Digital Modulation schemes

FSK reception is

• Phase Coherent

• Phase non coherent

• Phase Coherent & non coherent

• None of the mentioned

Which is called as on-off keying?

• Amplitude shift keying

• Uni-polar PAM

• Amplitude shift keying & Uni-polar PAM

• None of the mentioned

QAM uses ______ as the dimensions.

• In phase

• Quadrature

• In phase & Quadrature

• None of the mentioned

Which has same probability of error?

• BPSK and QPSK

• BPSK and ASK

• BPSK and PAM

• BPSK and QAM

Which system uses QAM?

• Digital microwave relay

• Dial up modem

• Digital microwave relay & Dial up modem

• None of the mentioned

Modulation process corresponds to ______ the amplitude, frequency or phase.

• Switching

• Keying

• Switching or keying

• None of the mentioned

Matched filter

• Is a non linear filter

• Produces maximum output SNR

• All of the mentioned

• None of the mentioned

Average energy per bit is given by

• average energy symbol/log2 M

• average energy symbol * log2 M

• log2 M/ Average energy symbol

• none of the mentioned

In DPSK technique, the technique used to encode bits is

• AMI

• Differential code

• Uni polar RZ format

• Manchester format

In binary data transmission DPSK is preferred to PSK because

• a coherent carrier is not required to be generated at the receiver

• for a given energy per bit, the probability of error is less

• the 1800 phase shifts of the carrier are unimportant

• more protection is provided against impulse noise