Single-side band (SSB)transceiver plays an important role in radio communication.

单边带电台在无线通讯方面起着重要的作用。

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Present the SSB modulation and some characters of HF communication.

分析短波通信的特点，了解单边带调制的相关特性；

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SSB signals become very crowed in short-wave frequency range, so a good anti-noise communication receivers is needed to receive SSB signals.

单边带信号在短波频段内十分拥挤，因此要接收单边带信号就需要一个高抗干扰的通信接收机，过去由于器件的落后，直接影响先进方案的实施。

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