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Which one of the following digital modulation schemes has the bit error rate as  ?

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  1. coherent binary PSK
  2. Coherent binary FSK
  3. DPSK
  4. Noncoherent binary FSK

Answer (Detailed Solution Below)

Option 1 : coherent binary PSK
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Detailed Solution

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option 1 is correct

BPSK

S1(t)= Ac cos (2πfc t)

S2(t)= -Ac cos (2πfc t)

Bit error rate (BER) for BPSK given as 

noise power =No/2

bit energy(Eb)=Ac2Tb/2

Relation between Q(x) and erfc are 

Q(x)=1/2 erfc (x/√ 2)

 

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