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BARC 2018 ECE: Communication Nuclear Quiz 1

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Question 1

A digital communication system uses a repetition code for channel encoding/decoding. During transmission, each bit is repeated three times (0 is transmitted as 000, and 1 is transmitted as 111). It is assumed that the source puts out symbols independently and with equal probability. The decoder operates as follows: In a block of three received bits, if the number of zeros exceeds the number of ones, the decoder decides in favor of a 0, and if the number of one's exceeds the number of zeros, the decoder decides in favor of a 1. Assuming a binary symmetric channel with crossover probability p = 0.1, the average probability of error is

Question 2

An AM signal is represented as

Where

with regards to this signal which of the following statement is true :
1) The spectrum consists of 8 spectral component.
2) The bandwidth of the signal is 20 KHz
3) The total modulated index is 0.707
4) The modulation efficiency is 5

Question 3

A superheterodyne receiver is designed to receive transmitted signal between 5 and 10 MHz. High side tuning is to be used. The tuning Range of the local oscillator fan IF freq. 500 KH₂ would be

Question 4

The input to a quantizer varies from 0 to 4V. If the input to the quantizer lies between 0 to 2V, the output is 1V. If the input to the quantizer lies between 2V to 4 V, the output of the quantizer is 3.5 V.
The minimum and maximum quantization error is

Question 5

In a PAM scheme with M = 16, the minimum transmission bandwidth required to transmit data at a rate of 12000 bits/sec, is ______ Hz (If Nyquist criterion pulses with a roll of factor r = 0.2 are used to transmit data).

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