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Traffic channels in AMPS take up 30 KHz bandwidth. US TDMA technology, also called IS-136, inserts 6 time slots in a frame. How much bandwidth does

  1. Traffic channels in AMPS take up 30 KHz bandwidth. US TDMA technology, also called IS-136, inserts 6 time slots in a frame. How much bandwidth does one slot take up and why?
  2. Describe briefly what are the traffic and the control channels in a cellular system, and what's important about each? Also, are they forward channels or reverse channels?
  3. 64 QAM has a higher BER at given values of Eb/Nsub0 than 16 QAM. Explain     why? And explain which has a higher spectral efficiency
  4. What are some of the negative effects of multipath, and how do they affect wireless systems? How does one offset those effects?
  5. What's the basic principle of MIMO and why is it useful?
  6. What is the advantage of using orthogonal codes?
  7. What is frequency reuse, and why is it important in determining both interference levels and network capacity?
  8. How does the RTS/CTS technique help in doing reliable data delivery in 802.11?
  9. Why have both a centralized and a distributed coordination function in the MAC of 802.11?
  10. Why are there training bits in a US-TDMA or GSM traffic channel slot? 

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