每个子信道上的比特取决于该子信道的信噪比。
The number of bits on each subchannel depends on the Signal-to-Noise Ratio of the subchannel .
对于多载波系统，载波频率的偏移会导致子信道之间产生干扰。
The offset of carrier frequency can cause interference between subchannels in a multicarrier system.
在远端串扰时，其各子信道仍然存在着较大的频谱重叠，使误码率增加。
However, in far-end crosstalk, its sub-channels exist still a lot of frequency spectrum overlapping and increase error-rate.
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