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。

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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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