(Mobile communication channels are extremely random and have extremely poor stability. The propagation of radio waves in mobile channels has large fluctuations and fluctuations in both the time domain and the frequency domain. Therefore, it is very difficult to control the mobile channel. However, it is very important to understand the propagation characteristics of mobile channels. By understanding the propagation characteristics of radio waves, it is possible to take advantage of these propagation characteristics and design a more optimized wireless communication network.)
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