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ttsou, 02/19/2016 10:47 PM


= OsmoTRX =

OsmoTRX is a software-defined radio transceiver that implements the Layer 1 physical layer of a BTS comprising the following 3GPP specifications: * TS 05.01 "Physical layer on the radio path" * TS 05.02 "Multiplexing and Multiple Access on the Radio Path" * TS 05.04 "Modulation" * TS 05.10 "Radio subsystem synchronization"

OsmoTRX is based on the OpenBTS transceiver, but setup to operate independently with the purpose of using with non-OpenBTS software and projects. Currently there are numerous features contained in OsmoTRX that extend the functionality of the OpenBTS transceiver. These features include enhanced support for embedded platforms - notably ARM - and dual channel diversity support for the Fairwaves UmTRX. Most of these features will eventually be merged into mainline OpenBTS, but primary development will occur on OsmoTRX.

Features =Intel SSE Support=
  • SSE3
  • SSE4.1

On Intel processors, OsmoTRX makes heavy use of the Streaming SIMD Extensions (SSE) instruction set. Accelerated operations include pulse shape filtering, resampling, sequence correlation, and many other signal processing operations. SSE3 is the minimum requirement for accelerated use. SSE3 is present in the majority of Intel processors since later versions of the Pentium 4 architecture and is also present on low power Atom processors.

ARM NEON Support
  • NEON
  • NEON-VFPv4

Dual Channel (UmTRX only)

Dual Channel Diversity (UmTRX only)

Low Phase Error Modulator

Hardware support Ettus Research
USRP1
USRP2
B100
B110
B200
B210
N200
N210
E100
E110
Fairwaves
UmTRX
Embedded Platform Support

OsmoTRX has been tested on the following embedded platforms.

Platform Processor FPU
BeagleBoard-xM ARM Cortex-A8 NEON
ArndaleBoard ARM Cortex-A15 NEON-VFPv4
RaspberryPi ARMv6k VFP
Shuttle PC Intel Atom D2550 SSE3
Ettus E100 ARM Cortex-A8 NEON
Status GPRS support Source code

The source code is available from git.osmocom.org (module osmo-trx).

Public read-only access is available via
git clone git://git.osmocom.org/osmo-trx
You can browse it via cgit: http://cgit.osmocom.org/cgit/osmo-trx/

Configuration and Build

The only package dependency is the Universal Hardware Driver (UHD).

{{{
$ ./configure
$ make
$ sudo make install
}}}

Running

{{{
$ osmo-trx -h
linux; GNU C++ version 4.8.1 20130603 (Red Hat 4.8.1-1); Boost_105300; UHD_003.005.004-140-gfb32ed16

Options:
-h This text
-a UHD device args
-l Logging level (EMERG, ALERT, CRT, ERR, WARNING, NOTICE, INFO, DEBUG)
-i IP address of GSM core
-p Base port number
-d Enable dual channel diversity receiver
-x Enable external 10 MHz reference
-s Samples-per-symbol (1 or 4)
-c Number of ARFCN channels (default=1)
}}}

{{{
$ osmo-trx -a "addr=192.168.10.2"
linux; GNU C++ version 4.8.1 20130603 (Red Hat 4.8.1-1); Boost_105300; UHD_003.004.000-b14cde5

Config Settings
Log Level............... INFO
Device args............. addr=192.168.10.2
TRX Base Port........... 5700
TRX Address............. 127.0.0.1
Channels................ 1
Samples-per-Symbol...... 4
External Reference...... Disabled
Diversity............... Disabled

-- Opening a UmTRX device...
-- Current recv frame size: 1472 bytes
-- Current send frame size: 1472 bytes
-- Setting UmTRX 4 SPS
-- Transceiver active with 1 channel(s)
}}}

Authors

OsmoTRX is currently developed and maintained by Thomas Tsou. The original code is derived from the OpenBTS project, which was developed by David Burgess and Harvind Samra at Range Networks.

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