This is from the Shannon-Hartley theorem, the 'power limited case': https://en.wikipedia.org/wiki/Shannon%E2%80%93Hartley_theorem#Power-limited_case https://en

This is from the Shannon-Hartley theorem, the 'power limited case': https://en.wikipedia.org/wiki/Shannon%E2%80%93Hartley_theorem#Power-limited_case https://en.wikipedia.org/wiki/Shannon%E2%80%93Hartley_theore...