The ionosphere is used by the shortwave communication as the relay station for the electromagnetic paths.
短波通信以电离层作为其主要的中继系统。
People show great interest in shortwave communication for its special merits such as flexibility, not easily be destroyed and long propagation distance.
短波通信以其机动灵活、抗毁性强、通信距离远等特殊的优点重新引起人们的研究兴趣。
In modern shortwave communication systems, the channels are mostly frequency-selective, multipath transmission causes the coherent attenuation 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。
In shortwave communication system, Intersymbol Interference is serious and signal is distorted extremely because of fading channel resulted in by the effect of multipath.
在短波通信系统中，由于多径效应常常引起信道衰落，直接结果是码间串扰非常严重。
The authors propose a method of using transmit narrow-beam to spatially concentrate the radiation energy on dominant path and suppress undesired paths in the shortwave communication.
提出在短波通信中利用发射端窄波束，在空间上将能量集中于主路径且抑制其他路径来改善多径信道环境；
Shortwave communication plays a vital role in long haul communications, on account of its unique merits such as low cost, convenience to be generated and strong resistance to damage.
短波通信具有成本低、架设灵活、抗毁能力强等优点，在远距离通信中起着举足轻重的作用。
Shortwave communication plays a vital role in long haul communications, on account of its unique merits such as low cost, convenience to be generated and strong resistance to damage.
短波通信具有成本低、架设灵活、抗毁能力强等优点，在远距离通信中起着举足轻重的作用。
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