Digital Communications Laboratory Viva Questions - Part 6

Theory_Questions:

1. The binary data are transmitted over a microwave link at the rate of 10⁶ bits per second. This data is transmitted using 4-PSK modulation scheme what is the required channel bandwidth
   1. 1 MHz
   2. 0.5 MHz
   3. 0.25 MHz
   4. 0.7 MHz

Digital Communications Laboratory Viva Questions - Part 4

Theory_Questions:

1. The channel matrix is represented as then the channel is

1. Binary Symmetric channel
2. Binary channel
3. Binary erase channel
4. All the above

Digital Communications Laboratory Viva Questions - Part 5

Theory_Questions:

1. Two binary random variables X and Y are distributed according to the joint distributions p(X=0, Y=0) =P(X=0, Y=1) =P(X=Y=1) = 1/3 Calculate Entropy of Random Variable X.

1. 0.82
2. 0.72
3. 0.92
4. 0.80

Digital Communications Laboratory Viva Questions - Part 3

Theory_Questions:

1. The bandwidth of TV video plus audio signal is 4.5MHz. If the signal is converted to PCM bit stream with 1024 quantization levels, the number of bits/sec generated by the PCM system will be________. (Assume the signal is sampled at the rate of 20% above the nyquist rate).

1. 108*10⁶ bits/sec
2. 72*10⁶ bits/sec
3. 54*10⁶ bits/sec
4. 90*10⁶ bits/sec
   
   

Digital Communications Laboratory Viva Questions - Part 2

Theory_Questions:

    Two Signals x1(t) = sink(200t) and x2(t)=sinc(400t) then find the Nyquist rate of [x1(t)* x2(t)]

(A).200Hz.

(B).400Hz.

(C).100Hz.

(D).300Hz.