A solution is to use a low - pass filter to eliminate frequencies higher than the nyquist rate 解决办法是用低通滤波器滤除高于奈奎斯特频率的成分。
2.
The system can make the total signaling rate very close to the nyquist rate of given frequency band through the use of a lot of subchannels 该系统利用大量的子信道使得总的信号速率能够非常接近给定频带的奈奎斯特速率。