论文部分内容阅读
引言根据数字多媒体广播建设项目的任务要求,北京人民广播电台负责研究在Ⅲ波段多媒体、多频率块的广播播出,以及在北京六环以内构建发射单频覆盖网。为了能够建设这一网络,我们必须了解DAB/DMB广播覆盖的研究实质。研究DAB/DMB广播覆盖实际上是研究信号经过前端编码复用后,无线电波在Ⅲ波段——电视11频道(207MHz—215MHz)以COFDM方式进行传输时在北京城区的覆盖特性。因此,它的特性就是一定频率、一定环境、一定传输方式下的移动通信无线信道衰落特性。本文将利用现有的无线信道仿真模型资源,结合北京地区特有的地理环境,选择一种或几种理论模型,在此基础上,利用MATLAB仿真工具构建无线衰落信道模型,通过实测调整传播信道参数,使仿真的结果符合实际传播情况。
Introduction According to the requirements of the project of digital multimedia broadcasting construction, Beijing People’s Broadcasting Station is responsible for studying the broadcasting and broadcasting of multi-media and multi-frequency blocks in the band III and the construction of transmitting single frequency coverage network within the sixth ring of Beijing. In order to be able to build this network, we must understand the nature of the research on DAB / DMB broadcast coverage. Research DAB / DMB broadcast coverage is actually the study of the signal after the front-end code multiplexing, the radio wave in the Ⅲ band - TV 11 channel (207MHz-215MHz) COFDM transmission mode in Beijing urban coverage characteristics. Therefore, its characteristic is a certain frequency, a certain environment, a certain transmission mode of mobile wireless channel fading characteristics. In this paper, we use the existing wireless channel simulation model resources, combined with Beijing’s unique geographical environment, select one or several theoretical models, on this basis, the use of MATLAB simulation tools to build wireless fading channel model, measured by adjusting the channel parameters , So that the simulation results in line with the actual situation of communication.