18 Commity (aa9fcc26b70d505ccff71eca9154f7de4cbef737)

Autor	SHA1	Wiadomość	Data
Niccolò Izzo	aa9fcc26b7	Remove useless DC bias in quantization ... TG-81	2022-05-27 21:48:47 +02:00
Niccolò Izzo	d1651a702c	Add proper DC-bias removal, tuned EMAs	2022-05-27 21:48:47 +02:00
Silvano Seva	beca0d2acc	Reorganised constants inside M17 demodulator class	2022-05-27 21:48:47 +02:00
Silvano Seva	fda0fed5e7	Moved constant specifying sample rate for M17 baseband decoding from hwconfig.h files to M17Demodulator class	2022-05-27 21:48:47 +02:00
Silvano Seva	54a89abcd0	Removed a printf left behind after debugging from M17 demodulator class and slightly cleaned up the code	2022-05-27 21:48:47 +02:00
Silvano Seva	427c5f50b3	Made M17Demodulator::update() return a boolean indicating when a new decoded frame is ready	2022-05-27 21:48:47 +02:00
Niccolò Izzo	77aead675a	Improve runtime performance of M17 Demodulator ... Tweaked the exponential moving average alpha factors to improve the reactivity of the M17 demodulator. TG-81	2022-05-27 21:48:47 +02:00
Niccolò Izzo	5ef145cd39	Add fuzzy syncword validation ... Now syncword match is not exact but can tolerate up to two erroneous bits. TG-81	2022-05-27 21:48:47 +02:00
Niccolò Izzo	ca49b306b9	Update constants for M17 demodulation ... Constants were updated to increase performance based on baseband sample collected with Module17. TG-81	2022-05-27 21:48:47 +02:00
Niccolò Izzo	2d8c696a09	Complete M17 demodulator implementation ... Make quantization work also on DC offset signal Add samples plot code Fix bug in buffer wrap around Fix oob memory access in M17 modulator Update tests with DC offset signal Switch to 48KHz sample rate for Module17 and MD380 Add DC biasing script TG-81	2022-05-27 21:48:46 +02:00
Niccolò Izzo	ae26cca46f	Remove SPS ... Now M17_SAPLES_PER_SYMBOL is computed dinamically from sample rate. TG-81	2022-05-27 21:48:46 +02:00
Niccolò Izzo	a091bca35f	M17 Demodulator bugfixes ... Fixed several bugs in the M17 Demodulator code. TG-81	2022-05-27 21:48:46 +02:00
Niccolò Izzo	7a9bbfcaf2	Demodulator bugfix ... Fix several bugs in the demodulator code, tipycally sign errors.	2022-05-27 21:48:46 +02:00
Niccolò Izzo	1a9b3c4168	Implement M17 demodulator logic ... Implemented frame wrapping logic and demodulator loop.	2022-05-27 21:48:46 +02:00
Silvano Seva	963fbdc141	M17 mode handler: calling demodulator update function when in RX mode	2022-05-27 21:48:46 +02:00
Niccolò Izzo	5bf4df75ba	Fine tune demodulator to OpenRTX M17 baseband ... Fine tuned M17 demodulator with code generated from OpenRTX itself. TG-81	2022-05-27 21:48:46 +02:00
Niccolò Izzo	3163dd49d7	Add M17 demodulator code and tests ... Added implementation of the M17 4FSK demodulator, including clock recovery, phase detection, and quantization algorithms. A testsuite is also included to do regression testing against a reference baseband pre-generated and the corresponding reference bitstream. A 1% BER is still present due to a fault likely in the RRC filtering, since the eye diagram of the filtered stream is bad. TG-81	2022-05-27 21:48:46 +02:00
Niccolò Izzo	c648ffe377	Add draft of M17Demodulator class	2022-05-27 21:48:46 +02:00