Final answer:
The power spectral density (PSD) can be derived for different types of line codes, including unipolar, polar, bipolar, and Manchester.
Step-by-step explanation:
The power spectral density (PSD) is a measure of the power distribution of a signal in the frequency domain.
In the context of line coding techniques, the PSD can be derived for different types of line codes such as unipolar, polar, bipolar, and Manchester.
For example, in unipolar line coding, the signal is encoded using a single voltage level, resulting in a PSD with a single peak at the frequency corresponding to the pulse rate.