osmo-trx/Transceiver52M
Pau Espin 207911bcde usrp1: don't check for non-null underrun pointer
The pointer can't never be null, so avoid checking it.

Change-Id: I12e14641713a6494bc89570f02cecfc6f8fd4b5e
2019-07-29 20:42:56 +02:00
..
arch Add SPDX annotation 2019-07-22 12:06:26 +02:00
device usrp1: don't check for non-null underrun pointer 2019-07-29 20:42:56 +02:00
Channelizer.cpp Add SPDX annotation 2019-07-22 12:06:26 +02:00
Channelizer.h mcbts: Add multi-ARFCN channelizing filters 2016-07-01 03:07:27 -07:00
ChannelizerBase.cpp Add SPDX annotation 2019-07-22 12:06:26 +02:00
ChannelizerBase.h mcbts: Add multi-ARFCN channelizing filters 2016-07-01 03:07:27 -07:00
Complex.h Alexander's patches: 2012-11-23 08:37:32 +00:00
Makefile.am Transceiver: Move out TRXD socket send code to prepare for TRXDv1 2019-07-19 11:44:13 +00:00
README Adding in the missing Transceiver52M directory 2011-10-12 07:44:40 +00:00
README.DFEsymbolspaced Adding in the missing Transceiver52M directory 2011-10-12 07:44:40 +00:00
Resampler.cpp Add SPDX annotation 2019-07-22 12:06:26 +02:00
Resampler.h Add SPDX annotation 2019-07-22 12:06:26 +02:00
Synthesis.cpp Add SPDX annotation 2019-07-22 12:06:26 +02:00
Synthesis.h mcbts: Add multi-ARFCN channelizing filters 2016-07-01 03:07:27 -07:00
Transceiver.cpp Transceiver: Clean up code passing parameters to threads 2019-07-23 09:06:01 +00:00
Transceiver.h Transceiver: Clean up code passing parameters to threads 2019-07-23 09:06:01 +00:00
inband-signaling-usb Adding in the missing Transceiver52M directory 2011-10-12 07:44:40 +00:00
laurent.m Transceiver52M: Add 4 samples-per-symbol Laurent pulse shape 2013-10-18 13:10:17 -04:00
osmo-trx.cpp Bind CTRL port to IP addr specified in VTY config 2019-07-22 22:15:24 +00:00
proto_trxd.c trxd_fill_common(): fix TRXD header version coding 2019-07-20 19:39:18 +07:00
proto_trxd.h Transceiver: Support TRXD v1 2019-07-19 14:58:29 +02:00
pulseApproximate.m Adding in the missing Transceiver52M directory 2011-10-12 07:44:40 +00:00
radioBuffer.cpp Add SPDX annotation 2019-07-22 12:06:26 +02:00
radioBuffer.h radioBuffer: Remove extra ; at the end of inline function definitions. 2017-03-20 18:41:02 +00:00
radioClock.cpp Add SPDX annotation 2019-07-22 12:06:26 +02:00
radioClock.h Add SPDX annotation 2019-07-22 12:06:26 +02:00
radioInterface.cpp radioInterface: Clarify how underruns are handled driving a radioDevice 2019-07-29 20:42:56 +02:00
radioInterface.h radioInterface: forward errors from RadioDevice to Transceiver in recv path 2018-09-03 18:53:52 +02:00
radioInterfaceMulti.cpp Add SPDX annotation 2019-07-22 12:06:26 +02:00
radioInterfaceResamp.cpp Add SPDX annotation 2019-07-22 12:06:26 +02:00
radioVector.cpp Add SPDX annotation 2019-07-22 12:06:26 +02:00
radioVector.h Add SPDX annotation 2019-07-22 12:06:26 +02:00
sigProcLib.cpp Add SPDX annotation 2019-07-22 12:06:26 +02:00
sigProcLib.h sigProcLib: Add C/I (Carrier-to-Interference ratio) computation 2019-07-19 11:44:13 +00:00
signalVector.cpp SigProcLib: Improve Vector buffer allocation mess 2018-12-05 19:41:34 +00:00
signalVector.h SigProcLib: Improve Vector buffer allocation mess 2018-12-05 19:41:34 +00:00
std_inband.rbf Adding in the missing Transceiver52M directory 2011-10-12 07:44:40 +00:00

README

The Transceiver

The transceiver consists of three modules:
   --- transceiver
   --- radioInterface
   --- USRPDevice

The USRPDevice module is basically a driver that reads/writes
packets to a USRP with two RFX900 daughterboards, board 
A is the Tx chain and board B is the Rx chain.  

The radioInterface module is basically an interface b/w the
transceiver and the USRP.   It operates the basestation clock
based upon the sample count of received USRP samples.  Packets 
from the USRP are queued and segmented into GSM bursts that are
passed up to the transceiver; bursts from the transceiver are
passed down to the USRP. 

The transceiver basically operates "layer 0" of the GSM stack,
performing the modulation, detection, and demodulation of GSM 
bursts.  It communicates with the GSM stack via three UDP sockets,
one socket for data, one for control messages, and one socket to
pass clocking information.  The transceiver contains a priority
queue to sort to-be-transmitted bursts, and a filler table to fill
in timeslots that do not have bursts in the priority queue.  The
transceiver tries to stay ahead of the basestation clock, adapting 
its latency when underruns are reported by the radioInterface/USRP.
Received bursts (from the radioInterface) pass through a simple 
energy detector, a RACH or midamble correlator, and a DFE-based demodulator.

NOTE: There's a SWLOOPBACK #define statement, where the USRP is replaced
with a memory buffer.  In this mode, data written to the USRP is actually stored 
in a buffer, and read commands to the USRP simply pull data from this buffer.
This was very useful in early testing, and still may be useful in testing basic
Transceiver and radioInterface functionality.