在大信噪比条件下为了降低接收系统的复杂度，2PSK数字调制应该采用包络检波解调方法.
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当2PSK数字调制系统出现相位模糊现象时，误码率公式计算的误码率不再适用。
A. 对
B. 错
What danger did the young bird come across?
Was the mother bird afraid? What did the mother bird do in front of this danger?
How was the danger resolved? What is the conclusion of the story?
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