软件无线电台是由不同软件在通用硬件平台上实现无线网络物理层部分或全部功能的无线通信设备。装有软件无线电台的移动终端设备可以接入众多的无线网络，如蜂窝网、无线局域网和卫星系统等。这不仅为实现任意时间、任意地点的无缝连接提供了可能性，而且使用户能根据所处环境，选择最佳性能价格比的无线网络进行通信。文章介绍了软件无线电的核心技术、网络分层模型及其未来应用前景。 Software radio is a wireless communication device that implements some or all of the functions of the physical layer of a wireless network by different software on a common hardware platform. Mobile terminals equipped with software radios have access to a wide range of wireless networks such as cellular, wireless LAN and satellite systems. This not only offers the possibility of seamless connectivity at any time, anywhere, but also allows users to choose the best cost-effective wireless network to communicate with based on their environment. The paper introduces the core technology of software radio, network layered model and its future application prospects.