7 Commits

Author	SHA1	Message	Date
Manolis Surligas	767e4e3d38	Redesign of the AX.25 decoder ... This commits introduces a significant redesign of the AX.25 decoding block. Due to the poor AX.25 sync flag, the decoders exhibited too many false alarms. To deal with this problem, we introduced the quadrature demod filter block, that tried to measure the SNR based on the running variance of the signal. The problem with that was that the user should have to fine tune two parameters, the one related with the amplitude of the incoming signal and the second one related with the window that the calculations should take place. This solution worked until now, but we can always increase the performance. The new AX.25 decoder stores the bitstream in a queue and always tries to exlpoit possible valid frames in the queue. If now sync flags have been encountered, the queue is flushed. After a valid frame extraction, bits corresponding to this frame are also deleted from the queue. This technique requires more memory and CPU, but it increases a lot the decoding performance.	2019-07-18 16:39:26 +03:00
Manolis Surligas	f235c5f68c	Remove AX.25 address field check	2019-07-03 15:41:08 +03:00
Manolis Surligas	a797d9bb7b	Use AX.25 address field to reduce false alarms	2018-03-24 23:59:56 +02:00
Manolis Surligas	2fb1bfadfc	Fix AX.25 encoder/decoder ... * Force the left over scrambled bits into the LFSR to be transmitted * Refactor the decoding process	2018-03-20 20:40:13 +02:00
Manolis Surligas	5056189d5e	Improve the performance of AX.25 decoder ... * Decrease false frame detection alarms that can reduce the number of succesfully decoded frames * Fix and improve the AX.25 bit stuffing mechanism	2016-08-07 02:11:59 +03:00
Manolis Surligas	6d4d51b825	Fix bug at AX.25 bit stuffing on the decoder	2016-07-07 17:57:06 +03:00
Manolis Surligas	1c30dfe145	Add AX.25 decoder with legacy support for the hardware radios	2016-07-02 00:18:44 +03:00

Renamed from lib/ax25_decoder_b_impl.h (Browse further)