PPM is a pulse modulation technique
that uses pulses that are of uniform height and width
but displaced in time from some base position according to
the amplitude of the signal at the instant of sampling.
PPM is also sometimes known as pulse-phase
modulation. PPM has the advantage over pulse
amplitude modulation (PAM) and pulse duration modulation (PDM) in that
it has a higher noise immunity since all the receiver
needs to do is detect the presence of a pulse
at the correct time; the duration and amplitude of the
pulse are not important.
Other topics in our resources on Communications Systems related to PPM include: