基于RTAI和Linux的快速实时无线电SDR系统原型设计与实现

Design and implementation of real-time rapid radio prototype for software-defined radio based on real-time application interface and Linux

随着通信标准的发展,针对软件定义无线电(SDR)技术面临的越来越复杂的无线通信算法和有限的硬件性能、计算资源和SDR系统时延之间的矛盾,提高系统实时性尤其是硬实时的实现可以优化计算资源管理,改善SDR系统的实时性能。采用在环快速开发方法,基于模块化设计思想,以Linux-RTAI为SDR平台,Matlab/Simulink/RTW为开发环境,借助通用软件定义无线电外设(USRP2)设计了一个实时快速无线电原型系统。仿真测试表明所设计原型具有良好的硬实时性能和易扩展性,其模块化设计可以进行多种应用扩展,满足数据采集、雷达探测和动作控制等实时性要求比较高的工业应用。

With the evolution of the communication standards,Software-Defined Radio（ SDR） is faced with an increasingly important problem to balance more and more complex wireless communication algorithms with relatively limited processing capability of hardware,the competition for computing resources and the increasing time-delay of SDR system.Implementation of real-time ability especially the hard real-time ability can improve the computing resources management and the performance of the SDR system.The in-loop rapid development method was taken to design a real-time rapid radio prototyping system with the combination of Linux-RTAI（ Real-Time Application Interface） as the SDR platform and Matlab / Simulink / RTW as the control algorithm development environment with the help of Universal Software Defined Radio Peripheral device（ USRP2） based on the thought of module design.A real-time rapid radio prototype was designed successfully and the simulation shows that the prototype system has good hard real-time performance and expansibility.Its modular design can meet the real-time requirements of some industrial applications such as data acquisition,radar detection,motion control and so on.