Tag Info

There is subtle point I would like to make; for the transmitter to send $200\cos(1000\pi t)$, the transmitter would need to exist for all time. If the transmission starts at $t = 0$ and ends at $t = t_f$, the ideal transmitter would transmit $$200\cos(1000\pi t)\left[u(t) - u(t - t_f)\right]$$ where $u(t)$ is the unit step function. However, this is ...