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Firstly, this paper describes basic parameters of the wireless radio channel and proves that AM broadcast channel is weak spread channel. A wireless Raleigh channel model is given in this part. 本文首先描述了表征无线广播信道的基本参数，证明了调幅广播信道是弱扩展信道，并给出了无线瑞利信道的仿真模型。
Firstly, this paper describes the essential features of DRM, gives an introduction to its key techniques, testifies that the AM broadcast channel is weak extended channel, and brings forward its own channel model. 论文首先描述了数字调幅广播的基本特征，介绍了其关键技术，证明了调幅广播信道是弱扩展信道，并给出了DRM的信道模型。
The chairman's speech will be broadcast nationwide. 主席的讲话将向全国广播。
The speech will be broadcast nationwide. 这次讲话将在全国广播。
This programme is being broadcast in stereo. 这一节目正用立体声播出。
The news headlines are broadcast on the half hour. 新闻提要每到半小时正时作一次广播。
This program is being broadcast in stereo. 这个节目正用立体声播放。
The concert was broadcast by relay. 这场音乐会是实况转播的。
The ceremony will be broadcast live on television. 这个议事会在电视上直播的。
The President's speech was broadcast nationally. 总统的演说在全国广播。
The concert will be broadcast live. 这次演唱会将进行实况转播。
Will be broadcast for one year and four months. 将播出一年零四个月。
The meeting will be broadcast live. 会议会现场直播。
Which channel will you be broadcasting on tonight? 你今晚在哪个频道广播?
To broadcast or be broadcast by radio. 用无线电广播或用无线电被广播
Beijing TV (BTV-3) tomorrow will be broadcast live. 北京电视台（BTV-3）明晚将进行现场直播。
The foodball game will be broadcast on CCTV. 中央电视台将转播那场足球赛。
The concert will be broadcast live on TV. 这场音乐会将在电视上现场直播。
The match will be broadcast live. 这场比赛将作实况转播)。
Second, ESTELLE, one of formal description technique, is extended to broadcast channel for description power. 第三章和第四章主要介绍了ESTELLE为代表的形式化描述技术。针对ESTELLE描述通道的局限性,给出了一个描述广播通道的扩展;