1
GATE ECE 1989
MCQ (More than One Correct Answer)
+2
-0.6
In binary data transmission DPSK is preferred to PSK because
A
a coherent carrier is not required to be generated at the receiver.
B
for a given energy per bit, the probability of error is less.
C
the 1800 phase shifts of the carrier are unimportant.
D
more protection is provided against impulse noise.
2
GATE ECE 1988
MCQ (Single Correct Answer)
+2
-0.6
The transfer function of a zero - order hold is
A
$${{1 - \exp \left( { - Ts} \right)} \over s}$$
B
$${{1 - \exp \left( { - Ts} \right)} \over s}$$
C
$$1$$
D
$${1 \over {\left[ {1 - \exp \left( { - Ts} \right)} \right]}}$$
3
GATE ECE 1988
MCQ (Single Correct Answer)
+2
-0.6
The message bit sequence input to a DPSK modulator is 1, 1, 0, 0, 1, 1. The carrier phase during the reception of the first two message bits is $$\pi ,\,\,\pi $$. The carrier phase for the remaining four message bits is
A
$$\pi $$, $$\pi $$, 0, $$\pi $$
B
0, 0, $$\pi $$, $$\pi $$
C
0, $$\pi $$, $$\pi $$, $$\pi $$
D
$$\pi $$, $$\pi $$, 0, 0
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