Yeahbut, it appears QAM has won? Yes?
LTE doesn’t have much in common with CDMA anymore.
From: Chuck Macenski via Af
Sent: Saturday, October 25, 2014 2:43 PM
To: af@afmug.com
Subject: Re: [AFMUG] Holy Grail
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 <af@afmug.com> 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
Sent: Saturday, October 25, 2014 11:27 AM
To: af@afmug.com
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.
bpOn 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
Sent: Friday, October 24, 2014 11:41 PM
To: af@afmug.com
Subject: Re: [AFMUG] Holy Grail
Or looky, looky, AC PTMP MU-MIMO. Imagine what that would do for White
Space.
Rory
From: Af [mailto:af-boun...@afmug.com] On Behalf Of That One Guy via Af
Sent: Friday, October 24, 2014 10:22 PM
To: af@afmug.com
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 <af@afmug.com>
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:af-boun...@afmug.com] 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" <af@afmug.com> 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
