STUPIDSID
1 (a)
Explain the function of a bit synchronizer.
5 M
1 (b)
Distinguish between a matched filter and correlator.
5 M
1 (c)
Explain line codes and their characteristics.
5 M
1 (d)
Explain Shanon-Hartley Theorem on channel capacity.
10 M
2 (a)
Explain M-ary FSK Transmitter and Receiver with neat block diagram.
10 M
2 (b)
A Gaussian channel has 2 Mhz bandwidth. Calculate the channel capacity if the signal to Noise Spectral density ratio is 104. Also calculate the maximum information rate.
5 M
2 (c)
Explain systematic and non-systematic error correcting codes.
5 M
3 (a)
Draw and explain the block diagram of non-offect QPSK transmitter and receiver. Also draw output waveform.
10 M
3 (b)
The generator polynomial for a (7,4) cyclic code is
g(x)=1+x2+x3.
i) Draw the block diagram of Encoder and syndrome calculator.
ii) Find the code polynomial of 0110.
g(x)=1+x2+x3.
i) Draw the block diagram of Encoder and syndrome calculator.
ii) Find the code polynomial of 0110.
10 M
4 (a)
A 1/3 rate, k=3 convolutional encoder can be described by the impulse response of the path given by:
g1=101, g2=110, g3=011.
i) Draw the block diagram of encoder.
ii) Draw the code tree and state diagram. Hence find out output sequence if the input to the encoder is 11010.
g1=101, g2=110, g3=011.
i) Draw the block diagram of encoder.
ii) Draw the code tree and state diagram. Hence find out output sequence if the input to the encoder is 11010.
10 M
4 (b)
Draw the signal space diagram of 16 QASK and calculate the Euclidean distance and compare it with 16-PSK.
10 M
5 (a)
Define entropy and Information rate. A source emits symbols with the given probabilities
0.2, 0.25, 0.15, 0.1, 0.15, 0.05, 0.1
calculate:
i) Entropy of source
ii) Huffman code
iii) Code Efficiency
0.2, 0.25, 0.15, 0.1, 0.15, 0.05, 0.1
calculate:
i) Entropy of source
ii) Huffman code
iii) Code Efficiency
10 M
5 (b)
What is equalization. Explain with block diagram a tapped delay line equalizer.
10 M
6 (a)
Consider a (7,4) code whose generator matrix is \[ G= \begin{bmatrix}
1 &1 &1 &1 &0 &0 &0 \\1
&0 &1 &0 &1 &0 &0 \\0
&1 &1 &0 &0 &1 &0 \\1
&1 &0 &0 &0 &0 &1
\end{bmatrix} \]
i) Find the code word for (a) 1101 (b) 1001
ii) Find out the parity check matrix
iii) What is the error detecting and correcting capability of the code.
i) Find the code word for (a) 1101 (b) 1001
ii) Find out the parity check matrix
iii) What is the error detecting and correcting capability of the code.
10 M
6 (b)
Define the expression for
i) Impulse response
ii) Probability of error matched filter.
i) Impulse response
ii) Probability of error matched filter.
10 M
Write short notes an (any two):
7 (a)
Eye pattern
10 M
7 (b)
ISI and ICI
10 M
7 (c)
MSK
10 M
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