The area spectral efficiency of fully loaded cellular radiocommunicationsystems with variable-rate transmission is investigated.
研究采用可变速率传输的满负荷蜂窝无线通信系统的面积频谱效率。
2
However, for the wireless mobile communicationsystems, the radio channel is frequency selective and time-varying.
对于无线通信系统，无线信道不仅是频率选择性的，而且是时变的。
3
A person trained in this field may need to know how to set up and maintain telephone equipment, voicemail systems, fiber optic and microwave communication links, as well as mobile radio equipment.