4 ms·
The problem with QPSK in particular is a loss of phase lock in marginal conditions, or with interference. It would require higher complexity, with no improveme
by Johnythree 4y ago
The problem with QPSK in particular is a loss of phase lock in marginal conditions, or with interference.
It would require higher complexity, with no improvement for marginal signals.
One possible improvement would be "Synchronous AM" (eg 1/2 of a QAM signal) but that will also lose phase lock in weak signal conditions, eg when it is most needed.