基于USRP2的TDCS系统的设计与实现

摘要

对于变换域通信系统(TDCS)的研究多集中于理论上的仿真验证,而涉及到硬件平台的较少,为此将一种主流的认知无线电平台——USRP2应用到TDCS系统的硬件实现上.首先分析并解决了TDCS系统的基本原理和关键技术,分析了USRP2的基本工作原理,在此基础上设计了一个基于USRP2的TDCS系统,采用Level-2 Matlab S-Function函数编写TDCS系统所需的动态仿真模块库,然后在MATLAB/Simulink环境下搭建了该系统,最后在2台US-RP2之间进行无线数据的收发测试.实验结果表明:文中所设计的基于USRP2的TDCS系统能够实现实际无线信道中信号的准确发射与接收,具有很好的数据传输误码率,实现了TDCS系统的无线通信.%Researches on Transform Domain Communication System (TDCS) are almost confined to theoretical simulation and corroboration,and rarely involve hardware platform.In this paper,firstly,the fundamental and key techniques of TDCS are analyzed,the working principle of USRP2 is introduced; and then a dynamic platform of TDCS based on USRP2 is designed,the dynamic simulation module library of TDCS is compiled by Level-2 Matlab S-Function.Finally,the communication system is set up in the environment of Matlab/Simulink.Signal transmission and reception in actual wireless channel are tested through two USRP2.The results indicate that the TDCS system designed in this paper based on USRP2 can accurately realized signal transmission and reception in actual wireless channel,and has better data transmission error rate.This paper is of a certain value to the practical application of Cognitive Radio technology.