Open source 4G radio

4,525 views

Published on

Slides for my lecture at CCCamp'11 (http://events.ccc.de/camp/2011/Fahrplan/events/4446.en.html)

Published in: Technology, Education
0 Comments
2 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
4,525
On SlideShare
0
From Embeds
0
Number of Embeds
9
Actions
Shares
0
Downloads
74
Comments
0
Likes
2
Embeds 0
No embeds

No notes for slide

Open source 4G radio

  1. 1. Open-source 4G radio:Its time to start WiMAX and LTE hacking Alexander Chemeris
  2. 2. Disclaimer Im not an expert, Im a hacker.Alexander Chemeris @chemeris Alexander.Chemeris@gmail.com
  3. 3. Im hacking WiMAX. You should too.Alexander Chemeris @chemeris Alexander.Chemeris@gmail.com
  4. 4. Mobile WiMAX ● Standardized by WiMAX Forum ● Air interface - a profile of IEEE 802.16- 2009 OFDMA mode. ● IEEE 802.16 — http://goo.gl/SUpqE ● WiMAX profies — http://goo.gl/k1xjK ● Deployed release 1.5. ● Core network - IETF protocolsAlexander Chemeris @chemeris Alexander.Chemeris@gmail.com
  5. 5. Mobile WiMAX vs LTE Mobile WiMAX ● developed by Internet Providers community ● «evolution of WiFi» ● appeared first LTE ● developed by telecom community ● based on WiMAX ideas ● but with other patentsAlexander Chemeris @chemeris Alexander.Chemeris@gmail.com
  6. 6. Orthogonal frequency-division multiplexing (OFDM) Refer to "Intuitive Guide to Principles of Communications" Tutorial 22 - Orthogonal Frequency Division Multiplex (OFDM, DMT): http://www.complextoreal.com/chapters/ofdm2.Alexander Chemeris @chemeris Alexander.Chemeris@gmail.com
  7. 7. OFDMA (frequency) combined user 1 user 2 user 3 user 4 frequencyAlexander Chemeris @chemeris Alexander.Chemeris@gmail.com
  8. 8. OFDMA (time and frequency)Alexander Chemeris @chemeris Alexander.Chemeris@gmail.com
  9. 9. TDD and FDD Frequency Division Time Division Duplexing (FDD) Duplexing (FDD) default DL DL DL UL DL ULfrequency UL UL radio radio radio radio frame frame frame frame timeAlexander Chemeris @chemeris Alexander.Chemeris@gmail.com
  10. 10. WiMAX frameAlexander Chemeris @chemeris Alexander.Chemeris@gmail.com
  11. 11. WiMAX frameAlexander Chemeris @chemeris Alexander.Chemeris@gmail.com
  12. 12. OFDMA frameAlexander Chemeris @chemeris Alexander.Chemeris@gmail.com
  13. 13. Mobile WiMAX ● Many bands, mostly 2 GHz — 5 GHz ● Scalable bandwidth: 1.5 MHz — 20 MHz ● Usually TDD ● Supports various MIMO and beam-formingAlexander Chemeris @chemeris Alexander.Chemeris@gmail.com
  14. 14. LTE differences ● Uplink uses SC-FDMA for power efficiency ● Power efficient synchronization ● More dynamic parameters at PHY level ● Hierarchical telecom-like protocol For details: http://goo.gl/HAAgmAlexander Chemeris @chemeris Alexander.Chemeris@gmail.com
  15. 15. wimax-scanner ● Mobile WiMAX receiver ● LGPL ● Matlab code for broadcast decoding ● Wireshark for MAC layer decoding http://code.google.com/p/wimax-scannerAlexander Chemeris @chemeris Alexander.Chemeris@gmail.com
  16. 16. wimax-scanner ToDo ● Port to C(++) ● Improve algorithms in Matlab ● More WiMAX recordings ● More WiMAX recordings in MIMO mode ● Transmitter side http://code.google.com/p/wimax-scannerAlexander Chemeris @chemeris Alexander.Chemeris@gmail.com
  17. 17. Other open-source 3G&4G UMTS and LTE implementations in GPL http://www.openairinterface.org ● Closed style development ● Targets academia ● Hackers should engageAlexander Chemeris @chemeris Alexander.Chemeris@gmail.com
  18. 18. Alexander ChemerisAlexander.Chemeris@gmail.com twitter: @chemeris Radio Village local GSM: 901138

×