- 页码：第90页 2011-03-20 18:26:20
Bandwidth & Data Rate People always get confused in the difference between the data rate and bandwidth. Some people thought they are two sides of one thing. Actually data rate comes after the bandwidth. Tanenbaum points out:
The range is from 0 to one number and the number is the so called bandwidth. So it exists a question why high frequency signal is easy to be attenuated? One explanation is the higher frequency means the shorter wave length. It is hard for a short wave to get through the relatively long channel. But the bandwidth always effects the data rate. Henry Nyquist derived an equation expressing the maximum data rate for a finite bandwidth [noiseless] channel.
Claude Shannon make a further work and extended it to the case of a channel subject to random noise:
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