Digital Communication Quiz1

Identify the main goal of channel coding in digital communication

• To detect and correct errors in transmitted data

• To maximize the channel capacity

• To increase the transmission power

• To reduce the bandwidth

Calculate the entropy of the source if a message source emits four symbols with probabilities 1/2, 1/4, 1/8, 1/8.

• 1.75 Bits

• 3.75 Bits

• 2.75 Bits

• 4.75 Bits

Choose the correct prefix code from the given options

• {0, 10, 110, 111}

• {0, 1, 00, 11}

• {0, 01, 011, 0111}

• {1, 10, 100, 1000}

Identify the entropy of a discrete random variable represent in the context of a source of information?

• The average information content per source symbol

• The measure of noise in the communication channel

• The total number of possible symbols

• The probability of the most likely symbol

Calculate the average codeword length, for a binary code of lengths {2, 2, 3} and probability {0.4, 0.4, 0.2}.

• 2.2 bits

• 3.4 bits

• 3.6 bits

• 2.9 bits