The frequency synthesizer is a kind of discrete frequency singal generator with high stability, and it is widely used in communication, radar, apparatus and navigation system.
频率合成器是一种频率稳定度较高的离散间隔型频率信号发生器，广泛应用在通信、雷达、仪器仪表及导航系统中。
In the communication of multiplex system, the DS signal exists Doppler frequency shift for the high dynamic situation of aerocraft.
在复合系统通信中，飞行器的高动态使扩频信号存在多普勒频移。
Orthogonal frequency division multiplex (OFDM) is suitable for Broadband-satellite mobile communication system with the advantage of robustness to muti-path and high bandwidth efficiency.
正交频分复用(OFDM)技术具有抗多径衰落，频谱利用率高等优点，适合于在宽带卫星通信这种无线环境下进行高速传输。
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