802.11n Facts Continued

If you missed the first two facts in this 5 day post about 802.11n, don’t forget to check them out.  Today you get facts #3 and #4…

Fact #3

802.11n can provide higher throughput because it relies on MIMO (Multiple Input, Multiple Output).  MIMO takes advantage of multipath and sends multiple signals at the same time.  This reduces interference and dropouts while also reaching data rates of 600 mbps.  This is possible because MIMO can use multiple transmitters and each spatial stream has the ability to carry its own information.

Fact #4

To get the most bandwidth possible you’ll want to be sure you’re using the right antenna configuration.   802.11n defines a few different combinations for the number of transmitters and numbers of receivers.  For example 2×1 means two transmitters and one receiver, which is the same as transmit beamforming like the picture below from Cisco.  This combination would be a consideration for the more budget conscious users.

802.11n also offers configurations for users that require significant bandwidth.  For the time being 4×4, four transmitters and four receivers, is the combination that will provide for these users.  But it is said that 802.11n will have more options over time.  You just need to remember, the fewer transmitters and receivers, the less bandwidth.

Keep reading for facts #5 and #6 tomorrow