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Open source 4G radio

Open source 4G radio



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

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



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    Open source 4G radio Open source 4G radio Presentation Transcript

    • Open-source 4G radio:Its time to start WiMAX and LTE hacking Alexander Chemeris
    • Disclaimer Im not an expert, Im a hacker.Alexander Chemeris @chemeris Alexander.Chemeris@gmail.com
    • Im hacking WiMAX. You should too.Alexander Chemeris @chemeris Alexander.Chemeris@gmail.com
    • 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
    • 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
    • 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
    • OFDMA (frequency) combined user 1 user 2 user 3 user 4 frequencyAlexander Chemeris @chemeris Alexander.Chemeris@gmail.com
    • OFDMA (time and frequency)Alexander Chemeris @chemeris Alexander.Chemeris@gmail.com
    • 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
    • WiMAX frameAlexander Chemeris @chemeris Alexander.Chemeris@gmail.com
    • WiMAX frameAlexander Chemeris @chemeris Alexander.Chemeris@gmail.com
    • OFDMA frameAlexander Chemeris @chemeris Alexander.Chemeris@gmail.com
    • 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
    • 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
    • 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
    • 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
    • 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
    • Alexander ChemerisAlexander.Chemeris@gmail.com twitter: @chemeris Radio Village local GSM: 901138