MWC QUIZ 2

Why is a cyclic prefix required in an OFDMA?

• To ensure symbol time is an integer number
  

• To help overcome multipath and ISI
  

• To maintain orthogonality
  

• To make OFDMA scalable

What processing step combines multiple OFDM subcarriers into a single signal for transmission?

• FFT
  

• IFFT
  

• c) RF combining
  

• Channel mapping

What does the DC subcarrier indicate?

• Identity of the cell
  

• Antenna configuration
  

• Center of OFDM channel
  

• Format of data channel

Which of the following is a type of wireless communication?

• LAN
  

• WAN
  

• PAN
  

• All of the mentioned

MIMO is a smart antenna technology.
True/false

in MIMO which factor has the greatest influence on data rates

• size of the antenna

• height of the antenna

• number of transmitting antennas

• none

OFDM is a technique of
1.encoding digital data
2. multiple carrier frequencies
3. wide band digital communication
4. 4G mobile communication

• 1,2 and 3 are correct
  

• 2 and 3 are correct
  

• 1, 2 and 4 are correct
  

• All the four correct

MIMO stands for

Which of the following is not a channel parameter?

• Coherence time
  

• Rms delay spread
  

• Doppler spread
  

• Bandwidth

Which of the following is a universally adopted shape of cell?

• Hexagon
  

• Square
  

• Circle
  

• Triangle