软件无线接收数字前端的实现

Implementation of Digital Front-end in Receiving Based on Software Defined Radio

基于软件无线电(SDR)基本思想,提出数字前端概念,对数字前端的组成、功能和基于CORDIC算法的数字下变频、多速率滤波等关键技术进行了介绍。设计了一种软件无线电接收系统,实验表明该设计方案扩展性和移植性好,技术性能达到要求。仿照GSM接收系统技术参数,设计了多速率滤波器,仿真表明,数字前端采用多速率滤波器,能节省成本。对SDR的发展进行了展望。

The concept of digital front-end based on Software Defined Radio（SDR） is put forward. This paper introduces composition and functions of digital front-end and much key technology to digital down conversion based on CORDIC and multi-rate filtering etc. The receive system based on software defined radio is designed. Experimental results illustrate that the design has good expansibility and portability and the performance can satisfy the requirements. The multi-rate filter is designed according to GSM receive system＇s parameter, Simulation results show that the cost is saved when multi-rate filter is used in digital front-end. At last, the development of SDR is mentioned.