This thesis researches some key techniques in digital mid - frequency transceiver under spread spectrum system . a digital mid - frequency spread spectrum transceiver is implemented on fpga , and has been timing - simulated on computer . this thesis firstly summarizes the basic theory of digital mid - frequency and software radio 本文针对扩频体制下的数字中频收发机的关键技术进行了研究，并以此为基础在fpga上实现了一套数字中频扩频收发机，通过了计算机的时序仿真验证。
The theory of wireless power transmission ( wpt ) and wireless communication and the design of wireless transceiver are discussed first . then according to the requirements of the system , a wireless microwave power transmission system operating at the frequency of 8 . 2ghz is outlined and in - detail analysis and parameter computation are carried out 本文首先介绍了无线电能传输( witelesspowertransmission ， wpt )理论、无线通信理论以及无线通信收发机的设计原理，然后根据系统的指标要求，设计了8 . 2ghz微波无线电能传输与通信系统方案，并进行了指标计算与系统分析。
Secondary surveillance radar ( ssr ) is a hot issue in radar signal processing . from traditional ssr to monopulse ssr , a new - style ssr responder which is based on different frequencies transceiver is widely given more attention now . this responder is grounded on mode s ( selective ) technology 二次雷达一直是国内外雷达信号处理领域的研究热点,由传统的二次雷达到单脉冲二次雷达,发展至今,基于模式s技术的一种新型的基于机载异频收发机响应询问的二次雷达正在得到广泛关注。
Research on cmos implementation of wlan transceiver rf front - end is done in this thesis . the transceiver uses the most used super - heterodyne architecture , its rf front - end consists of low noise amplifier , down - converter , up - converter , preamplifier , lo buffer and pll frequency synthesizer 本论文研究无线局域网收发机射频前端的cmos实现，该收发机采用超外差式的拓扑结构，其射频前端主要由低噪声放大器、下变频器、上变频器、末前级、本地振荡信号缓冲器和锁相环型频率合成器等模块组成。
