CDMA 2000 A technology review

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CDMA 2000 A technology review

• - Vijayant Bhatnagar

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Brief Overview

• CDMA 2000 1x
• Designed to operate at 400 MHz, 800MHz, 900 MHz,
  1700 MHz, 1800 MHz, 1900 MHz, 2100 MHz.
• Services upto 140kbps peak rate (in theory).
• 1.25 MHz Channel Bandwidth is allocated.
• 64 additional traffic channels have been
  introduced.
• P_REV 6
• CDMA 2000 1xEV-DO
• Data speed of 2.4Mbit/s !
• CDMA 2000 1xEV-DV
• Speed ranging from 3Mbps to 5Mbps.

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Why CDMA?

• FDMA e.g. AMPS Frequency space
• TDMA e.g. GSM Time space
• CDMA e.g. uses time and frequency space !

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Some brief concepts

• Walsh codes
• Short PN Sequences
• Long PN Sequences
• Code Channels (Logical Channels)
• Forward link Pilot, Sync, Traffic(55), Paging
  (7) IS95A/B
• Reverse Link Access channel, Reverse traffic
  channel.
• The beauty of supplemental channels CDMA 2000

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What can we discuss ?

• What technology helps me to roam without breaking
  my call / when I am idle ?
• Why does my mobile show searching when I Power On
  my mobile ?
• How is an SMS based message sent ?
• Is my voice secure in CDMA based system ?
• Why does a CDMA phone have a long battery life ?

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• Where can I find the standard ???
• Layer 1, Layer2 and Layer3. Go to the website
  www.cdg.org.
• Can I study the standard by myself ?
• Yes! Go to cdmaonline.com for good references. I
  am sure you will be guru one day!!!!
• Is there any tool available for simulation ?
• Yes and no! MATLAB and proprietary handsets and
  base stations are required.
• Can I hack somebodys phone ?
• Absolutely! You can even listen to someones
  voice.
• Can I change my ESN ?
• Yes you can. Why not !
• CDMA says no problem to synchronization. Why?
• Codec says Silence ? Its free time.
• Stop counting bars in the phone. Did you ever
  check weather.com for access channels ? Use
  Ec/Io.

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References

• Skillport Website.
• Qualcomm
• CDG (CDMA Development Group)
• 3GPP2 (3rd Generation partnership project)
• www.cdmaonline.com

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THANK YOU!!!!