The advantage of $$\frac{\pi}{4}$$ QPSK compared to conventional QPSKis ?

A

$$\frac{\pi}{4}$$ QPSK requires less bandwidth compared to conventional QPSK

B

$$\frac{\pi}{4}$$ QPSKproduces lower envelope variation compared to conventional QPSK

C

$$\frac{\pi}{4}$$ QPSKreceiverdesign is simple compared to» conventional QPSK

D

There is no advantageA movingcoil iron ammeter may be compensated for frequency errors by