Hartley’s Law / Nyquist Theorem:-
Statement: Hartley‟s Theorem/Law states that the channel capacity of the transmission channel of bandwidth „B‟ which carries a signal having „M‟ levels in the total absence of noise is given by:
C = 2 B log 2 M
where, C – channel capacity (bits/sec)
B – channel bandwidth
M – number of coding levels (2 or more)
In the absence of noise, Hartley‟s Law shows that greater the number of levels in the coding system, the greater the information rate that can be sent through the channel.