Actually...CDMA techniques (PN modulation) re-channel a band based on time rather than frequency. In a multi point environment, this allows multiple people to share a frequency bandwidth in a not terribly inefficient way when all of the simultaneous communication paths are considered.
On Sat, Oct 25, 2014 at 12:44 PM, Chuck McCown via Af <[email protected]> wrote: > Yeah, isochronous pseudorandom noise mod/demod techniques will pull > info from sewer. I think the deep space network uses some of those > techniques. But PN modulation does not help throughput. It wastes > bandwidth. > > Speed/interference immunity/narrow channels – pick one. > > *From:* Bill Prince via Af <[email protected]> > *Sent:* Saturday, October 25, 2014 11:27 AM > *To:* [email protected] > *Subject:* Re: [AFMUG] Holy Grail > > The holy grail would be the ability to modulate a signal and receive it > correctly in the face of withering interference. > > The GPS system accomplishes that through the technique of encoding the > data within "pseudo noise". The only problem being that GPS data is > relatively static compared to what we deal with. > > > bp > > On 10/25/2014 10:15 AM, Chuck McCown via Af wrote: > > I think folks without deep experience in either 1) operating a WISP or > 2)without deep experience in electrodynamics and modulation (99.999% of the > general population) somehow think that Moore’s Law applies to wireless. > > The only way to scale this this stuff in a way approximating Moore’s Law > is to just keep adding cell/ap sites. > > I read a book back in 1990 that outlined this problem for the nascent cell > phone industry. The book is still spot on. > > *From:* Rory Conaway via Af <[email protected]> > *Sent:* Friday, October 24, 2014 11:41 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] Holy Grail > > > Or looky, looky, AC PTMP MU-MIMO. Imagine what that would do for White > Space. > > > > Rory > > > > *From:* Af [mailto:[email protected] <[email protected]>] *On > Behalf Of *That One Guy via Af > *Sent:* Friday, October 24, 2014 10:22 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] Holy Grail > > > > Sterling, thank you! I think you and me must be the only ones who can see > the elephant...... OH LOOKY LOOKY AC PTMP!! > > > > On Fri, Oct 24, 2014 at 9:09 PM, Sterling Jacobson via Af <[email protected]> > wrote: > > Is it just me, or is no one realizing that we are still not that far from > 2005 with wireless. > > > > Yes, we have 300-1Gbps capable radios. > > But they trade that for larger channel allocations and even more signal to > noise requirements. > > > > But the spectrum allocations haven’t changed enough to use these new > features to their fullest in a radio dense environment. > > > > When doing cost analysis in my area last year for wireless I realized I > had to forklift upgrade most of my network, and build towers out in a half > mile range. > > > > This was to get the 30Mbps plan rates to really work. > > > > The costs were skyrocketing because of all the towers and sectors. > > > > I think the real winners of late are still the rural and low density > wireless provider domains. > > They are the ones with clean enough spectrum to cost this competitively. > > > > > > > > *From:* Af [mailto:[email protected]] *On Behalf Of *Jaime Solorza via > Af > *Sent:* Friday, October 24, 2014 6:41 PM > *To:* Animal Farm > *Subject:* Re: [AFMUG] Holy Grail > > > > Bring out the Holy Grenade of Antioch... > > Jaime Solorza > > On Oct 24, 2014 5:56 PM, "Jayson Baker via Af" <[email protected]> wrote: > > Anyone else get this email? > > > > Anyone know what it is? > > > > > > -- > > All parts should go together without forcing. You must remember that the > parts you are reassembling were disassembled by you. Therefore, if you > can't get them together again, there must be a reason. By all means, do not > use a hammer. -- IBM maintenance manual, 1925 > > >
