1
GATE ECE 2015 Set 1
MCQ (Single Correct Answer)
+2
-0.6
A sinusoidal signal of 2 kHz frequency is applied to a delta modulator. The sampling rate and step-size $$\Delta $$ of the delta modulator are 20,000 samples per second and 0.1 V, respectively. To prevent slope overload, the maximum amplitude of the sinusoidal signal (in Volts) is
A
$${1 \over {2\pi }}$$
B
$${1 \over \pi }$$
C
$${2 \over \pi }$$
D
$$\pi $$
2
GATE ECE 2015 Set 1
Numerical
+2
-0
The transmitted signal in a GSM system is of 200 kHz bandwidth and 8 users share a common bandwidth using TDMA. If at a given time 12 users are talking in a cell, the total bandwidth of the signal received by the base station of the cell will be at least (in kHz) ___________________.
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3
GATE ECE 2014 Set 4
Numerical
+2
-0
An M - level PSK modulation scheme is used to transmit independent binary digits over a band-pass channel with bandwidth 100 kHz. The bit rate is 200 kbps and the system characteristic is a raised-cosine spectrum with 100% excess bandwidth. The minimum value of M is ___________________________.
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4
GATE ECE 2014 Set 3
Numerical
+2
-0
In a PCA system, the signal $$m(t) = \{ \sin (100\,\pi \,t)\, + \cos (100\,\pi \,t\} $$ V is sampled at the Nyquist rate. The samples are processed by a uniform quantizer with step size 0.75 V. The minimum data rate of the PCM system in bits per second is________________
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