1
GATE ECE 2000
MCQ (Single Correct Answer)
+2
-0.6
In a digital communication system employing Frequency Shift Keying (FSK), the 0 and 1 bit are represented by sine waves of 10 KHz and 25 KHz respectively. These waveforms will be orthogonal for a bit interval of
A
$$45\,\,\mu \sec $$
B
$$200\,\,\mu \sec $$
C
$$50\,\,\mu \sec $$
D
$$250\,\,\mu \sec $$
2
GATE ECE 1999
MCQ (Single Correct Answer)
+2
-0.6
Four independent messages have bandwidths of 100Hz, 100 Hz, 200Hz and 400Hz respectively. Each is sampled at the Nyquist rate, and the samples are time division multiplexed (TDM) and transmitted. The transmitted sample rate )in Hz) is
A
1600
B
800
C
400
D
200
3
GATE ECE 1996
MCQ (Single Correct Answer)
+2
-0.6
The number of bits in a binary PCM system is increased from n to n+1. As a result, the signal to quantization noise ratio will improve by a factor
A
$$\left( {n + 1} \right)/n$$
B
$${2^{\left( {n + 1} \right)/n}}$$
C
$${2^{2\left( {n + 1} \right)/n}}$$
D
which is independent of n
4
GATE ECE 1992
MCQ (Single Correct Answer)
+2
-0.6
The bit stream 01001 is differentially encoded using 'Delay and Ex OR' scheme for DPSK transmission. Assuming the reference bit as a '1' and assigning phases of '0' and '$$\,\pi $$' for 1's and 0's respectively, in the encoded sequence, the transmitted phase sequence becomes
A
$$\,\pi $$ 0$$\,\pi $$ $$\,\pi $$ 0
B
0 $$\,\pi $$ $$\,\pi $$ 0 0
C
0 $$\,\pi $$ $$\,\pi $$ $$\,\pi $$ 0
D
$$\,\pi $$ $$\,\pi $$ 0$$\,\pi $$ $$\,\pi $$
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