一个基于软件无线电的智能天线接收系统

智能天线技术是第三代移动通信中的核心技术之一,最初主要应用于雷达和军用抗干扰通信。随着软件无线电技术的发展,采用全数字处理,在基带通过对接收和发送信号的波束赋形,可以极大提高无线通信系统的容量和抗干扰能力。文中在讨论智能天线的基本原理和设计思路的基础上,提出并实现了一个适于扩频通信的智能天线接收系统。系统硬件平台的搭建以及固定波束形成的实现,为以后的软件算法的性能评估打下了基础。

A Smart Antenna Receiver System Based on Software Radio

As one of the key techniques for the 3G mobile communication, smart antenna initially was applied to radar and military anti-jamming communication. With the development of software radio, the signal can be digitized at RF or IF, then be received using digital beamforming in baseband, which can extremely improve the capacity and enhance anti-jamming capability of wireless communication. This paper presents the basic concepts and principles of the smart antenna, discusses the design thought of smart antenna system,and finally proposes a scheme of smart antenna receiver system and realizes a flexible test-bed that can generate fixed beamforming and can be applied to military dispread-spectrum system. Later, the performance of smart antenna algorithms will be evaluated on the hardware test-bed.