Steven Franke
1d2a0f39ac
Tweak SNR calibration for better tracking at low SNR.
2020-05-03 08:51:55 -05:00
Steven Franke
db773cf7dd
Make a change to decrease the number of false decodes.
2020-05-02 10:45:04 -05:00
Steven Franke
c43e58792c
Work-in-progress hybrid bp/osd decoder for FT8.
2020-04-26 14:45:39 -05:00
Joe Taylor
00e8027c29
Implementing new Type 5 messages for EU VHF contests.
2020-04-21 13:48:47 -04:00
Joe Taylor
d5e92202d0
Silence compiler warnings; reformmat some source code.
2020-03-19 13:13:33 -04:00
Joe Taylor
7564301209
Silence compiler warnings.
2020-03-19 11:43:22 -04:00
Joe Taylor
a6089bc196
Silence compiler warnings.
2020-03-19 11:27:57 -04:00
Joe Taylor
4fa3ee3437
Silence compiler warnings.
2020-03-19 10:43:45 -04:00
Steven Franke
8f7221825f
First cut at setting up Fast/Normal/Deep parameters.
2020-03-17 08:51:37 -05:00
Steven Franke
cf5aab0088
Allow up to 500 pre-candidates.
2020-03-09 14:03:53 -05:00
Steven Franke
d57b84be27
More changes to increase ft8 decoder yield.
2020-03-08 12:03:52 -05:00
Steven Franke
fa071324e5
subtractft8: Delete unused variable, i1
2020-03-06 13:21:04 -06:00
Steven Franke
3467ee7924
Make Normal decode the same as Deep except no DT refinement at nearly=47.
2020-03-06 11:54:28 -06:00
Steven Franke
f2266c3c54
1. subtractft8: on the last call to sqf, don't need to do the long FFT.
...
2. mainwindow.cpp: based on the time when <DecodeFinished> is received, calculate
mswait to try to place the killFile time at 0.75*m_TRperiod.
2020-03-06 11:06:44 -06:00
Joe Taylor
f367b6d6b9
Temporary version: decode call at 47 buffers only does subtractions.
2020-03-06 10:38:24 -05:00
Joe Taylor
431ec50212
Progress toward decoding at 41/47/50 buffers. Not yet complete!
2020-03-05 15:37:31 -05:00
Joe Taylor
02eb4fe90b
Use a table lookup for exp(i*phi) in gen_ft8wave.f90.
2020-03-03 12:40:27 -05:00
Steven Franke
761ee1cd85
Merge branch 'develop' of bitbucket.org:k1jt/wsjtx into develop
2020-02-29 13:47:09 -06:00
Steven Franke
037805ca8f
Improve dt estimation in ft8b so that dt refinement procedure in subtractft8.f90 can be done with 4 calls to sqf instead of 7.
2020-02-29 13:46:59 -06:00
Joe Taylor
f9322f2b43
Add calls to timer() around calls to subtractft8().
2020-02-28 11:25:32 -05:00
Joe Taylor
00210d1141
Minor code cleanup in subtractft9.f90.
2020-02-26 13:14:49 -05:00
Joe Taylor
65fda32a05
Previous commit was in error. This is the best-performing subtractft8.f90.
2020-02-25 09:04:18 -05:00
Joe Taylor
ff46c5a0c4
In subtractft8.f90: refine DT for early decodes before subtracting them from dd().
2020-02-24 16:18:42 -05:00
Joe Taylor
adb7dfcac3
Satisfy fussy compilers like gcc 10: Type mismatch between actual argument at (1) and actual argument at (2)
2020-02-21 09:52:20 -05:00
Steven Franke
ac1d0f837d
Comment out diagnostic write statement.
2020-02-17 10:56:47 -06:00
Steven Franke
20b942b802
FT8: Add an experimental 4'th bit metric. Make dupe removal unconditional.
2020-02-17 10:53:52 -06:00
K9AN
207fd05f9f
Minor simplification - remove unnecessary nint() functions in get_spectrum_baseline.f90
2020-02-14 16:54:56 -06:00
Steven Franke
09b47b0e8e
Change lower limit of analysis window from 200 Hz to 100 Hz.
2020-02-14 15:28:16 -06:00
Joe Taylor
4a4864d2ae
FT8 early decoding is now working.
2020-02-13 15:05:37 -05:00
Steven Franke
ff109a60ca
Implement AP decoding for Hounds when Fox has a compound call with standard base call.
2020-02-03 10:48:51 -06:00
Steven Franke
70b84478f0
Add WW_DIGI to the special activities section. Make necessary changes to
...
the decoders. Also, an experimental change to the FT4 decoder to base
AP decoding passes on 4-symbol block detection instead of single symbol
detection. This provides about 1 dB improvement on the AWGN channel.
Sensitivity changes on other channels are TBD.
2020-01-24 11:26:36 -06:00
Joe Taylor
f069477dbb
Bring test28.f90, ft4_testmsg.f90, ft8_testmsg.f90, ft8code.f90 up to date.
2020-01-03 13:34:56 -05:00
Joe Taylor
3397bf49b4
Add utility program ft4code.
2019-12-18 10:02:00 -05:00
Steve Franke
a0d471cb0b
Improve FT8 SNR estimates in two ways:
...
(i) SNR no longer saturates at +20 dB
(ii) a large signal in the passband no longer causes the
SNR of weaker signals to be biased low.
2019-11-27 15:58:52 -06:00
Steve Franke
091b7f03ed
Delete un-needed file.
2019-11-27 15:57:40 -06:00
Steve Franke
d1530b0c19
Rename ft8sim files as follows:
...
ft8sim_gfsk.f90 => ft8sim.f90
ft8sim.f90 => ft8sim_fsk.f90
This change reflects the fact that the GFSK waveform is now used in WSJT-X
for ft8 and ft4.
2019-11-27 09:08:17 -06:00
Steve Franke
f224790569
Tweak for consistency.
2019-07-12 10:41:09 -05:00
Joe Taylor
396bf1a013
Correct a flaw in ft8sim when generating data with large abs(DT).
2019-06-17 11:26:46 -04:00
Steve Franke
3611be8ba0
Try to avoid an array bounds error that has been reported by a user. Cause unknown.
2019-05-03 10:51:45 -05:00
Bill Somerville
cf2219173a
Squash a SEGV
2019-04-20 01:14:23 +01:00
Steve Franke
e8d17a9898
FT4: Subtraction is basically working.
2019-04-18 14:16:39 -05:00
Steve Franke
be72461142
FT4: Some groundwork for subtraction.
2019-04-18 14:15:24 -05:00
Steve Franke
f296e37630
Fix a bug that didn't show up when I compiled on the Mac.
2019-04-12 18:54:33 -05:00
Steve Franke
cd8ea16f40
FT8: Use GFSK waveform with BT=4.0 as reference for subtraction, for now. May want to change to BT=2.0 before v2.1 release?
2019-04-12 17:11:26 -05:00
Bill Somerville
278c544a6a
Merge branch 'develop' into feat-ft2
2019-02-26 11:52:14 +00:00
Steve Franke
3759198982
Remove ramp-up and ramp-down symbols. Instead, shape the first 1/8th of first and last real symbols.
2019-02-25 15:03:43 -06:00
Steve Franke
ec2d5b6233
Fix the sign of one of the Nuttal window coefficients. Change BT to 2.0.
2019-02-25 12:57:34 -06:00
Steve Franke
17ac99344c
For now, change to BT=1.5 for FT8. This commit enables the waterfall analysis window. This decreases sidelobes significantly in exchange for increased noise bandwidth. Sensitivity to weak tones will be degraded somewhat.
2019-02-23 14:18:22 -06:00
Steve Franke
5d914a1eb1
Make ft8sim_gfsk work with recent changes to gen_ft8wave.f90.
2019-02-22 15:16:29 -06:00
Joe Taylor
25bfa3798a
Transmit FT8 using a gaussian-filtered waveform.
2019-02-22 13:39:39 -05:00
