Modulation Techniques in Wireless & Mobile Systems Quiz
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Questions and Answers

In a CDMA system, what property do the codes Ci' and Cj' satisfy?

  • Power control
  • Frequency hopping
  • Orthogonality (correct)
  • Spread spectrum

    • Which process involves spreading a data signal by a code signal to result in a message signal?

  • Power control
  • Frequency hopping
  • Direct Sequence Spread Spectrum (correct)
  • Walsh Codes

    • What is the purpose of Direct Sequence Spread Spectrum (DSSS)?

  • Data encryption
  • Frequency modulation
  • Signal spreading (correct)
  • Power distribution

    • Which term refers to the codes that are used as Orthogonal Codes in wireless systems?

    <p>Walsh codes</p> Signup and view all the answers

    What is the primary function of Walsh Codes?

    <p>Code spreading</p> Signup and view all the answers

    Which technique involves changing frequencies many times per second to avoid interference?

    <p>Frequency hopping</p> Signup and view all the answers

    'Spreading of data signal by the code signal' is a key concept in which spread spectrum technique?

    <p>Direct Sequence Spread Spectrum</p> Signup and view all the answers

    'Power frequency' is associated with which spread spectrum concept?

    <p>Direct Sequence Spread Spectrum (DSSS)</p> Signup and view all the answers

    'Signal m(t)' and 'Code c(t)' are involved in which spread spectrum technique?

    <p>'Walsh coding'</p> Signup and view all the answers

    'Wal (0, t)', 'Wal (1, t)', 'Wal (2, t)' are examples of what type of codes?

    <p>'Orthogonal codes'</p> Signup and view all the answers

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