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首页> 外文期刊>Microwave and optical technology letters >ON COMBATING DEEP FADES DUE TO GROUND REFLECTION IN POINT-TO-POINT WiMAX COMMUNICATIONS
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ON COMBATING DEEP FADES DUE TO GROUND REFLECTION IN POINT-TO-POINT WiMAX COMMUNICATIONS

机译：点对点WiMAX通信中因地面反射而引起的深度衰减问题

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摘要

In point-to-point wireless communications, the received signal may experience deep fading due to different propagation phenomena. In this paper, we deal specifically with ground reflection and show how it affects the system communication. As application, we consider the example of point-to-point WiMAX communications between base stations (BSs) and trains. The fading problem is mainly due to the fact that both direct and reflected rays are located in the main lobe of the base station antenna and then the correspondant fields have almost the same amplitude. In this paper, we propose several efficient solutions in order to overcome the fading problem. These solutions perform different techniques based, first, on modifying the shape of the main lobe of the BS antenna in order to decrease the magnitude of the ground reflected field, and second, on modifying the antennas polarization. In order to support our propositions, a large set of simulation results is reported and discussed.
机译：在点对点无线通信中，由于不同的传播现象，接收到的信号可能会经历深度衰落。在本文中，我们专门处理地面反射，并说明其如何影响系统通信。作为应用，我们考虑基站（BS）与火车之间的点对点WiMAX通信的示例。衰落问题主要是由于直射和反射射线都位于基站天线的主瓣中，并且相应的场具有几乎相同的幅度。在本文中，我们提出了几种有效的解决方案，以克服褪色问题。这些解决方案首先基于修改BS天线主瓣的形状以减小地面反射场的大小，然后基于修改天线的极化来执行不同的技术。为了支持我们的主张，报告并讨论了大量模拟结果。

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