Cellular Telephony: Multi Antenna Techniques
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Questions and Answers

What is the purpose of an encoder in a MIMO system?

  • To amplify the signal before transmission
  • To filter out noise from the signal
  • To decode the received signal
  • To convert the signal into a format suitable for transmission (correct)

    • What is the assumption made about the wireless propagation channel in a MIMO system?

  • It is fast-fading and frequency-flat
  • It is frequency-selective and fast-fading
  • It is quasi-static and frequency-flat (correct)
  • It is static and frequency-selective

    • What type of MIMO channel model is based on electromagnetic wave propagation?

  • Stochastic model
  • Physical model (correct)
  • Analytical model
  • Deterministic model

    • What is the main reason for the difference in performance between AWGN channels and Rayleigh fading channels?

    <p>The fading of the channel</p> Signup and view all the answers

    What is the minimum SNR required to achieve a BER of 10^-4 in AWGN channels?

    <p>10 dB</p> Signup and view all the answers

    What is the role of the transmit antennas in a MIMO system?

    <p>To send the signal through the wireless channel</p> Signup and view all the answers

    What is the principle of diversity in wireless communication systems?

    <p>To ensure that the same information reaches the RX on statistically independent channels</p> Signup and view all the answers

    What is the characteristic of a quasi-static channel?

    <p>The coherence time of the channel is long enough to transmit a large number of bits</p> Signup and view all the answers

    What is the purpose of phase shifting in a MIMO system?

    <p>To make phase correction equal</p> Signup and view all the answers

    What is the effect of fading on the BER in wireless communication systems?

    <p>It makes the BER decrease linearly with the SNR</p> Signup and view all the answers

    What is the purpose of using diversity in wireless communication systems?

    <p>To make sure that the SNR has a smaller probability of being low</p> Signup and view all the answers

    What is the condition required for uncorrelated Rayleigh channels?

    <p>When the antenna spacings and/or the angular spreading of the energy at both sides of the link are large enough</p> Signup and view all the answers

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