Some of the conditions which must be satisfied in a digital communication system are high data rate, high fidelity, low bandwidth, low transmit power and low transmitter and receiver complexity.

Some of the main features which make the transmitter complex are higher clock speed, higher transmit power, directional antennas and need for a linear amplifier.

Matched filter technique is a demodulation process used to increase SNR.

Wired channels are lossy channels.

Ground wave communication can take place in both low frequency and medium frequency bands.

A signal can be recovered from its sampled version by using an ideal low pass filter.

The equivalent temperature is the function of the receiver design and it must be always kept low.

Sampling theorem is used for converting continuous time signal to discrete type signal and vice versa.

A train of pulses with narrow bandwidth is realizable than the impulse train.

Larger bandwidth is available when operating frequency bands are higher.