DMR同频组网的相干区设计

Design on Interference Area of DMR Simulcast Network

针对数字移动无线电(Digital Mobile Radio,DMR)系统大区制组网存在的局限性,对比了DMR进行多基站组网时异频网络和同频网络两种模式的特点,指出了同频多基站组网的优势和关键技术。通过对同频网络固有的差拍衰落和码间干扰等自干扰问题的分析和研究,根据DMR的基本参数进行了理论计算,提出了减少和消除差拍衰落的方法和措施,并就工程应用中相干区的设计问题给出了相干区的设计原则和建议。

According to the limitation of district area networking in DMR system,comparing with the characteristics of two kinds of modes between multi-frequency network and single frequency network of multisite networking in DMR,this paper describes the advanta-ges and key technologies of multi-frequency multisite networking.Based on analysis and research on self-interference problems of inher-ent beat fading and inter-symbol interference in single frequency network,and according to the theoretically calculating on basic parame-ters of DMR,this paper puts forward the methods and measures to weaken and eliminate beat fading.In addition,aimed at the design problems of interference area in engineering application, this paper also provides the design principles and suggestions of interference area.