Digital Communications Quiz

Probability of error for QPSK technique is

• erfc (EbNo)

• 12erfc (EbNo)

• 12erfc (Eb2No)

• None of the above

Matched filter

• Is a non-linear filter

• Produces maximum output SNR

• All of the mentioned

• None of the mentioned

Base band signal receiver is also called as Integrate and Dump filter receiver.

• True

• False

Which has same probability of error?

• ASK and FSK

• ASK and PSK

• PSK and FSK

• None of the mentioned

Which of the following relation is correct for average of Mutual Information I(X, Y)

• H(X) + H(Y) - H (X, Y)

• H(X) + H(Y) + H (X, Y)

• H(X) - H(Y) - H (X, Y)

• H(X) - H(Y) + H (X, Y)

Information rate is defined as

• Information per unit time

• Average number of bits of information per second

• r.H, r- sampling rate and H- entropy

• All of the above

Information content of an event is directly proportional to its probability of occurrence.

• True

• False

Channel capacity is _________________ proportional to Bandwidth.

• Inversely

• Directly

Efficiency of Source coding for Partitioning / Reduction value M=2 is

• H(X)/2L

• H(X)/L

• 2.H(X)/L

• H(X)/4L

Entropy of N random variables is the _____ of the entropy of individual random variable.

• Sum

• Product

• Sum of squares

• Average