In modern shortwave communication systems, the channels are mostly frequency-selective, multipath transmission causes the coherentattenuation and symbol interference.
现代短波通信系统，其信道大多数具有频率的选择性，多径传输产生了信号的相干衰落与符号干扰。
2
A new optical attenuation standard device developing based on coherent detection principle is presented.
介绍了一种新的建立在相干检测原理上的光衰减标准。
3
Results showed that the jet flow length, concentration and anti-attenuation of coherent jet oxygen lance were better than that of common oxygen lance.