with high flexibility, cheap costs, and ease of installation and maintenance.