SRM University 2011 B.Tech Electronics and Communications Engineering Ec0307-digital communication - Question Paper
EC0307-DIGITAL COMMUNICATION SEMESTER ques. PAPER FOR fifth SEMESTER
PART - B (S x 16 - 80 Mark*)
. i, Compare PAM, PWM and PPM
ii. Explain sample and hold circuit.
(OK)
State and prove Low Pass Sampling theorem.
Explain Delta modulation system with transmitter and receiver.
(OR)
A signal of Bandwidth 3.5KHZ the sampled quantized and coded by a PCM system. The coded signal is then transmitted over a transmission channel ot' supporting a transmission rate of 50KHZ per second. Calculate the maximum signal to noise ratio that can be obtained by the system.
i. Write a note on channel noise in PCM system.
Discuss Duobinary signaling and also draw the frequency response of a duobinary conversion filter.
(OR)
Derive an expression of Nyquist criterion of distortionless base band binary transmission.
Write a short note on eye pattern.
Derive an expression for probability of error for BPSK system and also draw the constellation diagram.
it. Compare HtSK, HI'SK anti QISK sign#!1,
15 a The figure given below shows four-sliige feedback shitt register The initial state of the regitter is I (KM). Find the output <tcqucncc of the shitt register.
Output
(OR)
b. With a neat block diagram explain DS-SSHPSK transmitter arid receiver.
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| Earning: Approval pending. |
