Talk:Code-division multiple access: Difference between revisions

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== Commercial Aspects of GSM vs CDMA? ==

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It is an obvious mistake. They meant 0.3 cubic meters. But this is not the main thing. Isn't it funny that the entire history of CDMA consists of only the Soviet history and in the times when USSR didn't have near the technology to make it. And nothing is mentioned about USA usage of it in 70s, 80s and 90s for military and cellular services. This is obviously an example of Russian attempt to claim that everything was invented there. I was born in USSR in 1950s and lived there till 90s and I know what I am saying. Their pride is hurting because Russia is decades behind the West and they found a way to spread propaganda about their successes. Really funny. <small><span class="autosigned">—&nbsp;Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[User:12.216.208.194|12.216.208.194]] ([[User talk:12.216.208.194|talk]] • [[Special:Contributions/12.216.208.194|contribs]]) 20:29, 8 May 2014‎ (UTC</span></small><!-- Template:Unsigned -->

:I have added the reference to the Kupriyanovich 1957 patent to the article. Can somebody check whether it really describes a mobile phone system using what we call CDMA? I find it rather incredible. While it can be possible that the first work about code-division multiple access principle was published in 1935 by Dmitry Ageev, and that Leonid Kupriyanovich in 1957 made a working prototype of a wireless device allowing to make phone calls, and perhaps that spread-spectrum technology was used in USSR since 1970s, it is hardly true that the 1957 Leonid Kupriyanovich's device used CDMA. There was not electronic component base in 1950s to produce a device with weight of 3 kg with CDMA technology in the eastern block, and there is no reason why even the first prototype should use CDMA. I've spent some time with the text, so I can supply the corrected text of the patent in Russian language. The patent describes the device build from vacuum tubes. [[User:Kolarp|Kolarp]] ([[User talk:Kolarp|talk]]) 21:27, 9 July 2020 (UTC)

== Please explain the coding step in the example: ==

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Thanks! <!-- Template:Unsigned IP --><small class="autosigned">—&nbsp;Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/70.163.0.234|70.163.0.234]] ([[User talk:70.163.0.234|talk]]) 13:13, 12 August 2016 (UTC)</small> <!--Autosigned by SineBot-->

== External links modified ==

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I have just modified one external link on [[Code-division multiple access]]. Please take a moment to review [https://en.wikipedia.org/w/index.php?diff=prev&oldid=794804120 my edit]. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit [[User:Cyberpower678/FaQs#InternetArchiveBot|this simple FaQ]] for additional information. I made the following changes:

*Added archive https://web.archive.org/web/20110208014615/http://www.cdg.org/ to http://www.cdg.org/

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:It's not clear why the archived version is necessary; why is the status of the site from 2011-02-08 of more interest than the status of the site from any other day, including today? [[User:Guy Harris|Guy Harris]] ([[User talk:Guy Harris|talk]]) 07:30, 10 August 2017 (UTC)

== Barker Codes ==

In this article we have, "Due to their very advantageous auto- and crosscorrelation characteristics, these spreading sequences have also been used for radar applications for many decades, where they are called Barker codes (with a very short sequence length of typically 8 to 32)."

The text "length of typically 8 to 32" is misleading. Listed in the Barker code article, "Only nine Barker sequences are known, all of length N at most 13." <!-- Template:Unsigned --><span class="autosigned" style="font-size:85%;">—&nbsp;Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[User:Rwg1975|Rwg1975]] ([[User talk:Rwg1975#top|talk]] • [[Special:Contributions/Rwg1975|contribs]]) 13:56, 30 January 2022 (UTC)</span> <!--Autosigned by SineBot-->

== Spread-spectrum multiple access ==

Is ''spread-spectrum multiple access'' a synonym for ''code-division multiple access''? (see [[Talk:Channel_access_method#Code_division_multiple_access_(CDMA)/Spread_spectrum_multiple_access_(SSMA)]]) ~[[User:Kvng|Kvng]] ([[User talk:Kvng|talk]]) 17:53, 5 June 2022 (UTC)