Jared Boone
060da5d227
Add ChannelDecimator decimate by 2 and no-shift options.
2015-11-19 12:24:20 -08:00
Jared Boone
ccd64f3cd9
Add function for c8->c16 decimate by two without fs/4 shift.
2015-11-19 12:20:20 -08:00
Jared Boone
8967f0eaa1
Move common matchers to PacketBuilder.
2015-11-16 10:33:50 -08:00
Jared Boone
1770dff522
Finish object-izing Baseband and RSSI threads.
2015-11-11 10:54:36 -08:00
Jared Boone
d9106b6f44
Start object-ization of RSSI thread.
2015-11-11 10:11:37 -08:00
Jared Boone
19c89def75
Start to object-ize the baseband thread function.
2015-11-11 10:02:06 -08:00
Jared Boone
2c64454172
More constructor style clean-up.
2015-11-11 09:35:28 -08:00
Jared Boone
d02698a6de
Apparent bug where min/max aren't initialized from value inside the buffer bounds.
...
The fix is less than ideal, it assumes that an incoming buffer length is always >= 1.
2015-11-11 09:30:15 -08:00
Jared Boone
ebf103363c
Constructor style clean-up.
2015-11-11 09:16:20 -08:00
Jared Boone
9f6c495fef
Add TPMS initial demodulator implementation.
...
Right now, 2FSK, 19200 baud, +/-38400Hz deviation. No effort is made to check CRC/checksums or decode packets.
2015-11-10 15:19:56 -08:00
Jared Boone
6cdef7026d
Remove spectrum window-presum due to lack of code RAM.
2015-11-10 15:16:27 -08:00
Jared Boone
99871dcb84
Move a few member variables to stack/constants.
2015-11-10 15:10:52 -08:00
Jared Boone
981c2fbfbd
Complete FSKProcessor's trip to being AISProcessor.
2015-11-10 15:04:38 -08:00
Jared Boone
111a5f10c0
Add some baseband constructors.
...
Some of them I think I took out earlier...
2015-11-10 14:04:50 -08:00
Jared Boone
add6171410
Move BasebandStatistics from heap to stack.
2015-11-10 13:59:17 -08:00
Jared Boone
0789d50fdf
Rework BitHistory, BitPattern, PacketBuilder.
...
Templatize PacketBuilder to optionally bit unstuff, and have flexible packet termination behavior.
2015-11-09 14:38:09 -08:00
Jared Boone
5dcca89172
FSKProcessor: remove separate channel filter.
...
RRC filter alone will do the trick!
2015-11-07 14:10:44 -08:00
Jared Boone
fc037c739a
Comment about correct MatchedFilter usage.
...
Because the filter expects a combined translate/rotate and low-pass filter in the taps, the taps must be a multiple of the translate sinusoid period.
2015-11-07 11:27:31 -08:00
Jared Boone
ae225e8c3b
Further MatchedFilter optimization using algebraic identities and stuff.
...
Can't stop premature optimization!!!
2015-11-06 09:40:05 -08:00
Jared Boone
100761481e
Fix inaccurate comment.
2015-11-06 09:40:05 -08:00
Jared Boone
3d5c8056d9
Premature optimization of MatchedFilter::shift_by_decimation_factor().
2015-11-06 09:40:05 -08:00
Jared Boone
4afcc83873
Mark MatchedFilter::is_new_decimation_cycle() as const.
2015-11-06 09:40:05 -08:00
Jared Boone
3c33e20156
Rename MatchedFilter::decimation_factor.
2015-11-06 09:40:05 -08:00
Jared Boone
7a59823211
Stop computing channel spectrum during FSK demod.
...
Data is unused, as screen is displaying decoded packets.
2015-11-06 09:40:05 -08:00
Jared Boone
ddd34793a6
Default constructors and configure methods for baseband classes.
2015-11-06 09:40:05 -08:00
Jared Boone
51df92a05a
Rename baseband_ais -> ais_baseband.
...
So that ais_baseband and ais_application filenames can be sorted near each other.
2015-11-06 09:40:04 -08:00
Jared Boone
26c23dc8a0
Use new FIR decimation in FSK demodulator.
...
Reduces FIR calculation effort when output samples are skipped at FIR filter, not after.
2015-11-06 09:40:04 -08:00
Jared Boone
86b068be62
Early calculation to reduce pressure on registers.
2015-11-06 09:40:04 -08:00
Jared Boone
a074e7d8d8
Remove commented code.
2015-11-06 09:40:04 -08:00
Jared Boone
424c0eac3f
FIRAndDecimateBy2Complex: expose decimation_factor, bring work function into class.
2015-11-06 09:40:04 -08:00
Jared Boone
cde15e4271
Generalize fir_and_decimate_by_2_complex_fast.
...
Permit decimation_factors other than 2.
Permit tap counts != 64 (but still must be multiple of 8).
Half the amount of tap memory required.
Performance is significantly degraded due to greater flexibility -- most likely due to separate sample buffer shift phase, instead of performing shift during output sample calculation.
2015-11-06 09:40:04 -08:00
Jared Boone
be78ed657f
Remove taps_count template arg for FIRAndDecimateBy2Complex.
...
Use heap to allocate samples and taps buffers, so filters of different lengths can be supported.
2015-11-06 09:40:04 -08:00
Jared Boone
0f73d6061a
Remove old decimating FIR code.
2015-11-06 09:40:04 -08:00
Jared Boone
015e5516d5
Update/consolidate AIS RRC matched filter taps.
2015-11-06 09:40:04 -08:00
Jared Boone
dab801e167
AIS RX tweak of clock recovery constant for better performance.
2015-11-06 09:40:03 -08:00
Jared Boone
58b97dea68
AIS RX performance improved with 32-tap RRC.
2015-11-06 09:40:03 -08:00
Jared Boone
f82fd1f8d7
Tease apart utility.hpp, other header dependencies.
...
Trying to get a host-testable FSK demodulator, and finding a lot of M4- and ChibiOS-specific code is getting included. Boo.
2015-11-06 09:40:03 -08:00
Jared Boone
e049097f49
Remove spurious commented code.
2015-11-06 09:40:03 -08:00
Jared Boone
4aae77f565
MatchedFilter improvements
...
Use single set of taps for positive and negative filters.
Reverse taps (since new samples are pushed into buffer from the high end).
Make complex multiply explicit to avoid fancy but irrelevant arithmetic checks.
Compute negative filter from conjugation of positive filter taps.
Move filter power and difference calculations into MatchedFilter.
2015-11-06 09:40:03 -08:00
Jared Boone
ab28639a3d
Use std::move to move samples in buffer.
...
Yes, std::rotate works, but it's fancy and does unnecessary work.
2015-11-06 09:40:02 -08:00
Jared Boone
4141d6fe0f
Untemplate MatchedFilter, a different way.
2015-11-06 09:40:02 -08:00
Jared Boone
fe94cfa45a
De-std::vector MatchedFilter, was chewing up far too much memory.
2015-11-06 09:40:02 -08:00
Jared Boone
64ed539554
Change LinearResampler.advance to external use only.
2015-11-06 09:40:02 -08:00
Jared Boone
4ed385d15e
Prioritize PacketBuilder found_end_flag() over packet_truncated().
2015-11-06 09:40:02 -08:00
Jared Boone
c2e7f9a6f4
Shorten AIS training sequence match length.
2015-11-06 09:40:02 -08:00
Jared Boone
d92c962c0c
Set MatchedFilter taps with separate method.
2015-11-06 09:40:02 -08:00
Jared Boone
8198db768d
Move some MatchedFilter code to .cpp file.
2015-11-06 09:40:02 -08:00
Jared Boone
aff7865c61
Move (some) AIS bits to a separate file.
2015-11-06 09:40:02 -08:00
Jared Boone
7a5100baf1
Enlarge packet payload size 256 -> 1024 bits.
2015-11-06 09:40:01 -08:00
Jared Boone
68250b4d30
Expose weight() of FixedErrorFilter.
2015-11-06 09:40:01 -08:00
