37 commits

Author	SHA1	Message	Date
Ahmet Inan	da33b7b68c	candidates are sorted now	2024-03-09 16:09:50 +01:00
Ahmet Inan	ca8546deb1	use the faster second version of the estimator	2021-09-10 23:56:42 +02:00
Ahmet Inan	c223befa1a	use the repeated median estimator of Siegel	2021-09-10 00:15:21 +02:00
Ahmet Inan	96ea292b0c	estimate SFO by cross-correlating S&C symbols	2021-09-07 00:19:06 +02:00
Ahmet Inan	56bd51012c	show a dot for each symbol demodulated	2021-09-06 16:11:15 +02:00
Ahmet Inan	ba102a5799	added next_sample()	2021-09-06 12:12:13 +02:00
Ahmet Inan	daa47615d3	do the demodulation online using the first preamble	2021-09-06 00:06:33 +02:00
Ahmet Inan	7b45ee894d	use the Theil-Sen estimator on each symbol	2021-09-03 20:52:47 +02:00
Ahmet Inan	8d62a3c90b	estimate SFO and CFO via simple linear regression ... and compensate by correcting constellation points	2021-09-03 20:52:47 +02:00
Ahmet Inan	5c2743f5e7	do not resample	2021-09-03 20:52:47 +02:00
Ahmet Inan	99b6a4e963	use a shortened systematic polar code and CA-SCL decoding ... using SPC(64800, 43072): mode 6: 8PSK, 2700 Hz BW and about 10 seconds long mode 7: 8PSK, 2500 Hz BW and about 11 seconds long mode 8: QPSK, 2500 Hz BW and about 16 seconds long mode 9: QPSK, 2250 Hz BW and about 18 seconds long using SPC(64512, 43072): mode 10: 8PSK, 3200 Hz BW and about 9 seconds long mode 11: 8PSK, 2400 Hz BW and about 11 seconds long mode 12: QPSK, 2400 Hz BW and about 16 seconds long mode 13: QPSK, 1600 Hz BW and about 24 seconds long	2021-09-03 20:52:09 +02:00
Ahmet Inan	3665d495b7	added demod_or_erase() helper function	2021-08-29 17:47:20 +02:00
Ahmet Inan	d1adc5c5ca	erase constellation points outside of radius two	2021-08-28 18:00:19 +02:00
Ahmet Inan	1d02d34e8c	Revert "increased guard interval to 1/4" ... This reverts commit 7c7ed0ffd7.	2021-08-25 11:41:02 +02:00
Ahmet Inan	7c7ed0ffd7	increased guard interval to 1/4 ... to reduce ISI and support sample rates 11025 Hz and 22050 Hz	2021-07-27 13:14:00 +02:00
Ahmet Inan	8d5d7fc0c2	use the DVB recommended T=10 BCH code	2021-07-21 17:15:47 +02:00
Ahmet Inan	6f99db1444	improve CFO estimation using hard decision	2021-07-21 00:12:59 +02:00
Ahmet Inan	357a90805c	use a simpler estimation for finer CFO	2021-07-20 21:47:49 +02:00
Ahmet Inan	ef152cc53f	scramble user data only using Xorshift32	2021-07-18 04:48:32 +02:00
Ahmet Inan	2645f96056	added support for various operation modes: ... mode 2: 8PSK, 2700 Hz bandwidth and about 10 seconds long mode 3: 8PSK, 2500 Hz bandwidth and about 11 seconds long mode 4: QPSK, 2500 Hz bandwidth and about 16 seconds long mode 5: QPSK, 2250 Hz bandwidth and about 18 seconds long	2021-06-16 19:54:55 +02:00
Ahmet Inan	463836c41f	made number of active carriers a constructor argument	2021-06-16 15:16:01 +02:00
Ahmet Inan	82c279f13b	minor cleanup	2021-06-13 14:45:44 +02:00
Ahmet Inan	5a6e5cd995	removed payload CRC check: let user decide	2021-06-13 14:35:51 +02:00
Ahmet Inan	c87bfc6e78	added nrz() helper function	2021-06-13 14:19:46 +02:00
Ahmet Inan	5f4c2cdba9	compute descrambled constellations only once	2021-06-13 11:50:55 +02:00
Ahmet Inan	4683e531fe	handle erasures produced by LDPC decoding	2021-06-12 13:27:08 +02:00
Ahmet Inan	a1c0ab3d25	interleave bits for improved LDPC performance	2021-06-12 12:15:34 +02:00
Ahmet Inan	a07fe52134	scramble I and Q using two independent sequences	2021-06-11 22:52:01 +02:00
Ahmet Inan	30f39ce41b	estimate SNR using corrected symbols	2021-06-11 11:12:52 +02:00
Ahmet Inan	7e362ae224	estimate SNR using hard decision	2021-06-11 11:12:52 +02:00
Ahmet Inan	7ba95fb000	added LDPC forward error correction	2021-06-11 11:12:52 +02:00
Ahmet Inan	0e9f46efd1	added BCH forward error correction	2021-06-11 11:12:52 +02:00
Ahmet Inan	79c0aaf998	minor cleanup	2021-06-11 11:12:52 +02:00
Ahmet Inan	cc3e9cc10f	added CRC check of payload	2021-06-11 11:12:52 +02:00
Ahmet Inan	361779211c	use bitman.hh	2021-06-11 11:12:52 +02:00
Ahmet Inan	aa28a2e58d	pass user data using uint8_t array	2021-06-11 11:12:52 +02:00
Ahmet Inan	3546d516b1	Initial commit	2021-06-11 11:12:44 +02:00