In fact, it's going to take some time for my hand to go from the high value
down to the low value.
So the trajectory is not going to be this kind of instantaneous
up here and then instantaneous down here, but it's going to take some time.
And so the actual trajectory in my hand is going to look something like this, going up and down more smoothly.
And so because of that, what's actually received at the other end
by the receiver is not going to be quite the same.
And we're going to then have a waveform, or a system, that looks like this.
Where we have set bit sequences that are encoded,
ideally as a waveform like this.
But actually, when it gets received by the receiver looks slightly different.
And because of the fact that those two things look slightly different,
the receiver is going to have to try to figure out
from that what the actual sent bits were.
But because the two waveforms aren't exactly the same,
it's not going to be able to always do a exact job of doing that.
And there may be errors, indicated here by the fact
that I used b tilde instead of b0.
But of course, what we'd like, and we'll be studying in
this class is, how to make those differences between b0 and
b0 tilde, what's received, as small as possible.