Patrick,
I can envision how MU-MIMO could increase /efficiency/. I don't
understand how it could double /capacity/.
If a spatial stream has capacity "X", then two spatial streams could
have capacity 2X. If We're sending one stream each to two users, or two
streams to one user, we still only have maximum capacity of 2X.
I see an increase in efficiency because if one of the two users was
connected at a lower data rate, then we're devoting only half the access
point's capacity to that low speed user during that time frame, whereas
in single user MIMO we'd be devoting all of our resources to the low
speed user. With clever scheduling you'd certainly get more out of the
access point with MIMO, possibly even double if you have a wide spread
of high and low speed users....but a 50mbps channel wouldn't become
100mbps channel. Rather, you'd be able to use a higher proportion of the
possible 50mbps.
Unless there's something about MU-MIMO that escapes me (which is
completely possible). Can you explain?
Thanks,
Adam
As I understand it, the SAS will only be required to "try" to keep
those owning two 10 MHz PALs in one census areas contiguous, and even
then will not be required to do so. I think it will be tough to do
carrier agg in 3.55-3.7 GHz given the new rules, even as a PAL
licensee, much less as a GAA user. Further, I'm uncertain of the
technical complexity in getting a base station to be have dynamic
flexibility in frequency assignment in it carrier aggregation feature.
I would suspect such a thing would not be easy to implement -- seems
easy enough in a none aggregating set of spectrum or a fixed set of
aggregated spectrum, but to have multiple carriers, with each set
potentially dynamic AND aggregated? I'm very doubtful.
What would be much better is MU-MIMO. That will still give you the
doubling of capacity, but enables you to do that within the same 10 or
20 MHz channel.
*Patrick Leary*
***M*727.501.3735
<http://mkt2.us/TelrdNet>
*From:*Af [mailto:af-boun...@afmug.com] *On Behalf Of *Mike Hammett
*Sent:* Saturday, April 18, 2015 9:47 AM
*To:* af@afmug.com
*Subject:* Re: [AFMUG] FCC 3.5 GHZ and Cambium 450
I don't see why you couldn't have 20 MHz.
There haven't been technical enough rules put out to know if you can
do ABAB. I'm guessing not as the SAS will tell you what frequency to
use, but maybe they'll be able to support common systems.
-----
Mike Hammett
Intelligent Computing Solutions
http://www.ics-il.com
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------------------------------------------------------------------------
*From: *"Matt" <matt.mailingli...@gmail.com>
*To: *af@afmug.com
*Sent: *Saturday, April 18, 2015 7:42:36 AM
*Subject: *[AFMUG] FCC 3.5 GHZ and Cambium 450
Has anyone heard how the Cambium 450 gear will work with the new
3.5Ghz FCC rules and additional spectrum? Will he still have 20Mhz
channels and ABAB capability? How will this all work?
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