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Alexander Chemeris
smart radio softwareOsmoDevCon
March 2012
UmTRX –a hardware for GSM base station
Alexander Chemeris twitter: @chemeris e-mail: [email protected]
Presentation plan
1. What is UmTRX?
2. Technical details
Alexander Chemeris twitter: @chemeris e-mail: [email protected]
UmTRX
A transceiver for• low-cost,• mid-range,• power-efficientGSM base station
(not a femtocell)
Alexander Chemeris twitter: @chemeris e-mail: [email protected]
Open-Source Hardware
• Editable design files are published
• You're allowed to
o distribute,
o modify,
o manufacture.
Alexander Chemeris twitter: @chemeris e-mail: [email protected]
Purpose and users
• Small/tiny carriers
• Developing regions
• Rural and isolated areas
… to avoid competition with Big Guys
Alexander Chemeris twitter: @chemeris e-mail: [email protected]
Presentation plan
1. What is UmTRX?
2. Technical details
Alexander Chemeris twitter: @chemeris e-mail: [email protected]
UmTRX architecture
1GigE
FPGAXilinx Spartan 6 LX75
Power GPSEB230
1 PPS
Rx
Tx
Rx
Tx
controlcontrol
Ref. Clock
TCXO26 MHz
duplexer +LNA+PA
duplexer +LNA+PA
Flash
LMS6002D
LMS6002D
SP
I
UA
RT
switch
switch
GPIO
GPIO
SRAM
Alexander Chemeris twitter: @chemeris e-mail: [email protected]
UmTRX specification
• Dual TRX
• GPS-locked clock
• 5.25" form-factor
• 3mW output power
• Ethernet connection
15 voice channelscheap Power Amplifiersdiversity receive
no maintenanceno costly OCXO
many enclosuresfits into CD-ROM slot
standard for BTSamplifies to any value
standardreliable
Alexander Chemeris twitter: @chemeris e-mail: [email protected]
LMS6002D
› Single chip transceiver› 375MHz-4GHz.› Programmable bandwidth:
1.5-28MHz› 12-bit ADC and DAC› Tx RF output +6dBm,
continuous wave
and NDA :)
Alexander Chemeris twitter: @chemeris e-mail: [email protected]
Modified UHD firmware & software
Works with
• OpenBTS
• OpenBSC (soon? )
• GnuRadio
Alexander Chemeris twitter: @chemeris e-mail: [email protected]
UmTRX Q&A
smart radio softwareAlexander Chemeris
[email protected]+7 (915) 330-7626
skype: Alexander.Chemeristwitter: @chemeris
Alexander Chemeris twitter: @chemeris e-mail: [email protected]
Mayotte project
Coordinates12 50 S, 45 10 E
Square kilometers of land374 square kilometers
Population200,000*
Telephone lines5.2 per 100 people*
Mobile cellular subscriptions28.0 per 100 people*
* information of World Bank, 2009
Target
low-cost GSM network
affordable communications
uses open-technology
hack & learn
Alexander Chemeris twitter: @chemeris e-mail: [email protected]
About Fairwaves LLC
• Moscow based company, founded in Jan 2011.• Focuses on development of cost-effective mobile access solutions.• Provides software and hardware development services in the area of SDR.• Owns world-leading IP in LDPC error-correcting codes, smart antenna systems
and wavelet filtering of RF signals.• Alexander Chemeris, CEO, holds Master degree in Computer Science and during
last 6 years was involved in various projects on VoIP, video-conferencing and wireless technologies as senior engineer, project manager and consultant, including many open-source projects.
• Prof. Dr. Sergey Portnoy, Chairman of the Board, received doctoral degree in 1992 for his achievements in cascaded modulation and coding schemes, nowadays known as OFDM. For the last 20 years he has been building wireless networks and promoting wireless access in Russia. At this moment he holds positions of WiMAX Forum Regional Director, Chairman of the board of ZAO Cedicom (equipment distribution),VP Strategy of ZAO Antares (emerging LTE operator).