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UGC-NET 2018: (Communication Systems) SpeedTest Quiz 18
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Question 1
What would be the bandwidth of the output signal of SSB-AM (USB) modulator illustrated below when the bandwidth of the baseband message signal is 3 kHz and c(t) = 2sin(200 * 103 πt).
Question 2
Let g(t) = p(t) * p(t), where * denotes convolution and p(t) = u(t) − u(t − 1) with u(t) being the unit step function
Amplitude Modulated signal is given as
In the interval 0 ≤ t ≤1. One set of possible values of the modulating signal and modulation index would be
Amplitude Modulated signal is given as
In the interval 0 ≤ t ≤1. One set of possible values of the modulating signal and modulation index would be
Question 3
The following waveform is to be quantized with a maximum of ± 0.5 Volts/sample error. What should be the space between quantization levels.
Question 4
The bit rate of QPSK is 90Mbit/s. The baud rate will be
Question 5
In a Direct Sequence CDMA system the chip rate is 1.2288 ×106 chips per second. If the processing gain is desired to be AT LEAST 100, the data rate
Question 6
In the following figure the minimum value of the constant “C”, which is to be added to y1(t) such that y1(t) and y2(t) are different, is
Question 7
A source generates three symbols with probabilities 0.25, 0.25, 0.50 at a rate of 3000 symbols per second. Assuming independent generation of symbols, the most efficient source encoder would have average bit rate as
Question 8
A source alphabet consists of N symbols with the probability of the first two symbols being the same. A source encoder increases the probability of the first symbol by a small amount ε and decreases that of the second by ε. After encoding, the entropy of the source
Question 9
A random variable X has the following probability distribution
The mean of X is ___________.
The mean of X is ___________.
Question 10
Let X(t) be a wide sense stationary random process with the power spectral density SX(f) as shown in Figure (a), where f is in Hertz (Hz). The random process X(t) is input to an ideal low pass filter with frequency response
H(f) =
As shown in figure (b). The output of the lowpass filter is Y(t)
Let E be the expectation operator and consider the following statements.
I. E(X(t)) = E(Y(t))
II. E(
(t)) = E(
(t))
III. E(
(t)) = 2
Select the correct option:
H(f) =
As shown in figure (b). The output of the lowpass filter is Y(t)
Let E be the expectation operator and consider the following statements.
I. E(X(t)) = E(Y(t))
II. E(
(t)) = E((t)) III. E(
(t)) = 2 Select the correct option:
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