本文特别指出，在小信噪比输入的条件下，非相干解调器的“门限效应”严重恶化，甚至使收信机无法工作。

It is emphasized that under some poor SNR conditions, the "threshold effect" of non-coherent demodulator degrades seriously, even causes the receiver to be out of work.

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然而，传统的微弱信号检测方法，输入信噪比门限受到一定限制，很难进一步降低。

However, the traditional weak signal detection method, input signal to noise ratio threshold are subject to certain restrictions, it is difficult to further reduce.

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然而，传统的微弱信号检测方法，输入信噪比门限受到一定限制，很难进一步降低。

However, the traditional weak signal detection method, input signal to noise ratio threshold are subject to certain restrictions, it is difficult to further reduce.

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