自适应均衡技术在宽带微波传输中的应用

在微波视距通信中通常采用二径模型来描述信道,简要介绍了二径模型的频率响应、损伤参数以及多径时延与天线高度、通信距离的关系。自适应均衡器是对抗多径造成的频率选择性衰落的一种重要手段,简要介绍了自适应均衡器的原理以及设计思路,采用4种典型信道下均衡前后解调器的误码性能对自适应均衡器的抗二径损伤的效果进行评估。测试结果表明,自适应均衡器能有效地对抗二径造成的频率选择性衰落,该均衡器能满足工程使用要求。

Application of Adaptive Equalization Technique in Wide Band Digital Microwave Communication

In microwave horizon communication,a two-ray ground multipath model is often used to describe microwave channel.This paper introduces briefly the frequency response,damage parameter of two-ray multipath model and the relationship between multipath time delay,antenna height and communication distance.Adaptive equalizer is an important means for decreasing the effect of frequency-selective fading caused by mulipth,and the principle and design of adaptive equalizer are briefly introduced and the BER of demodulator in four typical channels is offered to evaluate adaptive equalizer.Results show that adaptive equalizer can decrease the effect of ISI and the present adaptive equalizer can satisfy the requirements of engineering applications.