摘要
在超外差技术上发展起来的直接变频技术已经广泛应用于无线通信领域中,这种技术相对于超外差技术的优点在于它可以通过零中频技术避免“镜像频率”干扰,并仅通过一次正交分解本地振荡频率消除“相对相位”的干扰,而且在硬件上更加容易实现.主要介绍直接变频技术如何应用在轻轨车地通信系统中.
Direct Conversion technology, which develops from superheterodyne technology, has been widely used in wireless communications. The advantages of Direct Conversion technology over Super Heterodyne lie in the fact that it can avoid “ Image Frequency interference with the help of its zero intermediate frequency technology and eliminates interference by decomposing the local oscillation frequency through one quadrature, which can be realized on software more easily. This paper mainly introduces the ways to apply direct frequency conversion the monorail. in the vehicle-ground communication system of the monorail.
出处
《重庆工学院学报》
2005年第8期68-71,共4页
Journal of Chongqing Institute of Technology
关键词
超外差式接收器
直接变频技术
车地通信
Super Heterodyne Receiver
Direct Frequency Conversion
vehicle-ground communication
