umtrx – an open-source, budget-friendly hardware for gsm and … · alexander chemeris twitter:...

Alexander Chemeris

GSM re-invented

UmTRX –an open-source,

budget-friendly hardware for GSM and more

GnuRadio ConferenceSept 2012

Alexander Chemeris twitter: @chemeris e-mail: [email protected]

Presentation plan

1. What is UmTRX?

2. Technical details


UmTRX

A transceiver for• low-cost,• mid-range,• power-efficientGSM base station

(not a femtocell)

UmTRXv1 prototype


UmTRX – an SDR transceiver

• two TDD/FDD channels

• 300MHz – 3.8GHz tuning range

• up to 28MHz bandwidth

• 1GbE external interface

• GPS stabilized clock

• industrial grade

And completely open-source


Open-Source Hardware

• Editable design files are published

• You're allowed to

o distribute,

o modify,

o manufacture.


Hackable into:

• LTE & WiMAX

• DVB-T & DAB

• Satellite communication

• CDMA & W-CDMA

• Cognitive Radio & TV White Spaces

You add more.


UmTRX revisions so far

● an amplifier for Tx (200mW)● no LNA on Rx● 10x16cm Eurocard form factor● no RF switches on a frontend● newer GPS module (EB-570)● U.FL connectors by default● external front panel connector● tantalum capacitors● 8-28VDC input voltage range

UmTRX v1 - 1st proto

UmTRX v2 - preproduction


Hackable into:

• LTE & WiMAX

• DVB-T & DAB

• Satellite communication

• CDMA & W-CDMA

• Cognitive Radio & TV White Spaces

You add more.


Presentation plan

1. What is UmTRX?

2. Technical details


UmTRX architecture


UmTRXv2


LMS6002D › Single chip transceiver› 375MHz-4GHz.› Programmable

bandwidth: 1.5-28MHz› 12-bit ADC and DAC› Tx RF output +6dBm,

continuous wave

and NDAand open-source friendly!

https://github.com/chemeris/lms6002-documentation


UmTRX GSM architecture

UmTRXx86 PC

RF switch

RF switch

duplexer

duplexer

PAPA

PA

Rx

Rx

Tx

Tx

1GbE


Selectivity improvement frontend


Modified UHD firmware & software

Works with

• OpenBTS

• OpenBSC (very early stage)

• GnuRadio (soon? )


ToDO list

● Better UHD integration

• Cheap GSM Power Amplifier

● Further hardware tweaking

● … more on the issue tracker

Get a deeply discounted UmTRX if you contribute!

GSM re-inventedUmTRX web-site:

http://code.google.com/p/umtrx/

Alexander [email protected]

+7 (915) 330-7626twitter: @chemeris


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


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.• 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).

umtrx – an open-source, budget-friendly hardware for gsm and … · alexander chemeris twitter:...

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