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235 Commits

Author SHA1 Message Date
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
Steve Franke
d9c99601ae Fix bugs in gen_ft8wave.f90. 2019-02-21 15:56:21 -06:00
Steve Franke
1acb5d5d99 Add routines needed to test FT8 with GFSK pulses. 2019-02-21 15:48:02 -06:00
Bill Somerville
7d66f442d6 Fix up some compiler errors when using gfortran v9 2019-02-10 20:43:51 +00:00
Steve Franke
c52f755afc Make Watterson simulator causal. 2019-01-25 16:26:13 -06:00
Bill Somerville
aee9c09851 Merge branch 'develop' into feat-ft2 2019-01-16 20:44:44 +00:00
Steve Franke
8f1baae048 If delay=0.0 make Watterson use only a single component to simulate flat fading. 2019-01-13 09:25:30 -06:00
Steve Franke
c4d078f55f Remove unnecessary character string space-padding. 2019-01-03 14:02:17 -06:00
Steve Franke
1a8ddad307 In ft8apset, mycall and dxcall must be at least 3 characters long, otherwise they are treated as non-existent. 2018-12-24 11:19:07 -06:00
Steve Franke
b44d7b472d Fix a typo. 2018-12-24 10:49:40 -06:00
Steve Franke
318ce0020e Try harder to ensure that we don't waste time trying to do ap decoding that would involve nonstandard calls. Current code does not support ap decoding with non-standard calls. 2018-12-24 10:45:02 -06:00
Steve Franke
5034e21291 Remove some diagnostic writes. 2018-12-21 09:51:39 -06:00
Steve Franke
7a40bf2e4b Use separate hash tables for 10, 12, and 22 bit hashes. Make unpacking i3=4 messages depend on whether unpack is being done on a received message, or a to-be-transmitted message. Give mycall13 priority over hash table entries in certain contexts. 2018-12-20 15:08:29 -06:00
Steve Franke
307948a25d Remove an unused array. 2018-12-16 11:55:36 -06:00
Steve Franke
dfceef3662 Fix up ft8sim so that it prints a warning when SNR is set too high so that data will be clipped. 2018-12-07 11:10:25 -06:00
Steve Franke
337bae6d0d Housekeeping. Remove unused code and unused variables. Silence some compiler warnings. 2018-12-05 16:06:33 -06:00
Steve Franke
a5e82ac94c Delete an unused routine. Fix a typo in a comment. 2018-12-04 20:01:55 -06:00
Steve Franke
6fc27d550d Fix an egregious bug and another not-so-egregious bug. The egregious bug prevented decodes of most signals with negative DT. 2018-12-03 07:18:52 -06:00
Steve Franke
df37d9b1f7 Remove cqhund stuff and some other unused code. 2018-11-30 13:46:54 -06:00
Joe Taylor
461b87f047 Minor improvement in code that checks for bad FT8 messages. 2018-11-27 15:34:01 -05:00
Joe Taylor
9e74125799 Don't allow an illegal message to crash routine genft8(). 2018-11-27 15:26:24 -05:00
Steve Franke
ab34db7556 Get rid of unused variable ldecode77. 2018-11-05 14:40:55 -06:00
Joe Taylor
0235cf69ff Remove all vestiges of old (isync=1) FT8 mode. Many changes here! 2018-11-05 11:59:48 -05:00
Steve Franke
2b48cc4487 Update wsprd README and delete an obsolete program. 2018-10-31 21:02:46 -05:00
Steve Franke
87b97039b6 Remove a small bias in Watterson channel simulator channel amplitude. 2018-10-25 16:39:17 -05:00
Steve Franke
17ed242878 Minor tweak - make program name the same as file name. 2018-10-19 19:45:38 -05:00
Steve Franke
d0f0d420a9 Convert ft8sim.f90 to use 77bit messages. Remove ft8sim2.f90. 2018-10-19 16:52:00 -05:00
Steve Franke
fffa692ac5 Convert ft8code to 77bit messages. 2018-10-19 16:36:32 -05:00
Steve Franke
59278b9b6b Tweak ndeep determination. 2018-10-10 16:06:53 -05:00
Steve Franke
4b54873c81 Implement AP for all contest modes and also for Hound mode. AP is always active for Hounds. AP is automatically disabled if MyCall or DxCall are extended callsigns. 2018-10-04 17:48:55 -05:00
Steve Franke
0b3b050221 First cut at AP decoding for all values of ncontest. 2018-10-04 17:48:23 -05:00
Steve Franke
876f69b1d7 Remove some debug print statements. 2018-10-04 17:47:52 -05:00
Steve Franke
b993935494 Reconfigure foxgen.f90 for 77bit messages. Fox now transmits only 77bit messages. 2018-10-04 17:47:36 -05:00
Steve Franke
b5cc35e430 Cleaned up and simplified AP decoding. Enabled AP decoding for ncontest=0 and ncontest=4 (RU) so far. Missing MyCall or DxCall or nonstandard calls will disable AP passes that wouldn't make sense. 2018-10-04 17:45:15 -05:00
Steve Franke
77bb49e9ac Beginnings of AP for RU. Not working yet. 2018-10-04 17:44:34 -05:00
Joe Taylor
6cecef42aa Restore a missing call to unpack77(). 2018-10-04 16:09:02 -04:00
Steve Franke
d9cf9bed3c Better handling of decodes with unhashed callsigns. 
(cherry picked from commit 3b783a083e)
 2018-09-28 17:07:28 -05:00
Steve Franke
13b5cc479b Fix and re-enable polyfit SNR. 2018-09-26 08:29:01 -05:00
Steve Franke
669d54197d Polynomial-fit SNR is still not right. Disable it again, for now. 2018-09-24 19:36:30 -05:00
Steve Franke
591de66a31 Fix up SNR calculation so that it reverts to SJF SNR when polyfit SNR is not sane. 2018-09-24 19:04:34 -05:00
Steve Franke
9075fef228 Revert to Steve's SNR estimator, for now. 2018-09-24 17:40:14 -05:00
Steve Franke
332a3f1561 Calibrate noise-baseline-fit based SNR estimate for FT8 v2 and print those estimates with decodes. 2018-09-23 13:03:20 -05:00
Joe Taylor
705004d206 Initialize i3, n3 before two more calls to pack77(). 2018-09-19 13:05:32 -04:00
Joe Taylor
653e53b125 Apply the fix for i3, n3 before calling pack77() in genft8_174_91.f90. 2018-09-19 11:48:30 -04:00
Joe Taylor
aca7273fc3 Correct the sizes of character variables msg and msgsent. 2018-09-13 12:39:08 -04:00
Joe Taylor
a9deb8c1fd Merge branch 'integrate-77bit' of bitbucket.org:k1jt/wsjtx into integrate-77bit 2018-09-13 09:51:34 -04:00
Joe Taylor
d82949c54e Correct the display of usage examples. 2018-09-13 09:50:34 -04:00
Steve Franke
642540ff8f unpack77 now returns logical variable unpk77_success, which will be .false. if there is something obviously wrong with the message. Still to do: set the flag if the unpacked message contains CQ in an implausible place. 2018-09-12 15:06:26 -05:00
Steve Franke
629d061e30 Move a couple of simulation files to fsk4hf, which will eventually be excluded from releases. 2018-09-12 13:46:40 -05:00
Joe Taylor
ca2c1a2b8b Don't use "appendage" ~ or ! on decoded lines. Protect against bad read in genft8_174_91. 2018-09-02 18:55:13 -04:00
Joe Taylor
a8ad1569cc Protect against a potential bounds error. 2018-08-31 10:47:31 -04:00
Joe Taylor
201b29993c More fixes related to nonstandard calls. 2018-08-29 14:18:56 -04:00
Steve Franke
20cfae891e Make sync8.f90 more robust. Increase number of candidates to 300. 2018-08-08 09:29:08 -05:00
Steve Franke
f7d423296f Minor code cleanup. 2018-07-29 17:15:02 -05:00
Steve Franke
b67589d29f Bring isync=1 message simulator, ft8sim, up to date. Fix ap decoding for isync=1 messages. 2018-07-29 16:29:11 -05:00
Steve Franke
df0b5e2622 Progress on AP decoding for 77bit messages. AP is basically working for regular i3=1 messages. 2018-07-28 17:32:45 -05:00
Steve Franke
750bf569f3 ft8sim2: make it easier to identify callsign and grid bits in simulated messages. 2018-07-28 09:26:54 -05:00
Steve Franke
bee1ecd109 Detect and reject messages with invalid i3 and or n3. 2018-07-28 08:50:50 -05:00
Joe Taylor
017629ac36 Suppress any "QU1RK" decodes, they are necessarily bad. 2018-07-27 10:43:58 -04:00
Steve Franke
59f713ba76 The change committed to decodedtext.cpp fixes a crash that occurred when processing certain isync=2 decodes. Is this the right fix? Other changes are minor code cleanups. 2018-07-17 17:48:23 -05:00
Steve Franke
ab7c811552 Remove bcontest from ft8sim2.f90 so that it works. 2018-07-17 16:55:22 -05:00
Joe Taylor
2c5dd053f3 Don't send "mygrid" where it's no longer needed. 2018-07-11 16:32:08 -04:00
Joe Taylor
14385611be Code cleanup related to "bcontest". Auto-seq now OK for new NA VHF Contest messages. 2018-07-11 10:13:42 -04:00
Joe Taylor
c1e71a46ef Remove more "bcontest" stuff from Fortrn code. 2018-07-10 15:32:59 -04:00
Joe Taylor
d95d2df5b6 Old-style "NA VHF Contest" mode removed from all Fortran routines. 2018-07-10 15:09:42 -04:00
Steven Franke
e7b19b29b0 Screen out FT8 decodes with excessively large number of hard errors. These are almost certainly undetected errors. 2018-07-08 13:29:12 +00:00
Steven Franke
8eb58a47ba Fix a problem in ldpcsim174_91.f90. 2018-07-08 13:19:22 +00:00
Steve Franke
fd0ad33028 MSK144: Wholesale changeover to (128,90) code with 77-bit messages. Compiles and doesn't crash, but communication between two instances has not been tested. 2018-07-07 10:35:59 -05:00
Steve Franke
42f75bf404 Fix graymap. 2018-07-07 08:18:31 -05:00