What Is MIMO?

At today's Kindle Fire HD revealing, Jeff Bezos bragged that the Fire HD will be capable of downloading content up to 40 per cent faster than either the iPad or the Nexus 7. Neat trick, but how will it pull it off?

With a little something called MIMO.

MIMO is a data transfer accelerant...

Multiple Input/Multiple Output (MIMO) is the same technology that makes 4G and 802.11n so speedy. It could also be called More That One Antenna In and Out. Most simply put, it increases the number of antennas at the transmitter and receiver. They work in concert to improve the device's performance by transferring more data without requiring added bandwidth or drawing additional power.

A MIMO-enabled device does this by spreading the existing transmission power over multiple antennas, creating an array gain that can either transmit more bits per cycle than a SISO (single input/single output) antenna.

...that also improves connection quality...

Essentially, a MIMO system widens the broadcast "pipeline", allowing more data to flow through at a time. Wi-fi routers have used this technology for years to streamline connections at home.

...without needing a faster processor to make it happen.

In fact, it's a good way to make a device work faster at a lower price — adding an antenna is a relatively cheap parts upgrade compared to other components.

After a 2005 integration into the burgeoning 802.11n standard, MIMO can be found today in 4G, 3GPP Long Term Evolution, WiMAX and HSPA+ systems. As Amazon noted today, it's not in the iPad or Nexus 7. But you'll find it soon enough in the Kindle Fire HD.



    I thought that mimo would be a given for tablets.

    Ahhhh.... rushes back MIMO State-Space equations...... Control Theory anyone???

    This article makes no sense.
    1) Adding an antenna is not cheap. The biggest cost is the extra space required and the expensive RF electronics that go into implementing the second antenna, RF power amps are not cheap...
    2) Where do you connect this second antenna to? It has to go to another port on the microcontroller, which requires more processing power... Handling raw streams of data uses a lot of processing power.
    3) Stick to what you know, instead of glueing information you got off wikipedia together and hoping it makes a legible article...

      I think you just dissedJeff Bezos!

      BTW. Given what you said about the Mimo tech... how come Jeff Bezos has no problem with it on a Kindle?

      You're making no sense to me...

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