1. Channel capacity

Channel capacity is the maximum data transmission rate that can be achieved on a given communication path under given conditions. The unit is bit/s.

So it can also be understood as bit maximum transmission rate.

Here the given conditions are: bit error rate, channel bandwidth, signal-to-noise ratio.

2. Calculate the channel capacity

Nyquist (ideally, that is, no noise interference)

Nye's criterion: under ideal conditions, both a noiseless, bandwidth of W Hz channel, the transmission rate of up to 2W baud

Note that the transmission rate here is the rate of transmission of the codeword. If the transmission rate is greater than the maximum limit, inter-code crosstalk will occur and the signal will be distorted.

The Nyquist formula above is ideal, there is no noise, but the real situation is not satisfied, all u have the following Shannon formula

3, signal-to-noise ratio

Generally given the channel's signal-to-noise ratio in decibels (dB), you can find out through the signal-to-noise ratio formula for S/N, brought into the Shannon formula to find out the maximum - channel ratio.