摘要
无线通信在现代通信中占据着极其重要的位置,被广泛应用于商业、
气象、军事、民用等领域。无线通信系统由模拟体制不断向数字化体制过
渡,在这期间提出了软件无线电的概念。其中心思想是:构造一个具有开
放性、标准化、模块化的通用硬件平台,将各种功能用软件来完成,并使
宽带A/D和D/A转换器尽可能的靠近天线,以研制出新一代无线通信系
统。选用不同软件模块就可以实现不同的功能,而且软件可以升级更新。
本文是关于IS-95基站收发信机的一个项目,主要内容为在IF频段
对中频信号取样并以全数字的方式实现IS-95的中频系统。
文章对扩频通信、IS-95标准、软件无线电、以及数字信号处理等相
关的知识作了一定的阐述,主要运用软件无线电技术,描述了一个基于
PDC(可编程数字下变频器)和可编程逻辑器件实现的IS-95数字中频系
统,并给出了相应的硬件电路图及其性能分析。
Telecommunication has still held the important status in
modern communication, and has been applied in the fields of
commercial, weather, military and so on. Telecommunication
system has been transformed from analogy system to digital system.
In this period software radio has been raised. Its clou is: building
hardware flat which is opening, standard and modularization,
implementing all the functions with software.
This paper is a research project of Transceivers in an 15-95
base-station. Its main content is about how to treat with the signal
sampling in IF (70MHz) band with digital method completely for
15-95 system.
This context expatiates upon Spread-Frequency
communication, 15-95 standard, software radio and digital signal
process, then describe a IS-95 IF subsystem based on PDC and
CPLD. Besides it shows off the circuit diagrams and system
evaluations.
引文
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