基于软件无线电的中短波接收机设计

Design on Medium-and-Short Wave Receiver based on SDR

目前广播系统正由模拟体制向数字化体制过渡,数字版权管理(DRM,Digital Radio Mondiale)系统就是针对30 MHz以下频段的数字广播标准。作为软件无线电的核心技术之一,数字接收机技术得到了越来越普遍的应用。介绍了一种基于软件无线电的中短波接收机的硬件系统结构,这种软件无线电接收机结构可以同时解码音频和数据流,兼容目前的模拟调幅广播和数字调幅广播标准。重点讨论了电调滤波器的设计,最后使用EDA软件进行仿真,并给出了仿真结果。

The present broadcast system is transiting from analog system to digital system,and DRM is a digital radio broadcasting standard for the frequency bands below 30MHz.As a key technology of SDR,digital receiver is more and more extensively applied.In this paper,an architecture of SDR medium-and-short wave receiver system is described,which could decode both audio and data streams,and is computable with both analog AM and digital AM broadcast standards.This paper discusses in detail the design of electrically tunable filter.Simulation on the filter with EDA software is done,and the simulation results are given.