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During BTS operation, active downlink bursts drive the clock indication,
but the flow of bursts is not present in MS mode. Shift the indication
trigger to the lower non-blocking loop with FN mod 100 as the interval.
Signed-off-by: Tom Tsou <tom@tsou.cc>
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Use a 64-bit hex value as the mask specifier because the integer string
is rather unwieldly. Fix 64-bit register handling on the mask check.
Receive burst masking is only available on in MS tracking mode (post SCH
acquisition).
Modulus values greater than 64 remain unsupported.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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The +/- 3 frame offset for Tx/Rx is setup in the RadioInterface
constructor, so we need to know whether we are operating in MS or BTS
mode at the very beginning.
For MS mode, handle negative frame offsets, which would previously cause
an assertion error.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Extend the measured SCH timing offset from the downlink to the uplink
path. In order to absorb the frame timing adjustment and remove the
potential of thread contention during the change, combine the lower
FIFO threads into single drive loop.
Force timing changes through to the UHD interface with stream flags
triggered through the updateAlignment() call.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Create 64-bit multiframe masks for each physical slot. These are set
through the SETRXMASK command with first and second arguemnts timeslot
and mask respectively.
Modulus value of 102 is currently not handled and will cause all receive
bursts on that slot to be disabled in MS tracking mode.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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The GETBSIC command returns 1 if no SCH has been decoded, and 0 with
the BSIC value if SCH decoding has been successful.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Setup two SCH detection ranges - full search and narrow search. Full
search correlates the full burst length to find for SCH detection.
Narrow uses a reduced search range, which is the same as that used for
RACH detection.
Narrow searching is enabled after the SCH is successfully decoded and
the MS is locked to the frame timing.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Enable frequency detection and correction by buffering the previous
frame to allow FCCH measurement and compensation after frame timing is
locked using the SCH. When the SCH is detected and symbol timing
matched, measure the FCCH burst from one frame prior and compensate by
baseband tuning the DDC on the device. Avoid appying frequency
corrections to the RF portion due to possible tuning delays, which is
not an issue with DDC tuning.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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When in MS acquisition mode, attempt to decode SCH and establish the BTS
frame timing. Lock the transceiver GSM clock to the BTS by adjusting the
clock value by the measured burst-SCH offset.
Add tracking state, TRX_MODE_MS_TRACKING, which continues to detect and
decode the SCH with timing tracking, but only on SCH poitions within the
51 multiframe.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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On receipt of a SYNC command on the socket interface, set the mode to
TRX_MODE_MS_ACQUIRE, which attempts to synchronize against a remote BTS
signal by detecting the SCH burst and timing offset. The transceiver
defaults to TRX_MODE_OFF, which implies no BTS or MS capability has been
enabled.
There is currently no command to enable the BTS mode. The MS mode also
disables uplink transmission since no such capability is implemented.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Use similar approach for detecting normal and RACH bursts, but apply a
sample shift after detection in order to gradually zero the measured
timing offset. SCH synchronization sequence and setup are added similar
to RACH detection with the main difference, aside being the SCH runs
full length of the burst. History is also added to accommodate full
length burst correlation.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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An errant shuffle register value used in complex-complex convolution
causes distorted correlation peak-to-average values for certain TSC
values. The error effect varies for different TSC sequences with the
most noticeable effect of degraded detection on TSC 1 and no effect on
TSC 7.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Commit 15d743efaf8d3ec8dacd37fbac434c1e719c0b30 "Disable filler table
retransmissions by default" made OpenBTS style filler table behavior
optional. When enabled, dummy bursts were automatically loaded into the
filler table, but the table was not updated and only filler busts were
retransmitted.
Enable the restransmit state flag when the filler table option is
specified. Only preload filler table and enable retransmissions on
channel zero.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Device specific timing settings for the E100 and E110 were missing from
the Tx/Rx offset table. Add E1XX identifier and offsets to the device
list and offset table respectively.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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UHD requires a small amount of time to align multiple streams at
startup. Delay the startup by 100 ms relative to the queried device time
(actual delay inclusive of control latencies will be less).
The following error is only relevant to dual-channel UHD devices (e.g.
Fairwaves UmTRX and Ettus B210).
UHD Error:
The receive packet handler failed to time-align packets.
1002 received packets were processed by the handler.
However, a timestamp match could not be determined.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Recent versions of UHD require setting the sample rate before creating
streamers otherwise the following exception occurs.
Boost_105300; UHD_003.007.000-0-g7fef199d
terminate called after throwing an instance of
'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::math::rounding_error> >'
what(): Error in function boost::math::round<d>(d): Value -nan can not be represented in the target integer type.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Allow command line setting of the DSP frequency in UHD. All channels
will be tuned with the same offset. Dual-channel tuning with the B210,
which uses a single LO, will override the command line offset value
and set the DSP frequency automatically.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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The main difference between existing UmTRX dual channel is the
single LO on B210 transmit and receive front-ends vs. independent
tuning paths. In order to support dual-ARFCN frequencies, baseband
offset conversion must be applied by tuning the FPGA CORDIC for
each channel. For B210, the following tuning order is applied.
1. If the new frequency of channel A is within the baseband range
of channel B, then retune both channels with the RF centered
and equal valued positive and negative baseband shifts.
2. If the new frequency of channel A is not with the baseband range
of channel B, then retune channel A directly (without manual
applied offset). Channel B will no longer be tuned to the
previous frequency.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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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>
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Differentiate between the two in order to provide enumeration
for dual-channel support.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Change from the original USRP1 rate of 52 MHz. On B2XX we can use
26 MHz, which is closer to the default 32 MHz of the device.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Burst selection at a particular time works in the following order
of priority.
1. Slot is disabled with channel combination set to NONE (default)
1. Burst exists in priority queue for the current time.
2. Filler table entry is used
This patch sets default behaviour to force all filler table entries
to zero and disallows filler table changes. This effectively means
that only bursts received from upper layers will be transmitted and
nothing will be automatically transmitted in the absence or delay
of incoming burts at a particular time.
New Command line option "Enable C0 filler table" allows reverting
to previous idle burst generation and retransmission behaviour on
TRX0. Retransmission cannot be enabled on non-C0 channels.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Downlink scaling factors, which are stored in a vector for multiple
channels, was not being sized correctly.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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We don't require any parameters stored in the configuration table,
so don't bother with the existence of the persistent database file.
This also removes an unnecessary step during initial setup since
relevant parameters can be configured from the command line.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Equalization is currently disabled by default. As such, we don't need to
run channel estimates or even track the update state, which would
otherwise be allocating/decallocating the channel state vector at
regular intervals.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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On startup errors we get a segfault if we stop and shutdown. This
is because we try to send a stop stream command to the device before
it has been created. Setup a check for running status before
attempting to stop the physical device.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Create new main executable with full command line option parsing
of relevant parameters. Database configuration table still exists
(and must exist because of the global gConfig object), but can
be bypassed with command line options.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Very useful user information at startup.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Mainly basic signed vs unsigned comparisons and intializer ordering.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Empty destructor removes compile warning.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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This includes unknown and unused variables, functions, and
non-relevant documentation.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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We support one TSC value per each transceiver object. Only channel
zero can set this value. Other channels can attempt to set the TSC
value, but will error if the TSC does not match the existing value.
In either case, non-zero channels do not manipulate the gloabl TSC
setting.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Simply vectorize the existing power state variable.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Pointer accessor and noise average methods for radio and noise vectors
respectively.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Each ARFCN channel may be independently configureted and possibly on
separate hardware, so don't share a single vector for noise estimate
calculations. Allow a non-pointer based iterator so we can get away
with using the default copy constructor.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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The transceiver has the ability to detect bursts below the noise floor,
but little hope in successful decoding, so don't even try. We still use
the detected burst to differentiate against noise vs actual data.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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In errant cases, GSM core may send bursts with invalid slot values,
which is allowed by the GSM::Time object. If we find a burst like this
coming into the transceiver, then drop it immediately.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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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>
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Separate the large pullRadioVector() call, which forms the central
portion of the receive path burst processing. Break out RACH, normal
burst, and demodulation into separate methods. This makes the burst
handling from the FIFO read to soft bit output somewhat more
manageable.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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The call into table lookup will loop on values outside of the
table range. With continuously increasing phase, this leads
to an eventual permanent hard spin. Wrap the phase value to
prevent that from happening.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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As we add more channel combintions including but not limited to
new devices, signal processing schemes, and diversity, we'll
need to handle more special cases. Add string descriptions for
just a bit more sanity.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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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>
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Style change for clarity only.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Stack allocating the correlation output generates a call to the copy
constructor of an zero valued vector. We can avoid this extra copy
constructor with a pointer reference and dynamic allocation.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Allow non-in-place use of the delay setting. Internally, the delay call
creates a new vector and copies the contents back into the original.
Instead, provide the option to return the computed output vector
directly and remove an an extra copy in the process.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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On Beagle Board the call into the sinc() function is generating a lot of
load on the peak interpolation. Simplify the sinc() function with a
dedicated table lookup. Eventually, this table may be removed in favour
of using a precomputed filterbank for fractional delay determination.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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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>
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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>
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Clock indications passed up to GSM core originate on the transciever
downlink side. Set priority to keep the flow of clock updates
consistent.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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This includes ARM Cortex A8 and A15 powered device such as Beagle
Board, Gumstix driven E100 USRP, and Arndale board. Set the reduced
SPS value automatically for the user.
For x86, if we don't support SSE3, then the architecture is
probably ancient and not with using. Drop the sampling down anyways
to at least make an attempt. Non floating point SIMD devices (e.g.
Raspberry Pi) also fall in this category
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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