英语翻译With ACK,the transmitter does not send redundant packets

英语翻译With ACK,the transmitter does not send redundant packets for theinformation that is already successfully decoded.Hence,theamount of traffic in the system is reduced and the probabilityof collision is smaller at the cost of added complexityand additional bandwidth to transmit the “ACK”.Anotherclass of random access based MAC protocols uses carriersensing.Basically,a user that wishes to transmit sensesthe channel before it attempts to send.Camer sensingreduces the collisions by avoiding collisions with ongoingtransmissions.The medium access control sub-layer of thewireless LAN 802.11 standards uses CSMNCA (CarrierSensing Multiple Access/Collision Avoidance).In case ofcollision,each transmitter will back off for a random periodof time before its next attempt.In particular,we consideran exponential back-off algorithm [lo].In this paper,we study the performance of a networkedcontrol system with a wireless network adopting one of theMAC protocols discussed above.Given a MAC protocol,we can find the probability distribution of time delay andpacket losses as a function of p,the probability of successon each transmission,and the number of time slots in asample period.The performance of different MAC protocolsare compared in terms of the control performance index wechoose.麻烦不要翻译软件翻的