基于USRP2的TDCS系统设计与实现

摘要

Transform domain communication system (TDCS) technology provides a good transmitting method for cognitive radio (CR) systems because of its agile choice mechanism of frequency. This paper designs and implements a TDCS system of CR based on universal software radio peripheral 2 ( USRP2 ), and presents the flow path of both software and hardware in detail, and the solution to the key problems. It also introduces a fast self-adaption algorithm to restrain the peak-to-average power ratio (PAPR). The hardware simulation results show that this system is available to implement the wireless communication based on the USRP2, which presents foundation to converting the theory study to the practical application of CR, and presents useful example for other designs of wireless communication systems based on USRP2.%变换域通信系统（TDCS）能够通过频谱估计与标记主动避开干扰，为认知无线电（CR）系统的具体实现提供了良好的技术支持。本文基于通用软件无线电外设（USRP2）平台，设计并实现了一个TDCS传输系统，给出了系统的软硬件设计详细流程和关键问题的解决方案，并针对TDCS系统提出了一种快速抑制峰均比（PAPR）的自适应算法。硬件仿真结果表明，本系统能够在USRP2平台上成功实现无线通信的数据传送与接收，为认知无线电由理论研究步向实际应用奠定基础，同时也为其他基于USRP2的无线系统设计提供借鉴。