The Analysisi And Reseach On The Performance Of WLAN Under Interference Environment

In recent years, with the rapid development of information technology, the business types of communications are on the increase continuously. At the same time, the users have high requirement on the network, the traditional network can no longer meet such a growing business needs. WLAN (Wireless Local Area Network) technology emerged as the times require, it is being applied widely for the features of flexibility, mobility, quick access, easy to install and extend.However, there are a variety of wireless equipments in 2.4G ISM frequency band. These interferences produced by such equipments affect the performance of WLAN severely. How to reduce the interference has dual significance of theory and practice. In this paper, the objects researched are WLAN and Mesh networks. I analysis the network performance, research interference mechanism and anti-interference mechanism, focus on the interference situation on 2.4G frequency band and technology and strategy of anti-interference.Introduce the channel characteristics of wireless communications, the important protocol family of WLAN for PHY and MAC. Analyze the types of interferences in the wireless channel, the principle and technique of anti-interference in different layers.Analyze the performance of WLAN under Bluetooth interference. In the presence of Bluetooth interference, analyze the signal models of Bluetooth and WLAN, choose suitable signal models and parameters of channel models. Present the system method of adaptive filtering with Rake receiver to overcome the interference of Bluetooth, this method is simple and effective. In the process of research, improve adaptive filter algorithm. Change the fix step sizeμto a functionμ(n). Make high speed and accuracy of the convergence by adjustμ(n). At last, complete system simulation by Matlab, analyze the improvement of network performance after using this system.