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
