What is the difference between QPSK and 4-QAM ?

Thread Starter

yuvi1

Joined Feb 1, 2013
37
hi everyone ...

i have searched over the internet and still i have not found a good explenation.

i know that these two types of modulation give the same result , but the technique is not the same, can someone
please shed some light ?

thanks !
 

alfacliff

Joined Dec 13, 2013
2,458
qpsk is quadrature phase shift keying, the modulation is ecoded with a change in phase. 4 qam is using amplitude modulation in quadrature.
 

Thread Starter

yuvi1

Joined Feb 1, 2013
37
thank guys !

so in qpsk all 4 symbols have the same amplitude and in 4qam all four symbols have difference in phase and amplitude ?
 
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