The Research Of Double-side Power Amplifier And Antenna Of Mobile Computer Network

With the increasing demand for network communication, people hope to have any form of communications whenever and wherever including data, voice and video with anyone, and to realize that host computers can roam in the network. People have put forward the concept of mobile computer network. To make wireless network system not only support the communication between mobile terminals, but also make wireless devices access to wired network to obtain the goal of broadband communication and global internetworking, a new field-Wireless Local Area Network (WLAN) has come into being. As the important component to lengthen the communication distance and enlarge the covering area of WLAN, the power amplifier (PA) and antenna functions with more and more significance.This article takes the application of PA and antenna in WLAN as the clue, and makes research and experiment implement of the non-linear distortion occurring in PA and networking antenna technique. The article firstly introduces the linearization techniques: predistortion technique and technique feedforward. It analyses the concept and causes of the nonlinear distortion, and consequently introduces the principle and implement of predistortion and feedforward, and puts forward the innovative project of self-adaptable predistortion and feedforward. Then it gives the circuit design of the PA's application of in WLAN and pays more attention to the linearization. Finally it illustrates WLAN networking antenna technique, analyses the theory basis and WLAN application of it and introduces the present hot technique of smart antenna.On the aspect of PA linearization, a project combining predistortion with feedforward is presented in principle in this article. This project takes the advantage of two techniques and overcomes their defects, which takes effect on PA linearization. On the aspect of networking antenna, this article discusses the application of smart antenna used in WLAN, which makes it meet users' need ingreat area.For the WLAN application more and more widely, people's needs have risen quickly accordingly. The research results of this article has great significance on enlarging Covering Square in WLAN technology, settling with the problem existing in the process of signals transmit and receiving, improving the communication property of WLAN.