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。
S. embassy in Beijing, including the American embassy, is usually small agent stood, can receive the capital city with the shortwave communication antenna.
设于海外的美国使馆，包括驻北京的美国使馆，通常是小型特工站，装有能接收首都城市的短波通讯的天线。
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 existence of dead zone is one of the characteristics of shortwave communication. Conquer it and realization tactics communication is the research topic of this paper.
静区的存在是短波通信的重要特征之一，克服静区，实现战术通信是研究的主题。
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。
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；
Network of the shortwave FH radio is significant in the military communication, also the applications of network can improve the anti-jamming capability of the shortwave FH radio.
短波跳频电台组网在军事通信中占有重要地位，组网应用可以提高跳频电台的抗干扰性能。
From the mode of information transmission, the wireless communication can be classified as long wave, medium wave, shortwave, ultra short wave, and microwave.
无线通信系统按其传播信息的方式，可分为长波、中波、短波、超短波和微波通信方式。
Base on the structure of existing shortwave radios, communication scheme and system structure are designed, and particular functions are assigned to the parts of system.
并根据现有短波电台的结构特点，设计了通信方案和系统结构，并为系统各部分分配了具体功能。
Therefore, it has a practical significance to develop some fit methods of modulation with high spectrum efficiency for shortwave FH communication system.
因而，研究适合于高速数据传输的跳频通信特点且具有高效频谱利用率的调制技术具有重要的实际意义。
The frequency prediction of skywave propagation in shortwave band is the precondition of performance prediction of skywave communication circuit.
短波天波传播频率预测是短波天波通信电路性能预测的前提。
The advantages of strong anti-interference, random address selection make shortwave frequency-hopping (FH) communication have a wide application in the areas of military.
短波跳频通信具有较强的抗干扰能力和任意选址等优点而在军事通信领域得到了广泛的应用。
The advantages of strong anti-interference, random address selection make shortwave frequency-hopping (FH) communication have a wide application in the areas of military.
短波跳频通信具有较强的抗干扰能力和任意选址等优点而在军事通信领域得到了广泛的应用。
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