26 GHz波段本地多点分配业务无线系统雨衰特性分析

Characteristic analysis of rain attenuation in 26 GHz LMDS wireless system

分析了雨衰效应对26 GHz波段LMDS系统无线链路通信质量的影响。提出了抗雨衰的有效措施。首先从理论上分析雨衰的成因,建立雨衰对系统影响的数学模型及雨衰效应下系统有效路径的计算方法,然后结合各个设备厂商的LMDS系统的特点提出有效的抗雨衰方法,最后进行网络测试论证。测试系统在降雨过程中,无线链路性能稳定,抗雨衰措施完备,满足设计要求。证实了雨衰理论分析的正确,抗雨衰措施的合理。

The effect of rainfall causes reduction in link reliability of 26 GHzLMDS systemsis investigated. The method helpful to reduce the effect of rain fading is recommended based on the theory analysis. First, we analysis the rain attenuation origin, establishthe estimation formula of rain fadingeffect modeling and effective pathcalculationmethods. Then, the effective methods reducing rain attenuation are gave in consideration ofthe advantages of different equipments in different factory. Finally, the testing LMDS network is constructed and the theory is demonstrated based on this network. The tested system has good performancein radio link stability and effective resistance measures to rain attenuation. This network has achieved the designed target. It also testified that the theory analysis to rain attenuation is correct and the methods to reduce rain fading influences are reasonableand effective.