path: root/Transceiver52M/radioInterface.cpp
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2017-05-19radioInterface: Remove UmTRX 'diversity' optionTom Tsou1-8/+5
The 'diversity' option was an experimental 2 antenna receiver implementation for UmTRX. The implementation has not been maintained and current working status is unknown. In addition to code rot, Coverity is triggering errors in the associated code sections. Removal of code cleans up many cases of special handling that were necessary to accommodate the implementation. Change-Id: I46752ccf5dbcffbec806081dec03e69a0fbdcdb7
2016-07-12radioInterface: Fix multi-channel buffer index bugTom Tsou1-1/+1
Discrete RF multi-channel was using hard coded buffer index on the channel iteration for transmit sample conversion. End result was segmentation fault on dual RF channel devices with both channels active (Ettus B210 and UmTRX). Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2016-07-01iface: Add inner ring-buffer implementationTom Tsou1-127/+75
Two buffers, inner and outer, are used in the transceiver implementation. The outer buffer interfaces with the device receive interface to guarantee timestamp aligned and contiguously allocated sample buffers. The inner buffer absorbs vector size differences between GSM bursts (156 or 157 samples) and the resampler interface (typically fixed multiples of 65). Reimplement the inner buffer with a ring buffer that allows fixed size segments on the outer (resampler) portion and variable lengths (GSM side) on the inner side. Compared to the previous stack-like version, this implementation removes unnecessary copying of buffer contents. 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>
2016-03-06EDGE: Setup variable sampling on receive pathTom Tsou1-7/+13
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>
2015-05-07radioInterface: Reset sample buffer cursors on each startTom Tsou1-0/+3
Non-zero buffer indices may lead to uplink/downlink timing offset during repeated start/stop cycles. Mainly affects USRP2 and other resampled devices that rely on the buffer to absorb sample block sizes that are not multiples of the burst size. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
2014-12-15Transceiver52M: Implement POWEROFF commandTom Tsou1-4/+26
Add stop and restart capability through the POWEROFF and POWERON commands. Calling stop causes receive streaming to cease, and I/O threads to shutdown leaving only the control handling thread running. Upon receiving a POWERON command, I/O threads and device streaming are restarted. Proper shutdown of the transceiver is now initiated by the destructor, which calls the stop command internally to wind down and deallocate threads. Signed-off-by: Tom Tsou <tom@tsou.cc>
2014-12-15Transceiver52M: Allow setting gain before POWERONTom Tsou1-5/+9
There is no reason gain settings should not be modifiable when the radio is running or not. Signed-off-by: Tom Tsou <tom@tsou.cc>
2014-03-03Transceiver52M: Disable initial device time resetThomas Tsou1-5/+5
With dual-channels on B210, we lose the ability to reset both channels to a synchronized state. Instead, let the timestamp clock start with an arbitary value, which is the first timestamp received from the device, instead of a near-zero value. This approach also makes integration for device, in general, with free-running timestamp clocks. Signed-off-by: Thomas Tsou <tom@tsou.cc>
2013-11-15Transceiver52M: Enable all warnings and resolveThomas Tsou1-1/+1
Mainly basic signed vs unsigned comparisons and intializer ordering. Signed-off-by: Thomas Tsou <tom@tsou.cc>
2013-11-15Transceiver52M: Remove unused codeThomas Tsou1-1/+1
This includes unknown and unused variables, functions, and non-relevant documentation. Signed-off-by: Thomas Tsou <tom@tsou.cc>
2013-11-15Transceiver52M: Use independent power scaling varables for each channelThomas Tsou1-6/+5
Simply vectorize the existing power state variable. Signed-off-by: Thomas Tsou <tom@tsou.cc>
2013-11-15Transceiver52M: Add dual channel diversity receiver optionThomas Tsou1-12/+12
This patch add support for dual channel diversity on the receive path. This allows two antennas two shared antennas to be used for each ARFCN handling channel in the receiver. This configuration may improvde performance in multi-path fading environments, however, noise andpotential interference levels are increased due to the higher bandwidth used. The receive path is oversampled by a factor of four for a rate of 1.083333 Msps. If the receive paths are tuned within a maximum channel spacing (currently set at 600 kHz), then both ARFCN frequencies are processed by each channel of the receiver. Otherwise, the frequency shifted diversity path is disabled and standard non-diversity operation takes place. Diversity processing is handled by selecting the path with the higheset energy level and discarding the burst on the second path. Selection occurs on a burst-by-burst basis. Signed-off-by: Thomas Tsou <tom@tsou.cc>
2013-11-15Transceiver52M: Add vectorized radio burst capabilityThomas Tsou1-2/+4
This patch allows multiple signalVectors to be stored within a single radioVector object. The motivation is to provide a facility for diversity and/or MIMO burst handling. When no channel value is specified, single channel bevhaviour is maintained. Signed-off-by: Thomas Tsou <tom@tsou.cc>
2013-11-15Transceiver52M: Preallocate head room for burst correlationThomas Tsou1-4/+11
Set a transceiver high level length value that specifies the largest number of complex or real filter taps that we will encounter. This allows preallocation of head room and prevents an extra allocation and copy on every incoming receive burst. Signed-off-by: Thomas Tsou <tom@tsou.cc>
2013-11-15Transceiver52M: UHD: Continue on receive and send timeoutsThomas Tsou1-4/+0
With testing on current UHD releases, currently 003.005.xxx series, timeout errors on both receive and transmit are recoverable on network and USB based devices. Remove the fatal error conditions. Signed-off-by: Thomas Tsou <tom@tsou.cc>
2013-11-15Transceiver52M: Remove extra copy in receive drive pathThomas Tsou1-14/+11
Currently the code allocations a signalVector and then copies into a radioVector. This is unnecessary because the latter is a derived class making the first allocation unnecessary. Modify the radioVector constructor to allow direct use in the case above. Signed-off-by: Thomas Tsou <tom@tsou.cc>
2013-11-15Transceiver52M: Add multi channel transceiver supportThomas Tsou1-62/+104
This patch primarily addresses devices with multiple RF front end support. Currently device support is limited to UmTRX. Vectorize transceiver variables to allow multiple asynchronous threads on the upper layer with single downlink and uplink threads driving the UHD I/O interface synchronously. Signed-off-by: Thomas Tsou <tom@tsou.cc>
2013-10-18Transceiver52M: Reduce and place bounds checking on I/O buffersThomas Tsou1-11/+17
Previous send and receive buffers at the radio interface were arbitrarily set to a sufficient size. For normal (non-resampling) devices, use a block (chunk) size of 625 samples. For 64 or 100 MHz resampling devices, use 4 times the reduced resampling numerator or denominator and provide bounds checking where appropriate. Signed-off-by: Thomas Tsou <tom@tsou.cc>
2013-10-18Transceiver52M: Add 64 MHz resampling option with B100Thomas Tsou1-1/+4
Move B100 to the resampling interface with default clocking. This temporarily resolves undetermined FPGA clocking issues. This also provides extensible support for multiple clocking rates and resampling ratios. Signed-off-by: Thomas Tsou <tom@tsou.cc>
2013-10-18Transceiver52M: Setup dual sample rate transceiverThomas Tsou1-15/+19
This patch applies oversampling, when selected with 4 sps, to the downlink only, while running the receiver with minimal sampling at 1 sps. These split sample rates allow us to run a highly accurate downlink signal with minimal distortion, while keeping receive path channel filtering on the FPGA. Without this patch, we oversample the receive path and require a steep receive filter to get similar adjacent channel suppression as the FPGA halfband / CIC filter combination, which comes with a high computational cost. Signed-off-by: Thomas Tsou <tom@tsou.cc>
2013-10-18Transceiver52M: Add SSE floating point / integer conversionThomas Tsou1-52/+43
Convertions are performed in multiples of 4 or 8. All loads are considered unaligned. Signed-off-by: Thomas Tsou <tom@tsou.cc>
2013-10-18Transceiver52M: Replace resampler with SSE enabled implementationThomas Tsou1-21/+51
Replace the polyphase filter and resampler with a separate implementation using SSE enabled convolution. The USRP2 (including derived devices N200, N210) are the only supported devices that require sample rate conversion, so set the default resampling parameters for the 100 MHz FPGA clock. This changes the previous resampling ratios. 270.833 kHz -> 400 kHz (65 / 96) 270.833 kHz -> 390.625 kHz (52 / 75) The new resampling factor uses a USRP resampling factor of 256 instead of 250. On the device, this allows two halfband filters to be used rather than one. The end result is reduced distortial and aliasing effecits from CIC filter rolloff. B100 and USRP1 will no be supported at 400 ksps with these changes. Signed-off-by: Thomas Tsou <tom@tsou.cc>
2013-10-18Transceiver52M: Rename samples-per-symbol variable namesThomas Tsou1-7/+7
Because repeatedly typing mSamplesPerSymbol is giving me carpal tunnel syndrome. Replace with the much shorter, easier to type, and just as clear name of 'sps'. Signed-off-by: Thomas Tsou <tom@tsou.cc>
2013-10-18Transceiver52M: Set resampling option automatically based on deviceThomas Tsou1-0/+60
Remove the built time resampling selection and link both options. Move the normal push/pullBuffer() calls back to the base class and overload them in the inherited resampling class. USRP2/N2xx devices are the only devices that require resampling so return that resampling is necessary on the device open(), which is the point at which the device type will be known. The GSM transceiver only operates at a whole number multiple of the GSM rate and doesn't care about the actual device rate and if resampling is used. Therefore GSM specific portion of the transceiver should only need to submit the samples-per-symbol value to the device interface. Then, the device should be able to determine the appropriate sample rate (400 ksps or 270.833 ksps) and if resampling is appropriate. Signed-off-by: Thomas Tsou <tom@tsou.cc>
2013-10-18Transceiver52M: Remove and rename oversampling variablesThomas Tsou1-3/+2
The transceiver only uses a single integer oversampling value, which is more simply referred to as samples-per-symbol. mRadioOversampling --> mSPS mTransceiverOversampling (removed) Signed-off-by: Thomas Tsou <tom@tsou.cc>
2013-10-18Transceiver52M: Remove periodic alignment update from UHD buildThomas Tsou1-8/+4
Periodic timing alignment should never be required for UHD devices, though the mechanism was used as a fallback mechanism should UHD not properly recover after an underrun - as may occur in old 003.003.000 based revisions. This issue is not a concern in more recent UHD releases and deprecates this code for legacy USRP1 use only. Signed-off-by: Thomas Tsou <tom@tsou.cc>
2011-11-26transceiver: clean variable init of radio interface constructorkurtis.heimerl1-13/+6
Signed-off-by: Thomas Tsou <ttsou@vt.edu> git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2675 19bc5d8c-e614-43d4-8b26-e1612bc8e597
2011-11-26transceiver: move various radio interface definitionskurtis.heimerl1-2/+33
Move them out of the interface file - primarily for readability. Signed-off-by: Thomas Tsou <ttsou@vt.edu> git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2674 19bc5d8c-e614-43d4-8b26-e1612bc8e597
2011-11-26transceiver: separate I/O portion of radio interface implementationkurtis.heimerl1-85/+33
Move push and pull of buffers into a dedicated file. This will allow us to swap out resampling, non-resampling, and possibly floating point device interfaces while presenting a single floating point abstration in the interface itself. Signed-off-by: Thomas Tsou <ttsou@vt.edu> git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2670 19bc5d8c-e614-43d4-8b26-e1612bc8e597
2011-11-26transceiver: separate radio clock and vector interfaceskurtis.heimerl1-44/+0
Remove radio clock and vector interfaces into their own files. This clears up and simplifies the radio interface and, additionaly, prepares for a further split of the I/O portion for optional resampler use. Signed-off-by: Thomas Tsou <ttsou@vt.edu> git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2669 19bc5d8c-e614-43d4-8b26-e1612bc8e597
2011-11-26transceiver: remove extraneous commentskurtis.heimerl1-2/+3
These lines are virtually never enabled. Signed-off-by: Thomas Tsou <ttsou@vt.edu> git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2666 19bc5d8c-e614-43d4-8b26-e1612bc8e597
2011-11-26transceiver: fix bug in setting low-level attenuationkurtis.heimerl1-3/+3
This patch fixes some confusion in gain vs. attenuation setting. The UHD device is controlled through gain settings but OpenBTS represents gain in terms of attenuation relative to maximum - 0 dB attenuation. Signed-off-by: Thomas Tsou <ttsou@vt.edu> git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2662 19bc5d8c-e614-43d4-8b26-e1612bc8e597
2011-11-26transceiver: reinsert digital gain scalingkurtis.heimerl1-5/+22
Commit e161523c (transceiver: simplify transmit power control) changed transmit gain control to RF setting only. This was appropriate for a WBX board with 25 dB of gain control, but inappropriate for an RFX with fixed transmit gain. RFX boards will regain the ability to set transmit attenuation. Since gain is set on the RF side first, reintroducing digital gain settings should have limited overall effect on non-RFX daughterboards. Signed-off-by: Thomas Tsou <ttsou@vt.edu> git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2660 19bc5d8c-e614-43d4-8b26-e1612bc8e597
2011-11-26transceiver: simplify transmit power controlkurtis.heimerl1-20/+3
UHD will internally accept floats with a range of +/-1.0, which corresponds to a 16-bit signed integer range of apporximately +/- 32000. Set the default amplitude to .3, which is a safe value agaist saturation elsewhere in the transmit chain. The non-UHD maximum amplitude is unchanged at 13500. Remove digital gain control because it's unnecessary and causes extra load on enbedded systems. Signed-off-by: Thomas Tsou <ttsou@vt.edu> git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2654 19bc5d8c-e614-43d4-8b26-e1612bc8e597
2011-11-26transceiver: rework digital gain settingskurtis.heimerl1-4/+3
The output of the modulator or resampler is scaled and converted from floating point to fixed point. The scaling factor is the leftover dB in RF attention (relative to max transmit power), which is handled prior to the integer conversion. This should work across all daughterboards and non-UHD installations. Signed-off-by: Thomas Tsou <ttsou@vt.edu> git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2650 19bc5d8c-e614-43d4-8b26-e1612bc8e597
2011-11-26uhd: set attenuation relative to max RF gainkurtis.heimerl1-4/+3
Previously this was referenced off the the ad9862 PGA with a range from 0 to -20 dB. Instead base the attenuation factor on the maximum total RF gain returned by the device. Signed-off-by: Thomas Tsou <ttsou@vt.edu> git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2649 19bc5d8c-e614-43d4-8b26-e1612bc8e597
2011-11-26transceiver: fix initialization segfault in radio interfacekurtis.heimerl1-0/+1
'loadTest' variable was never initialized sometimes causing segmentation fault on transceiver startup. Signed-off-by: Thomas Tsou <ttsou@vt.edu> git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2631 19bc5d8c-e614-43d4-8b26-e1612bc8e597
2011-10-12Adding in the missing Transceiver52M directorydburgess1-0/+315
git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2307 19bc5d8c-e614-43d4-8b26-e1612bc8e597