Performance Analysis Of IEEE 802.11 DCF In Hidden Terminal And Non-ideal Channel Environment

In recent years,wireless communication technology and LAN technology have developed more and more rapidly.The wireless LAN proposed in response to these two technologies is widely used in military and medical applications because of its better mobility,flexibility,scalability,and efficient transmission rate.And emergency rescue and many other areas.At the same time,how to improve and improve wireless LAN communication performance has increasingly become the main focus of current research.The proposal of IEEE 802.11 protocol has become a major breakthrough in wireless communication technology.Now it has been applied as a mature network protocol to the entire society.The MAC layer protocol of IEEE 802.11 WLAN is divided into distributed coordination function(DCF)and point coordination function(PCF),and the distributed coordination function is based on the carrier-sense multiple access(CSMA/CA)mechanism with collision avoidance and the random channel access scheme of the exponential back-off process because of the characteristics of the ad hoc wireless network and the random channel connection.The method is widely used,which is the background of the research on the main use of communication protocols.Although IEEE 802.11 is the most popular communication protocol at present,because wireless LAN still has certain limitations,the impact of the network environment will have a non-negligible interference on the communication quality,such as hidden station effect,capture effect,security,and Reliability,path loss,etc.result in degraded network performance.In order to improve the efficiency and accuracy of wireless communication networks,this paper will focus on the analysis of the impact of hidden sites on communication networks and optimization issues in the improvement of wireless LANs,and analyze the DCF protocol of IEEE 802.11 WLAN from both time and space perspectives.Under the basic access mechanism and the existence and impact of hidden sites under the RTS/CTS access mechanism,the proposed two-dimensional discrete-time Markov chain model was improved and improved based on the existing literature,and the original literature was not mentioned.The actual network environment affected by non-ideal channels is studied to study the performance of the IEEE 802.11 protocol under continuous saturation.Finally,the accuracy and applicability of this model are evaluated by numerical simulation,which provides a good theoretical basis and reference value for improving the efficiency and accuracyof the communication network in the future.