【作者】 朱丹；

【导师】 陶成；

【作者基本信息】 北京交通大学 ， 通信与信息系统， 2007， 硕士

【摘要】 双向塔顶放大器能实现上下行信号覆盖范围同时增大,是为解决移动通信系统边缘区域覆盖而设计的全新的基站延伸覆盖和网络优化设备,必然成为3G网络的基本配置。本文以800MHz CDMA双向塔顶放大器的实际应用为背景,研究了双向塔顶放大器的结构与其在无线网络优化中的作用,并且重点研究了接收机前端基于E-PHEMT(增强模式伪形态高电子迁移率晶体管)的低噪声放大器的设计以及双向塔顶放大器实时数据的采集和控制系统的设计。针对低噪声放大器实际工程中噪声、线性和匹配等性能要求,通过使用射频电路CAD软件先进设计系统(ADS)进行完整的分析与仿真,设计并实现了平衡结构、增益可调、噪声系数低、高线性度和可靠性高的低噪声放大器。采用自带模数转换功能的AVR单片机实现实时数据采集和控制系统的设计,完成了所选单片机外围硬件电路和采样电路的设计以及编程实现。为了用户直观简便地监控系统,利用Microsoft Visual Basic(VB)工具设计了可视化控制界面,与单片机系统通过RS-232串口进行通信,完成了系统参数设置、实时参数显示和报警指示功能。更多还原

【Abstract】 Dual Channel Booster can enlarge the coverage range of both uplink and downlink signals simultaneously, and it is a new kind of network optimization equipment for solving the problem of margin area coverage of mobile communication system. It must be an elementary configuration of 3G network.With the purpose of practical application of 800MHz CDMA dual channel booster, this thesis expounds the structure of the booster and its effect in wireless network optimization. Also, we focus on the design of low noise amplifier based on E-PEMT in the forepart of the receiver and the design of real-time informationsampling and control system. According to the demand of noise, linearity and impedance matching in the design process, it is used the radio-frequency circuit CAD software named Advanced Design System for complete analysis, and we design a reliable low noise amplifier, which has balance structure, adjustable gain, low noise figure and high linearity.It is used the AVR microchip ATmega8 to design the real-time information sampling and control system, and we has completed the hardware design including peripheral configuration and sampling circuit and program design. In order to monitor the system directly and simply, it is used Microsoft Visual Basic tools to design a visual control interface communicating with microchip system through RS-232 port, and it implements three functions including parameter setup, real-time information display and alarm indication.更多还原