Structured Sequence

Digital Communications Systems

This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Structured sequence”.

1. Structured sequences are
a) Block codes
b) Convolutional codes
c) Turbo codes
d) All of the mentioned

2. In binary symmetric channel, in the demodulator _____ decision is made.
a) Hard
b) Soft
c) Hard & Soft
d) None of the mentioned

3. In Gaussian channel demodulator ______ decision is made.
a) Hard
b) Soft
c) Hard & Soft
d) None of the mentioned

4. Which decoders are less complex?
a) Soft decision decoder
b) Hard decision decoder
c) Hard & Soft decision decoder
d) None of the mentioned

5. The ratio of redundant bits to data bits is called as
a) Code rate
b) Redundancy rate
c) Symbol rate
d) Transmission rate

6. If the parity bit takes value one then the summation of code-word gives
a) Even result
b) Odd result
c) Even & Odd result
d) None of the mentioned

7. The summation operation is performed using _____ logical operation.
a) EX-OR
b) AND
c) OR
d) EX-NOR

8. The probability of message error is written as
a) Block error
b) Word error
c) Block & Word error
d) None of the mentioned

9. In a real time communication system addition of redundant bits leads to
a) More bandwidth requirement
b) Faster rate of transmission
c) More bandwidth requirement & Faster rate of transmission
d) None of the mentioned

10. Coding gain is defined as
a) Reduction in Eb/N0
b) Increase in Eb/N0
c) Same as Eb/N0
d) None of the mentioned

11. The capacity per cell is ______ Eb/N0.
a) Directly proportional
b) Inversely proportional
c) Double the
d) Half the

Leave a Reply

Your email address will not be published. Required fields are marked *