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4x4 MIMO = 4 spatial streams?

1 posts by 1 authors in: Forums > CWDP & CWAP - Enterprise Wi-Fi Design & Analysis
Last Post: July 8, 2010:
  • By cwnpchina
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    Quantenna announced last month that it's [url=http://www.quantenna.com/pressrelease-06_09_10.html]Full-802.11n 4x4 MIMO chipset[/url] - the world's first full-802.11n solution - has been approved by the Wi-Fi Alliance to be Wi-Fi CERTIFIED n and WMM certified.

    The Quantenna QHS600 uses 4 standard omni-directional antennas. But my question is: [b]Does a 4x4 MIMO system mean it has to be using 4 spatial streams?[/b]

    Some news report I read said the Full-802.11n 4x4 MIMO solution actually uses 2 spatial streams and could get a data rate of up to 300 Mbps.

    Sometimes, in a 4x4 MIMO system, some of the independent streams can be combined together to increase reliability and transmission range. For instance, Stream 1, 2, and 3 can be combined while leaving Stream 4 still independent. In this situation, there are only 2 streams if looking from outside.

    A bit confused...

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