Hi Bruce,
On 24-10-12 17:44, Bruce wrote: > Given what Jean-Marc wrote about the first VQ index, it probably rates > higher than energy. If David and/or Steve can confirm this; it makes sence to incorperate this in the search for a good interleaver. >> Maybe I don't understand. Are you laboring under the misconception >> that FEC must duplicate the data? Convolutional codes, even such old >> things as CRC, will expand the data at less than a 1:1 ratio. I think >> you can assume that we're using a more modern code like LDPC or turbo >> codes. >> Remember that we are using golay and hamming, because of the >> availability of open source code and we are pretty sure there are no >> patents applied here. Bill can probably elaburate better on that. > Golay and Hamming are easy to use for a fast way to get on the air, but > when we set a standard for other hams to use it should be based on a > capacity-approaching code. True, and once we get to the "DX" profiles we will probably group 1, 2, 4, 8 or 16 frames together to increase resistance to slow fading; we can implement these other codecs. So, me too, I am interested in experimenting with this; so the general framework you proposed does make sence. However, one thing at the time. Let's first get our "low complexity" modem in the air. > LDPC is available for us to use without > patent issues today. Great. Any idea on turbocodes? Are these free of patents? > Thanks > Bruce 73 Kristoff - ON1ARF ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_sfd2d_oct _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
