适于电视广播的毫米波通信

讨论了一种适于新闻报道、实况转播应用的新型毫米波图像传输技术。依据图像质量与图像信噪比之间的关系,对图像传输性能进行了理论计算,并采用低成本新技术完成了实验研究,同时对系统方案、系统中的关键技术等进行了分析,给出了毫米波振荡器、混频器、双工器和天线等毫米波元部件的电气技术指标。该系统成本低,使用方便、灵活,当图像传输质量为4.5级时,系统通信距离大于1 km。

Mm-wave Communication Suited for TV Broadcast

A Ka-band color-TV delivery technique is introduced, which is suited for news reports or live program. Based on the equation of image quality and its signal-to-noise ratio, the fading margin of system is calculated theoretically. System scheme and key technology are recommended. Using state-of-the-art technologies, the demonstrator with low cost isdeveloped, and its behavior is evaluated. Millimeter-wave components applied to this system are described, including oscillator, mixer, antenna and duplexer et al. This demonstrator is low cost, easy to install and convenient to use. The system communication distance exceeds 1 km with image quality of 4.5-class.