2714 Commits

Author	SHA1	Message	Date
Joe Taylor	acd6d5cab9	Fix some bugs for more varied example messages.	2018-06-26 21:00:53 -04:00
Joe Taylor	c75a270872	Finish decoding of Types 1 and 3 (except for rpt/RRR/RR73/73).	2018-06-26 16:47:16 -04:00
Joe Taylor	b0636b561b	Basic function for message Types 0.0-0.5 and Type 1.	2018-06-26 16:34:38 -04:00
Joe Taylor	9d5a2e6f5a	Through type 0.3.	2018-06-26 15:20:39 -04:00
Joe Taylor	9ccb96397d	source-encode/decode of 77-bit messages OK through type 0.3.	2018-06-26 15:13:15 -04:00
Joe Taylor	2006fde28c	Completed pack77/unpack77 through message Type 0.2. Still more to do!	2018-06-26 13:55:12 -04:00
Steve Franke	03abada09b	More progress on sequence demodulator. Can now do nsymb=1,2, and/or 3.	2018-06-26 11:11:58 -05:00
Joe Taylor	0adcfc667f	Add files for source encoding and decoding of 77-bit messages.	2018-06-26 08:33:13 -04:00
Steve Franke	7684bd0e78	Work toward a generalized sequence detector for nsymbols=1, 2, or 3. Works for nsymbol=3, but not yet for nsymbol=1, or 2.	2018-06-25 17:01:34 -05:00
Joe Taylor	bd5aec3f31	More tweaks to description of 77-bit message types.	2018-06-23 15:15:10 -04:00
Joe Taylor	539ec3d465	test	2018-06-23 12:15:47 -04:00
Joe Taylor	35b53766cb	Add info on 28-bit integers used for standard callsigns.	2018-06-23 11:54:40 -04:00
Joe Taylor	7266d407ff	Amended rules for 77-bit message types.	2018-06-22 16:36:14 -04:00
Steve Franke	0f5759270e	Added 2-symbol sequence detection for proof-of-concept tests.	2018-06-22 11:20:28 -05:00
Joe Taylor	f962caace4	Implement a valid scheme for computing S/N in JT4 mode. ... (cherry picked from commit f8bb7f447743a19129d3603dc0841fa16f80b308)	2018-06-21 23:25:36 +01:00
Joe Taylor	2edcebef40	Further progress toward defining the 77-bit message types.	2018-06-21 15:38:08 -04:00
Joe Taylor	96f3fa5810	Add directory 77bit and its contents.	2018-06-21 10:51:19 -04:00
Joe Taylor	f8bb7f4477	Implement a valid scheme for computing S/N in JT4 mode.	2018-06-18 13:41:26 -04:00
Steve Franke	3f8c218ebe	Make changes to ft8b_2.f90 to accommodate the new 77-bit in/out encoding/decoding routines. With these changes, WSJT-X decodes (174,91) frames.	2018-06-17 12:11:32 -05:00
Steve Franke	1a31e5b2d6	For (174,91) code, move CRC generation and testing into encode and decode routines. Make ldpcsim174_91.f90 work with the new encode/decode routines.	2018-06-17 08:44:10 -05:00
Steve Franke	2cdb164446	Move CRC13 creation into encode128_90.f90 and CRC checking into bpdecode128_90.f90.	2018-06-16 16:42:02 -05:00
Steve Franke	e16e78790a	Create chkcrc13a.f90. Should chkcrc12a, chkcrc13a, and chkcrc14a be combined into one routine?	2018-06-16 09:04:51 -05:00
Steve Franke	c18338b83b	Fix the calculation of symbol error probability.	2018-06-16 09:03:32 -05:00
Steve Franke	6846964170	Add 'code b' - a better (128,90) code. Code b has irregular column weights - 80% weight 3 and 20% weight 4.	2018-06-14 15:38:58 -05:00
Joe Taylor	67b5c80e1a	Update the contest ideas.	2018-06-14 11:31:16 -04:00
Steve Franke	1aeaa1715b	Fix up ldpcsim144 for comparisons with ldpcsim128_90.	2018-06-14 09:59:49 -05:00
Steve Franke	5da3986f0a	More work on (128,90) code. ldpcsim128_90 works now.	2018-06-14 09:30:41 -05:00
Joe Taylor	0344c14f99	Add the white paper digi-contest.txt.	2018-06-14 10:14:30 -04:00
Steve Franke	3ac119fb99	Progress toward a working ldpc128_90 simulator. Compiles, but does not yet work.	2018-06-13 11:34:00 -05:00
Steve Franke	41920af89a	Add routines that will implement 77-bit messages for MSK144. Initial tests will use a (128,90) code.	2018-06-13 09:40:04 -05:00
Steve Franke	9b63fe6ac7	Fix a bug in ldpcsim144 so that nerrhisto.dat is calculated and printed.	2018-06-12 16:00:06 -05:00
Steve Franke	a5837bd5c7	AP decoding now works for type 2 frames. Also cleaned up and simplified AP implementation in ft8b_2.	2018-06-11 15:10:44 -05:00
Steve Franke	6fe9e8f860	Remove the need to re-order the parity-check matrix columns for compatibility with the generator matrix. Redefine the codeword to have the form [91 message bits|83 parity bits].	2018-06-09 13:05:11 -05:00
Steve Franke	68beed88a7	Change to Gray bit to symbol mapping for (174,91) messages.	2018-06-08 16:21:21 -05:00
Steve Franke	a3d9cf8bcd	Fix a bug that could cause all log-likelihoods to be NaN in some cases.	2018-06-07 14:24:35 -05:00
Steve Franke	a0db6a8a08	Disable AP passes for type 2 frames, for now. Write some diagnostics to lun 81.	2018-06-07 11:40:25 -05:00
Steve Franke	b84602d059	Zero the apsymbols for type 2 frames, for now.	2018-06-06 11:28:44 -05:00
Steve Franke	a23e2b6f8b	Fix a bug that caused some second-decoding-attempt log-likelihoods to become NaN.	2018-06-06 11:21:00 -05:00
Steve Franke	badc639777	Fix a bug in sync8d.f90. Switching between Costas arrays should work now.	2018-06-06 10:59:49 -05:00
Steve Franke	48b60eab71	Make two sync passes, one for each sync array. Label candidates with their type and decode accordingly.	2018-06-05 16:44:52 -05:00
Steve Franke	772b1bd5fa	ft8sim can now generate old (174,87) or new (174,91) frames. Frame type is selected using the itype command line parameter.	2018-06-05 08:40:00 -05:00
Steve Franke	86a5ae6596	costasxcorr is a Gnu Octave script that calculates the cross correlation between Costas arrays.	2018-06-04 14:06:14 -05:00
Steve Franke	c4ee0a2b41	Replace all references to code a with references to code c.	2018-06-04 08:04:22 -05:00
Steve Franke	689711ff1f	Add definitions for a new and improved (174,91) code - called code c	2018-06-04 08:04:22 -05:00
Steve Franke	01a380084d	Changes to make it easier to test different codes.	2018-06-04 08:04:22 -05:00
Steve Franke	358081f280	Changes necessary to build ldpcsim174_91.f90.	2018-06-04 08:04:22 -05:00
Steve Franke	87f5510999	ldpcsim174_91 now works	2018-06-04 08:04:22 -05:00
Steve Franke	84c153f9a9	Really add the new encoder and decoders.	2018-06-04 08:04:22 -05:00
Steve Franke	7a228d8f7d	Starting to implement a (174,91) code.	2018-06-04 08:04:22 -05:00
Steve Franke	aeee9b62bb	Hack CMakeLists.txt so that repo will build. ... Modify CMakeLists.txt so that wspr5sim, wspr5d build.	2018-06-04 08:04:22 -05:00