非理想因素一般是使误码率变坏，但有时，如视频波形的限幅，在一定条件下竟能得到比理想情况更好的误码率。
In some cases, however, such as the clipping of the video waveform, the bit error rate under certain conditions can be lower than under ideal conditions.
限幅法是目前应用较为广泛的一类预畸变峰均比抑制算法，但其会引入额外的限幅噪声，从而对数据信号和导引符号造成干扰，恶化传输性能。
Clipping is a popular method to control the PAPR with distortions, but it introduces additional clipping noise, so as to distort the data and pilot symbols and degrade the system performance.
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