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.
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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