Talk:MIMO

message: MIMO has at least two meanings in Electrical Engineering: MIMO Control and MIMO Communications. Avoiding ambiguity is much more important than avoiding the abreviations. This page is about MIMO Communications and the current title is a wrong title for it. The title should be MIMO Communications orMultiple-Antenna Communications.   Bidabadi 00:34, 7 March 2006 (UTC)
replies: text: Call it something like Multiple-input multiple-output (communications) instead, then. This is more in keeping with how we usually name such articles. You'll also need to make Multiple-input multiple-output (disambiguation) and link there to the two articles you referenced on my talk page. Do they both exist? -Splashtalk 00:41, 7 March 2006 (UTC)
thread_title: Title

message: 250Mbit real troughput is more than 10 times higher than classic 802.11g with its real 25Mbit. For SuperG (40MBit) it is more than 6 times higher. And, speaking of Atheros past expectations for SuperG technology (up to 70MBit theoretical maximum, unapproved) it is just about 3.5 times higher. 802.11 article says the expected maximum is 540Mbit, while manufacturers state it's 650Mbit or 12x speed of 802.11g (in wich they mean higher than 10 times of real 802.11g, and wich is definitely not true as we've seen in previous standard's evolution). That statement definitely needs more approval or is arguable.  --GrAndrew 06:39, 4 June 2006 (UTC)
thread_title:  250Mbit real troughput is more than 10 times higher 

message: I removed alot of 802.11n discussions since MIMO is much more than just 802.11n. I also statrted to edit the encoding of MIMO where a general approach was taken with linear precoding. We can continue to add decoding algorithms and different precoders etc
:You did put it somewhere else, right? It doens't need to removed the encyclopedia wholesale. -Splash - tk 15:19, 14 June 2006 (UTC)
thread_title:  Removing some of the  802.11n stuff 

message: Do anybody have a reference which actuallu uses these classifications (2.0/3.0)? I have never heard of them before. Mossig 18:47, 22 September 2007 (UTC)
replies: text: In my view this makes it OR and thus not fit to be included in Wikipedia. When (and if) the terms starts to be commonly used it can be reinserted. Mossig 08:28, 23 September 2007 (UTC)
replies: text: Ok, I agree to remove the subsection of MIMO 2.0/3.0 since it is not yet common terminology. However, as it was noted before, why don't we add it inside contents which describes the future MIMO techniques.JSK 12:23, 23 September 2007 (UTC)
thread_title:  MIMO 2.0/3.0 

message: I am not aware of this terminology. Please justify this with citations to academic literature, or it will have to be removed. I have looked on Google and on IEEEXplore and cannot find any references to it, interesting as it is. Splash - tk 23:13, 26 September 2007 (UTC)
thread_title:  MAIMO and variants to be removed 

message: The illustration on the top right is confusing, or more correctly - confused.
Where it says SIMO, it is in fact MISO, and where it says MISO it is SIMO!
: The terminology refers to the radio channel, and thus the figure is correct as it is.Mossig 18:51, 9 November 2007 (UTC)
replies: text: The problem with the picture is that it doesn't indicate what the "system" is.  A block needs to be drawn encompassing the transmit antennas, the receive antennas, and the space between, but not the devices.  This is needed because if the "system" is viewed in subsections, where subsection 1 is just the transmit device and its respective antennas and subsection 2 is just the receive device and its respective antennas, then the MISO and SIMO cases would be incorrectly termed, as multiplexing/demultiplexing occurs at the respective transmitter/receiver accordingly. This stems from the fact that MISO, SIMO, SISO, and MIMO can refer to any system.  Mojodaddy (talk) 21:34, 6 November 2008 (UTC)
replies: text: Almost correct: the antennas are commonly not part of the "system", SISO etc. refers to only the channel. Mossig (talk) 18:19, 10 March 2009 (UTC)
replies: text: So we should draw the box around the radio channel and write SISO, SIMO, etc. inside the box. It is still confusing as confirmed by the comments further down on this talk page.  —Preceding unsigned comment added by 69.38.192.210 (talk) 15:43, 9 December 2010 (UTC)

text: The text about SIMO etc. is correct in the article, and in correspondance with the picture. Mossig (talk) 18:19, 10 March 2009 (UTC)
replies: text: The current illustration is not very helpful. It merely depicts the schematic differences between MISO, SIMO, SISO, and MIMO (which is obvious and not very informative). The reason that MIMO is an important part of advanced wireless standards is that it exploits multipath propagation to send multiple signals and, consequently, multiply capacity. What's needed is a diagram that illustrates that. A few more diagrams could be added to the article to illustrate multi-user MIMO, massive MIMO, and cooperative MIMO.Claudeb (talk) 23:08, 21 January 2015 (UTC)
thread_title:  Illustration confusing 

message: I confirm diagram do not match names. SIMO and MISO diagrams are inverted.  —Preceding unsigned comment added by Alexandre.2.beaudry (talk • contribs) 14:36, 9 March 2009 (UTC)
replies: text: No, see text above. Mossig (talk) 18:20, 10 March 2009 (UTC)

text: The superscript "H" denotes Hermitian transpose, that is transpose and complex conjugation. I have clarified this in the text.  —Preceding unsigned comment added by 89.160.7.172 (talk) 20:04, 23 May 2010 (UTC)
thread_title:  Illustration confusing  confirmed

message: This article really needs help from native English speakers. The content might or might not be good, but the language is super-clunky (it falls below the credibility threshold).
"Up to now,[when?]  multi-antenna MIMO (or Single user MIMO) technology has been mainly developed and is implemented in some standards, e.g. 802.11n products."
"Recently, the research on multi-user MIMO technology has been emerging."
"Spatial multiplexing techniques makes the receivers very complex"
"a transmitter sends multiple streams by [using? through?] multiple transmit antennas"  —Preceding unsigned comment added by 204.15.64.155 (talk) 23:25, 15 September 2010 (UTC)
thread_title:  Language needs work 

message: An image used in this article, , has been nominated for speedy deletion at Wikimedia Commons for the following reason: Copyright violations 
;What should I do?
Don't panic; deletions can take a little longer at Commons than they do on Wikipedia. This gives you an opportunity to contest the deletion (although please review Commons guidelines before doing so). The best way to contest this form of deletion is by posting on the image talk page.
* If the image is non-free then you may need to upload it to Wikipedia (Commons does not allow fair use)
* If the image isn't freely licensed and there is no fair use rationale then it cannot be uploaded or used.
* If the image has already been deleted you may want to try Commons Undeletion Request
To take part in any discussion, or to review a more detailed deletion rationale please visit the relevant 
This is Bot placed notification, another user has nominated/tagged the image --CommonsNotificationBot (talk) 21:35, 10 February 2012 (UTC)
thread_title: File:Ltemimoantenna.jpg Nominated for speedy Deletion

message: The introduction language could be better.  It gets far too technical.  Content is fine, just that as-is it needs an introduction to the introduction.67.167.106.3 (talk) 19:18, 17 April 2013 (UTC)
thread_title:  Introduction could be better 

message: Surely this could be re-written, sticks out like a sore thumb.  — Preceding unsigned comment added by 63.239.86.1 (talk) 01:38, 17 January 2014 (UTC)
thread_title:  "(pronounced my-moh by some and me-moh by others)" 

message: 'MIMO is the use of multiple antennas at both the transmitter and receivers'
Ok.
'Note that the terms input and output refer to the radio channel carrying the signal, not to the devices having antennas'
But you just said that MIMO (an acronym basically consisting of the words input and output) refers to the use of 'multiple antennas', and now it has nothing to do with antennas? Well, you lost me.
I also don't see at all what the picture is supposed to illustrate. Antennas, or what? If so, there sure is a lot of mentions of antennas that (according to this talk page) seems to be pretty irrelevant when talking about the concept of MIMO (whatever it might be).  — Preceding unsigned comment added by 193.13.114.130 (talk) 00:21, 20 February 2014 (UTC)
thread_title:  Intro confusing 

message: As others have noted, this page has major problems. The biggest is that it confuses what I would call "schematic MIMO" with modern MIMO. I changed the Intro to highlight why MIMO has become an essential element of standards beginning with 802.11n. I've started to correct and clarify the History of MIMO section. There are also problems with the page due to poor writing. Claudeb (talk) 17:08, 28 September 2014 (UTC)
replies: text: I've revised the lead to focus the article on MIMO as the term is used today. I'm also revising the history section which is very unclear. The papers from the 1970s explored methods for overcoming mutual interference (crosstalk) in cable bundles. SDMA is a related concept, but the early patents described methods for frequency reuse. This needs to be explained. Papers on beamforming or that were published in 1999 seem out-of-place. Claudeb (talk) 20:56, 21 January 2015 (UTC)
replies: text:  I replaced the diagram at the upper right. The original diagram merely illustrated four possible antenna configurations for a point-to-point link.  The new diagram illustrates how MIMO uses multipath propagation to multiply link capacity. This is the operating principle behind modern MIMO and it was nowhere to be found in the original diagram. I will add another diagram when I get a chance to illustate multi-user MIMO. Claudeb (talk) 16:11, 25 February 2015 (UTC)
thread_title:  Article confused and poorly written 

message: Hello fellow Wikipedians,
I have just modified 3 external links on MIMO. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
*Added archive https://web.archive.org/web/20131207054411/http://www.wimaxforum.org/sites/wimaxforum.org/files/document_library/wimax_802.16m.pdf to http://www.wimaxforum.org/sites/wimaxforum.org/files/document_library/wimax_802.16m.pdf
*Added archive https://web.archive.org/web/20070810052329/http://www.eecs.berkeley.edu/~dtse/book.html to http://www.eecs.berkeley.edu/~dtse/book.html
*Added archive https://web.archive.org/web/20120208121926/http://mars.bell-labs.com/papers/proof/ to http://mars.bell-labs.com/papers/proof/
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
Cheers.—InternetArchiveBot (Report bug) 16:47, 10 January 2018 (UTC)
thread_title:  External links modified 

message: 1. I would like to ask about Frequencies Bands where MiMo is not possible, nor profitable.
2. And I also would like to ask about Frequencies Bands where MiMo is especially possible, easy and profitable.
3. I would like also to ask about how MiMo could prevent some level of Radio jamming and could facilitate Triangulation 4.
(I understand that answer could be negative, but I want to read elaborate answer what would be level (5) of prevention, and what would be level (6) of facilitation).
I would like that answer to these 6 questions would take separate section within article.  — Preceding unsigned comment added by 46.187.193.21 (talk) 18:17, 4 April 2022 (UTC)
thread_title:  Question about Frequencies Bands