Do you have a reference I could look at Daniel? On Wed, 2013-03-06 at 09:23 -0800, Daniel Mundall wrote: > David, > Speaking of the PAPR issues, I came across Walsh Hadamard Transform > which some research claims can get as much as 5 to 10db and the > ability to use a Class C PA. > Do you think something like that could help? > Daniel Mundall > > > On Tue, Mar 5, 2013 at 8:42 PM, David Rowe <[email protected]> wrote: > Hi Daniel, > > Yes I have wondered if a separate rx with separate antenna > might help > get around fades. I imagine there needs to be a certain > separation > (certain number of wavelengths) between the antennas. > > Some other ways to get that 6dB are coding gain (if FEC can be > made to > work better) and lower Codec bit rates (if that doesn't make > the > robustness worse). At the tx end higher average power > (reducing PAPR > issues) would also help the link budget. > > Thanks, > > David > > On Tue, 2013-03-05 at 20:30 -0800, Daniel Mundall wrote: > > David, > > Amazing to see all the work that has gone into getting it > where it is. > > Thinking about that 6db you are looking for, wouldn't it be > possible > > to get that at some point with something like SoftRock with > dual tx-rx > > chains (MIMO)? It may not be practical for the lower > bands(antenna > > size), but when possible it may be one of the easiest ways > to get that > > link budget and possibly even lower the tx power. > > I found some of the ideas here interesting > > http://www.sequans.com/pdf/SequansUplinkMIMOWP0608_v2.pdf > > It may not something for right now, but it looks like > something with > > potential for the future. > > 73s > > Daniel > > > > > > Sent from Daniel's iPhone > > > > On Mar 5, 2013, at 12:09 PM, David Rowe <[email protected]> > wrote: > > > > > > > Hello, > > > > > > I have just published a new blog post on making FreeDV > robust over > > > HF > > > multipath channels: > > > > > > http://www.rowetel.com/blog/?p=2905 > > > > > > Thanks, > > > > > > David > > > > > > > > > > > > > > ------------------------------------------------------------------------------ > > > 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_d2d_feb > > > _______________________________________________ > > > Freetel-codec2 mailing list > > > [email protected] > > > > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > > > > > > ------------------------------------------------------------------------------ > > Symantec Endpoint Protection 12 positioned as A LEADER in > The Forrester > > Wave(TM): Endpoint Security, Q1 2013 and "remains a good > choice" in the > > endpoint security space. For insight on selecting the right > partner to > > tackle endpoint security challenges, access the full report. > > http://p.sf.net/sfu/symantec-dev2dev > > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > > > > ------------------------------------------------------------------------------ > Symantec Endpoint Protection 12 positioned as A LEADER in The > Forrester > Wave(TM): Endpoint Security, Q1 2013 and "remains a good > choice" in the > endpoint security space. For insight on selecting the right > partner to > tackle endpoint security challenges, access the full report. > http://p.sf.net/sfu/symantec-dev2dev > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > > ------------------------------------------------------------------------------ > Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester > Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the > endpoint security space. For insight on selecting the right partner to > tackle endpoint security challenges, access the full report. > http://p.sf.net/sfu/symantec-dev2dev > _______________________________________________ Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2
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