249 Commits

Author	SHA1	Message	Date
Steven Franke	390884268c	Wholesale change from FST280 to FST240	2020-06-27 08:53:11 -05:00
Bill Somerville	451b6747b7	Spring cleaning	2020-06-03 15:27:49 +01:00
Steven Franke	3405687e89	Clean up in preparation for RC release.	2020-05-05 13:45:02 -05:00
Steven Franke	9b6dd092c5	Streamline decoding to use a single call to decode174_91.	2020-05-05 11:59:43 -05:00
Steven Franke	27b94e2cc7	Fix another bug.	2020-05-05 08:07:31 -05:00
Steven Franke	82e66f3251	Fix problems with ldpc174_91.f90	2020-05-05 08:05:58 -05:00
Steven Franke	093c403063	Implement coupled BP->OSD decoding for FT8/FT4.	2020-05-04 13:13:49 -05:00
Steven Franke	c3ba4178e6	Tweak the downsample filter bandwidth.	2020-05-04 13:09:05 -05:00
Steven Franke	b0ef40cb1d	Add routines for ft4slow based on (280,101) code.	2020-05-02 08:10:35 -05:00
Steven Franke	e82edf2365	Generalize ft4slowsim and ft4sd to work with arbitrary modulation index.	2020-04-28 07:21:13 -05:00
Steven Franke	7804ab5fc6	A simple hard-decision bit-flip decoder for LDPC codes.	2020-04-26 14:44:02 -05:00
Steven Franke	73e2aa9573	Add routines needed to test (240,101) qso mode.	2020-04-26 14:34:09 -05:00
Steven Franke	c2bcb460e1	Remove temporary (174,101) qsp stuff and revert to (174,74) with wspr-type messages.	2020-04-26 14:30:24 -05:00
Steven Franke	a0f9ea0075	Add a (240,101) code.	2020-04-23 11:54:02 -05:00
Steven Franke	edeb756257	Work on (174,101) encoding and decoding for ft4slow.	2020-04-22 10:36:48 -05:00
Steven Franke	3085047a96	Add routines to create wave files for ft4slow.	2020-04-22 08:00:34 -05:00
Steven Franke	8da98fee1e	Cleanup	2020-04-21 15:02:57 -05:00
Steven Franke	01d555c898	Add hybrid bp/osd decoder for (174,K) crc-aided code.	2020-04-21 13:46:43 -05:00
Steven Franke	529cc1bae1	Speed up wspr4d.	2020-04-21 13:44:24 -05:00
Steven Franke	03efe4d54a	Add shift jittering to improve performance on fading channels. Not yet optimized for speed.	2020-04-20 08:37:58 -05:00
Steven Franke	14f6c27025	wspr4d cleanup.	2020-04-18 08:05:23 -05:00
Steven Franke	041d0bf1f4	Fix bpdecode174_74.f90 to work with revised crc24 routine.	2020-04-17 15:06:22 -05:00
Steven Franke	c2d60afcf9	Make ldpcsim174_101 work.	2020-04-17 14:37:48 -05:00
Steven Franke	fae81b6b67	Add routines necessary to support a crc24-aided (174,101) code.	2020-04-17 14:11:12 -05:00
Steven Franke	b670353bbd	Cleanup and tweaks.	2020-04-16 08:55:17 -05:00
Steven Franke	4978f29e58	Add a new code.	2020-04-15 15:45:50 -05:00
Steven Franke	b8ff0941e8	Add wspr4d and support routines. Not yet working.	2020-04-15 15:45:07 -05:00
Steven Franke	c54f3b7e83	ldpcsim174_74: minor cleanup.	2020-04-15 07:59:57 -05:00
Steven Franke	7d52234371	Fix a bug in wspr4 signal generation.	2020-04-15 07:58:31 -05:00
Steven Franke	c5e2593979	Add routines necessary to generate simulated 'wspr4' wav files.	2020-04-14 10:34:00 -05:00
Joe Taylor	e82b9ffa38	Allow entry and decoding of WSPR-format message in ldpcsim174_74.	2020-04-13 15:43:34 -04:00
Steven Franke	65fa6aed6c	Add a new (174,74) LDPC code (regular, column weight 3) and supporting files.	2020-04-13 10:23:02 -05:00
Steven Franke	e972fbbfec	Change sync word to 4 concatenated 4x4 Costas arrays. Tweaks to optimize sync efficiency.	2020-04-07 13:18:41 -05:00
Steven Franke	1044342245	Use Joe's sync vector.	2020-04-05 14:40:19 -05:00
Steven Franke	583f9d2f0e	Comment out a debug write statement.	2020-04-03 10:39:51 -05:00
Steven Franke	cf5a69d25b	Updates and additions to wsprcpm files.	2020-04-03 10:27:43 -05:00
Steven Franke	0f2793dcbe	Update calls to bpdecode174_91.	2020-03-17 12:18:10 -05:00
Steven Franke	cf07d478ac	Some repairs and tweaks to development-related programs in fsk4hf directory.	2020-02-09 16:13:52 -06:00
Steven Franke	e9160f3c2f	Make ldpcsim174_91 work again. Scale SNR2500 assuming coherent BPSK, same Eb as FT8.	2020-02-08 14:49:21 -06:00
Steve Franke	66e3f11fba	Add ft4 files in lib/ft4.	2019-01-25 16:01:34 -06:00
Steve Franke	3bdbf19d1d	Make ft4sim and ft4d work.	2019-01-22 11:01:28 -06:00
Steve Franke	b4639b77d0	Fix CMakeLists.txt so that ft2_decode still builds. Fix a bug in ft4d - sync now seems to work.	2019-01-21 19:52:13 -06:00
Steve Franke	f2dc394c84	Add ft4 files; ft4sim works, ft4d is work in progress.	2019-01-21 19:31:54 -06:00
Steve Franke	f447fe49e1	Fix some indexing problems. Create subroutine ft2_gfsk_iwave.f90 for use with ft2.exe. Needs testing.	2019-01-17 15:25:06 -06:00
Steve Franke	7701516b43	ft2sim now creates a GFSK waveform with BT=1.0. It also adds raised cosine ramp up and down at the beginning and end of the transmission.	2019-01-17 14:01:40 -06:00
Bill Somerville	074914d607	Fix merge issues	2019-01-16 20:55:01 +00:00
Steve Franke	348e7c8ad5	In principle, ft2d can now decode multiple signals. Not yet tested.	2019-01-13 15:44:16 -06:00
Steve Franke	1fb89929a9	Make ft2d slightly more robust. Still very rough.	2019-01-13 10:58:35 -06:00
Steve Franke	cf1fe6c3d6	More work on FT2. New frame format is 16sync + 128codeword. Data chunk is assumed to be 2.5s long. A rudimentary sync routine is implemented which finds the single strongest signal.	2019-01-12 13:28:10 -06:00
Steve Franke	f63f0301eb	Tweak some decoder parameters for better performance.	2019-01-10 10:35:09 -06:00