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2016-07-01transceiver: Add Rx samples-per-symbol optionTom Tsou2-21/+21
Previous approach was to enable 4 SPS on the receive path only for EDGE use, which is not a requirement for 4 SPS operation. Make the 4 SPS configuration setting directly settable. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-06-28transceiver: Do not report error on SETTSC when radio is onTom Tsou1-1/+1
OsmoTRX does not support the use of multiple TSC settings per internal TRX instance. There should not be an error to modifiy the TSC value after POWERON. Setting TSC value on TRX channels other then 0 is a NOP operation that should only error if the requested TSC differs from that of TRX channel 0. Reported-by: Max <msuraev@sysmocom.de> Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-06-22transceiver: Add an option to emulate a RACH delay in random filler mode.Alexander Chemeris5-17/+32
Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-06-22transceiver: Log channel number in DEBUG output of demoded bursts.Alexander Chemeris2-3/+4
Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-06-22radioInterface: Initialize power scale with a meaningful default.Alexander Chemeris1-0/+2
Right now if you forget to send "POWER" control command, osmo-trx will transmitt zeros. This is counter-intuitive and I've spent several hours debugging this "issue". The issue may happen easily, because osmo-bts doesn't send "POWER" command if there is no "power" setting in the configuration file. Given that "POWER" command actually sets attenuation, it's percieved as optional and in absence of it should default to "POWER 0" (no attenuation), which translates to power scale being 1.0. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-06-22uhd: Fix comment.Alexander Chemeris1-1/+1
It's osmo-trx, not OpenBTS anymore. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-06-22radioDevice: GSMRATE macro must have parentheses around its definition.Alexander Chemeris1-1/+1
So we had the following define: #define GSMRATE 1625e3/6 Now, I wanted to use it in the following expression: 3.0/GSMRATE which turns into: 3.0/1625e3/6 while what I really wanted is: 3.0/(1625e3/6) = 3.0/1625e3*6 To avoid this, all macros with calculations must be enclosed in parentheses. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-06-22makefile: Fix build from an external path.Alexander Chemeris2-2/+2
When you build from an external path, compiler can't find convert.h include, because it was specified relative to the current directory. Change this to specify the include dit relative to the Makefile location. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-06-21sigproc: Expand RACH, TSC, and EDGE correlation windowsTom Tsou1-10/+10
Slightly widen the search range to accommodate timing jitter on certain classes of devices. The expanded range minimizes the possibility of missing bursts that arrive too early or too late due to timing error. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-05-03uhd: Set minimum UHD version requirement for E3XXTom Tsou1-3/+31
Create runtime version check for minimum supported UHD driver when using USRP E3XX devices. The minimum version, 3.9.0, matches supported version on current E3XX release images. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-05-03uhd: Make device offset check a private methodTom Tsou1-61/+62
Removes extra arguments and a static call. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-05-03uhd: Set default Tx sampling to 4 spsTom Tsou1-6/+1
The majority of GSM host platforms are capable of operating with the 4x oversampled modulator, which justifies the new default setting. The small number exceptions (e.g. Raspberry Pi) can still use the lower complexity 1 sps modulator with the '-s 1' command line option if required. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-05-03uhd: Update default E3XX settingsTom Tsou1-4/+5
Tune timing values after testing on UHD 003.009.002 for E3XX. Table value for 1 sps was off by 10 samples causing improper operation. Table value for 4 sps was shifted by 1 sample for more accurate timing. Also update E3XX description string detection. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-05-02common: Add mandatory length field to UDP receive callsTom Tsou1-2/+2
Current UDP receive reads up to MAX_UDP_LENGTH bytes into the passed in buffer, which may lead to buffer overflow if the write buffer is of insufficient size. Add mandatory length argument to UDP socket receive calls. Reported-by: Simone Margaritelli <simone@zimperium.com> Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-04-26EDGE: Fix demodulation slicer inputTom Tsou1-1/+1
EDGE 8-PSK soft slicer was receiving input from the output of the downsampler. Equalization and derotation were missing causing the soft symbol output to be invalid. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-04-26uhd: Correct timing alignment in 8-PSK and GMSK downlink burstsTom Tsou2-7/+16
Delay the EDGE downlink bursts by one symbol in order to match GMSK pulse shaping group delay. The difference in group delay arises from the dual pulse filter combination of the GMSK Laurent represenation whereas 8-PSK uses a single pulse linear filter. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-04-26transceiver: Do not pass transceiver state struct to function where it's not ↵Alexander Chemeris2-8/+7
used.
2016-04-26osmo-trx: Output Rx SPS as a part of configuration output.Alexander Chemeris1-0/+1
2016-04-20transceiver: Add an option to generate random Access Bursts.Alexander Chemeris5-1/+48
2016-04-20transceiver: Properly handle MAXDLY.Alexander Chemeris4-11/+24
Previously MAXDLY value was applied to Normal Bursts, which was nice when working with sloppy test equipment like CMD57, but useless for real world usage. At the same time documentation and de facto usage of MAXDLY in OsmoBTS and OpenBTS assumed that it actually applies to Access Bursts (RACH). So this patch changes osmo-rx behavior to apply MAXDLY to RACH bursts and introduces a new command MAXDLYNB for the old behavior.
2016-03-23EDGE: Fix USRP B210 device supportTom Tsou1-0/+1
Commit 871b8782 "EDGE: Add support for UmTRX" disabled B210 support using EDGE. Add B210 explicitly to the timing offset table to avoid this issue. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-03-22EDGE: Add support for UmTRX.Alexander Chemeris1-24/+14
Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-03-08EDGE: Combine shared GMSK and 8-PSK demodulator sectionsTom Tsou1-22/+35
Timing recovery and single tap channel compensation are identical in both GMSK and EDGE receivers. This is the section ahead of and including the optional 4-1 downsampler. GMSK and EDGE specific sections operate at 1 SPS. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-03-08EDGE: Add random burst generator filler optionTom Tsou3-6/+18
When EDGE is enabled with the '-e' option, the random burst generator switches from GMSK normal bursts to 8-PSK EDGE bursts. $ ./osmo-trx -e -r 7 Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-03-08sigproc: Add various GSM burst generatorsTom Tsou3-41/+74
Setup generators for empty, random, and dummy bursts. This moves error prone burst length handling out of the Transceiver and into the signal processing core. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-03-08sigproc: Always use 625 sample length bursts with 4 SPSTom Tsou1-12/+12
At 4 samples per symbol, we don't need to maintain the 156/157 sample slot structure to account for the GSM 156.25 sample burst length. Set the 4 SPS Laurent modulator to ignore the guard interval setting and always output 625 sample sized bursts. The EDGE 8-PSK modulator already has this behavior. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-03-08EDGE: Add interfaces to enable EDGE transceiverTom Tsou4-39/+99
Create EDGE slot type in the Transceiver. When EDGE mode is enabled for a particular slot, blind detection will be performed by correlating against EDGE followed by normal bursts if no EDGE burst is found. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-03-06EDGE: Add 8-PSK modulator and demodulatorTom Tsou4-32/+537
Setup correlator and detection process similar to the GMSK receiver chain. Require 4 SPS sampling on both Rx and Tx paths as 1 SPS sampling adds too much distoration for 8-PSK recovery. Core receiver operations still run at 1 SPS with the exception of fractional delay filtering, which runs at the higher rate. Perform linear equalization to handle the Gaussian pulse induced ISI. The fixed impulse response used for equalizer tap calculation consists of combined EDGE pulse shape filter and effects of the downsampling filter. Note that the non-adaptive equalizer corrects for modulation induced band limiting and does not account for or compensate for fading channel effects. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-03-06EDGE: Setup variable sampling on receive pathTom Tsou9-74/+144
Allow setting the device to non single SPS sample rates - mainly running at 4 SPS as the signal processing library does not support other rates. Wider bandwith support is required on the receive path to avoid 8-PSK bandlimiting distortion for EDGE. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-03-06sigproc: Remove normal burst DFE equalizerTom Tsou4-301/+29
DFE equalizer is unused and has been experiencing code rot for multiple years. The effect is a significant amount of baggage being carried in the Transceiver and interfaces. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-03-06sigproc: Remove dynamic SPS configurationTom Tsou3-67/+52
Samples per symbol used by the transceiver is not configurable through the socket interface once running, so stop pretending like it could be. Initialize all tables and midambles at start. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2015-11-09Transceiver52M: Fix ARM build issuesTom Tsou1-11/+11
Patch f147b174 "sigproc: Make convolution and convert input buffers immutable" changed the internal conversion interface with the addition of the const type qualifier. This change was not reflected on ARM builds which led to build failure. Add const qualifier to resolve build issue. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2015-10-21uhd: Remove references to USRP B205Tom Tsou1-11/+2
Certain pre-release versions of the B200mini used the B205 naming, which no longer exists. Update device naming and detection to reflect current UHD product names. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2015-08-21sigproc: Make convolution and convert input buffers immutableTom Tsou5-55/+68
For good practice, use const specifier when applicable. Signed-off-by: Tom Tsou <tom@tsou.cc>
2015-08-21uhd: Use internal UHD tick conversionsTom Tsou1-26/+10
UHD handles built in tick and floating point timestamp conversion since version 003.005.004. This removes the need for separate UHD timespec to tick conversion. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2015-08-21uhd: Add version 3.9.0 supportTom Tsou1-6/+26
New functionality includes B200-mini device support and updated timing values to match FPGA changes. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2015-07-30uhd: Output Rx/Tx gain limits to log to make it more transparent.Alexander Chemeris1-4/+10
Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2015-07-30Transceiver: Add support for OsmoBTS style handover.Alexander Chemeris2-4/+47
Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2015-07-30Transceiver: Fix whitespace.Alexander Chemeris1-2/+2
Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2015-07-30uhd: Fix UmTRX tuning broken in commit 90f7a01d.Alexander Chemeris1-1/+2
Commit 90f7a01d lost "return" statement. We also should account the fact that offset can be negative. We should return the tuning request immediately after Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2015-07-30transceiver: Add a debug option to dump selected timeslots to disk.Alexander Chemeris2-1/+27
Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2015-07-30Transceiver: Do not update state->SNRestimate if equalization is disabled.Alexander Chemeris1-4/+4
This also fix a bug of using bool type for noise instead of float. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2015-07-30uhd: Fix rounding error in timestamp conversion functions.Alexander Chemeris1-2/+14
Rounding error introduced oscilating timing advance error by regularly overwriting one bit and then skipping one bit. This commit also adds an error message to show up in logs if this ever happens again. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2015-07-30sigProcLib: Abstract out common part of Normal/RACH burst detection.Alexander Chemeris3-82/+65
As a side change - get rid of passing toa and amp arguments as pointers and use references instead. The commit doesn't change behaviour, but makes the code cleaner. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2015-07-30Transceiver: Update noise level only when the timeslot is marked as IDLE.Alexander Chemeris2-16/+32
We can't rely on an assumption that if we can't decode a burst - it's noise. There are many rasons why we can't decode a burst even if it's well above the noise level. Just one example is a RACH burst which can be overlapped with another RACH burst up to a level both are completely unrecognizable. Another example is when a burst is destroyed by bad multi-path. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2015-07-30transceiver: Remove noise/RSSI gating.Alexander Chemeris1-2/+1
It does more harm than good. the current noise calculation is too error prone, so we can't trust it. And we end up loosing perfectly good bursts because of that. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2015-07-30osmo-trx: Add an option to swap channels on UmTRX.Alexander Chemeris5-9/+16
Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2015-07-30sigProcLib: Check for bogus TOA before using it.Alexander Chemeris1-2/+2
Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2015-07-30Transceiver: Fix clipping detection.Alexander Chemeris3-36/+55
There are two primary changes in this commit: 1) Return values of detect functions changed form bool to int to actually pass the return value from the inner function and notify higher levels about clipping. Previously the information was lost due to conversion to bool. 2) Clipping level is not the final verdict now. We still try to demod a burst and mark it as clipped only if the level is above the clipping level AND we can't demod it. The reasoning for this is that in real life we want to do as much as possible to demod the burst, because we want to get as much from our dynamic range as possible. So a little bit of clipping is fine and is expected. We just don't want too much of it to break our demod. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2015-07-30Transceiver: Print noise level for each burst in debug mode.Alexander Chemeris2-10/+14
Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
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