Energy and Power of Signals
Periodic signals are power signals; nonperiodic signals (pulses) are energy signals. When both power and energy are infinite, the signal is neither a power nor an energy signal. As a matter of fact, a true power signal cannot exist in the real world because it would require a power source that operates for an infinite amount of time.
To calculate energy:
To calculate power:
B. P. Lathi, Modern Digital and Analog Communication Systems, 3rd ed., New York: Oxford University Press, 1998.