expeditionradio wrote: > BPL-Busting Modes/Techniques > > >
--- snip ---- > The development of new amateur modes, semi-automated and automated > frequency agile systems, advanced ARQ, and various sorts of FEC > digital techniques are a possible avenue for amateurs to > "communicate through" the interference caused by BPL. It may not be > possible to entirely eliminate all the harmful interference BPL > creates, but we need to start planning for mitigation. We need to > research and characterize the various types of BPL signals so that > we can design modulation and control techniques to compensate for > them. > > I recently had a general manager of a large amateur radio organization tell me that if I made it possible to communicate through BPL or in any way mitigated BPL through DSP techniques, I would begin to sing soprano and the GM did not mean falsetto. > Using radio engineering and specially-designed digital signal > processing, we can develop "BPL-Busting Modes". These new modes > and systems could carry any combination of voice/image/text/data. > Frequency hopping, spread spectrum, wideband OFDM, multi-PSK, ALE, > and MFSK are mode/systems that we could implement immediately in > new formats... > > Unfortunately, hams in USA don't have the freedom within the > USA FCC rules to advance some of these yet. We look to hams in other > countries to pioneer these new techniques. > Any technique that would allow higher rates and near bullet proof performance would necessarily sound a whole lot like noise and would necessarily be fairly wideband and would not work in today's traditional radios but would certainly work in the SDR radios. I am afraid that if I didn't have the general manager alter my singing pitch, the rest of ham radio might. > Under USA FCC current Amateur Radio Service rules, we do not have > the freedom that other countries have, to take advantage of some of > the most useful technologies that could help us to "communicate > through" BPL interference. We are still locked in our technology > prison. Hopefully, in the near future, we will have more freedom... > with bandwidth-based spectrum management. > I say that we can do turbo trellis coded based OFDM that are designed for fading dispersive channels with cochannel interference. One of these years when I have yet another life to give, I am certain I can do it and pound tons of data through. The research in ARQ and the development of ALE should indeed allow us to greatly improve the robustness of our link to effectively use the fancier modulations. > 73 Bonnie KQ6XA > > > > Thank you for starting an interesting thread. 73 Bob N4HY -- AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman "You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat." - Einstein Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
