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Error Performance MCQs

Practice Error Performance MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1
Communication SystemsError Performance

For binary signaling, bit error rate (BER) is defined as?

  • ANumber of erroneous bits divided by total transmitted or received bits considered
  • BNumber of correct bits divided by bandwidth
  • CCarrier power divided by noise power
  • DSymbols per second divided by bits per symbol
Report an error
Correct Answer: A. Number of erroneous bits divided by total transmitted or received bits considered
Explanation: BER is the fraction of bits detected incorrectly over the observation interval.
Reference: Standard communication systems: error performance
Question 4
Communication SystemsError Performance

Which digital modulation among coherent BPSK and coherent QPSK has the same theoretical BER versus Eb/N0 in ideal AWGN when Gray mapping and coherent detection are used?

  • AQPSK can have the same BER as BPSK
  • BQPSK must always have twice the BER
  • CBPSK always has zero BER
  • DNeither can operate in AWGN
Report an error
Correct Answer: A. QPSK can have the same BER as BPSK
Explanation: Coherent Gray-coded QPSK can be viewed as two orthogonal BPSK channels, giving the same theoretical bit-error performance versus Eb/N0 in ideal AWGN.
Reference: Standard communication systems: error performance