OsmoDevCon
smart radio software
March 2012
UmTRX –
a hardware for GSM base station
Alexander Chemeris
Presentation plan
1. What is UmTRX?
2. Technical details
Alexander Chemeris
twitter: @chemeris
e-mail: Alexander.Chemeris@fairwaves.ru
UmTRX
A transceiver for
• low-cost,
• mid-range,
• power-efficient
GSM base station
(not a femtocell)
Alexander Chemeris
twitter: @chemeris
e-mail: Alexander.Chemeris@fairwaves.ru
Open-Source Hardware
•
Editable design files are published
•
You're allowed to
o distribute,
o modify,
o manufacture.
Alexander Chemeris
twitter: @chemeris
e-mail: Alexander.Chemeris@fairwaves.ru
Purpose and users
•
Small/tiny carriers
•
Developing regions
•
Rural and isolated areas
… to avoid competition with Big Guys
Alexander Chemeris
twitter: @chemeris
e-mail: Alexander.Chemeris@fairwaves.ru
Presentation plan
1. What is UmTRX?
2. Technical details
Alexander Chemeris
twitter: @chemeris
e-mail: Alexander.Chemeris@fairwaves.ru
UmTRX architecture
Ref. Clock
GPS
EB230
Power
control
SPI
UART
control 1 PPS
TCXO
26 MHz
GPIO
Rx
switch
LMS6002D
Tx
duplexer
+LNA+PA
GPIO
1GigE
FPGA
Xilinx Spartan 6 LX75
LMS6002D
Tx
switch
duplexer
+LNA+PA
SRAM
Flash
Alexander Chemeris
Rx
twitter: @chemeris
e-mail: Alexander.Chemeris@fairwaves.ru
UmTRX specification
• Dual TRX
15 voice channels
cheap Power Amplifiers
diversity receive
• GPS-locked clock
no maintenance
no costly OCXO
• 5.25" form-factor
many enclosures
fits into CD-ROM slot
• 3mW output power
standard for BTS
amplifies to any value
• Ethernet connection
Alexander Chemeris
standard
reliable
twitter: @chemeris
e-mail: Alexander.Chemeris@fairwaves.ru
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: Alexander.Chemeris@fairwaves.ru
Modified UHD firmware & software
Works with
•
OpenBTS
•
OpenBSC (soon? )
•
GnuRadio
Alexander Chemeris
twitter: @chemeris
e-mail: Alexander.Chemeris@fairwaves.ru
UmTRX Q&A
Alexander Chemeris
twitter: @chemeris
e-mail: Alexander.Chemeris@fairwaves.ru
smart radio software
Alexander Chemeris
Alexander.Chemeris@fairwaves.ru
+7 (915) 330-7626
skype: Alexander.Chemeris
twitter: @chemeris
Mayotte project
Coordinates
12 50 S, 45 10 E
Square kilometers of land
374 square kilometers
Target
low-cost GSM network
affordable communications
Population
200,000*
uses open-technology
Telephone lines
5.2 per 100 people*
hack & learn
Mobile cellular subscriptions
28.0 per 100 people*
* information of World Bank,
2009
Alexander Chemeris
twitter: @chemeris
e-mail: Alexander.Chemeris@fairwaves.ru
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, videoconferencing 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).
Alexander Chemeris
twitter: @chemeris
e-mail: Alexander.Chemeris@fairwaves.ru