First Certification: 3x3:3
By now, you’re likely well informed about the 802.11n-associated lingo related to MIMO, but if you’re not, here’s a quick tutorial before I get to the point of the article. When referring to 802.11n devices, companies often use an abbreviation that looks something like this: 2x2, 2x3, or 3x3 (pronounced 2-by-2, etc.). These numbers refer to the number of transmit (Tx) and receive (Rx) radio chains, respectively, that are part of the MIMO hardware design. The first number (the ‘2’ in 2x3, for example) is the number of transmit chains. The second number (the ‘3’ in 2x3, for example), as you’ve probably already deduced, is the number of receive radio chains. If you remember from 802.11a/b/g SISO systems, there is only one transceiver with one transmit and receive radio.
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