Hi Jeroen, Hey that's great work with working the new mode on a HackRF, is that about 50mW max?
Yes, FEC is a fine idea. A friend has been kind enough to generate the codes for me, however it's not a process that is automated or straight forward. Couple of options: 1/ Use an existing code. 2/ Use a code with more data bits than you require, and fill them with known bits at the encoder and decoder that you don't transmit. This effectively lowers the code rate a little. I do that for FreeDV 2020. 3/ Peruse the CML library codes and see if they have one that fits your use case, e.g. ldpcut.m There is an Octave utility to generate .[ch] files and run the codes in C. Cheers, David On 12/6/20 7:00 am, Jeroen Vreeken wrote: > Hi, > > The experiments with mode 6000 are going pretty well. > Another local HAM (PE1ITR) even managed to work our repeater with just a > HackRF. > Compared to analog FM it seems to perform pretty well. > > But I would like to take it a bit further and try to introduce some FEC. > Since the currently used codec2 mode only needs 3200bps there is still > plenty of room. > I was thinking about a rate 2/3 code (687 code bits for 458 data bits), > but I am a bit puzzled with the ldpc octave code. > How exactly do I generate the needed matrix (and ofcourse the C and > header files)? > > Regards, > Jeroen > > > > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
