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mimo vs phased array

 
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nurul
Antenna Theory Regular


Joined: 26 Apr 2011
Posts: 23

PostPosted: Tue Nov 29, 2011 5:31 pm    Post subject: mimo vs phased array Reply with quote

hello,

from what i understand, MIMO (as the name says) stand for multiple input and multiple output system where as phased array system involves at least an array of 2 elements that resulting to a one output system.
mimo system also requires more than one antenna, and since these antennas can operate simultaneously, wouldn't the resulting beam of this mimo system be as the resulting of the phased array? (say if both the MIMO and phased array has the same array configuration).

what is the difference between the resulting radiation pattern between phased array and MIMO system?
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Schubert
Antenna Wizard


Joined: 08 Apr 2009
Posts: 161

PostPosted: Tue Nov 29, 2011 6:21 pm    Post subject: Reply with quote

So, yes, phased arrays have antennas all transmitting the same signal (possibly delayed or scaled). MIMO typically transmits multiple information streams, or uses switched diversity to improve reception.

So you don't really talk about the radiation pattern for a MIMO system. MIMO systems can use antennas with different radiation patterns or different polarizations, whereas phased arrays typically don't do that. If you have distinct antennas (facing different directions, or with different patterns or polarizations), it greatly helps to separate the two streams. This can then provide you unique paths to transmit more information.

I hope this helps
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wolberine
Antenna Theory Regular


Joined: 01 Mar 2011
Posts: 35

PostPosted: Fri Dec 02, 2011 1:41 pm    Post subject: Reply with quote

So is the take away that...

MIMO systems can be thought of as multiple receivers, with one antenna each, receiving separate bit streams to improve the overall data rate

Whereas...

Phased arrays would help to control the direction of the antenna beam (for whatever purpose)?
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nurul
Antenna Theory Regular


Joined: 26 Apr 2011
Posts: 23

PostPosted: Fri Dec 02, 2011 1:45 pm    Post subject: Reply with quote

thank you very much for the replies Very Happy .
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Bobby Digital
Antenna-Theory.com Newbie


Joined: 14 Jan 2011
Posts: 8

PostPosted: Wed Dec 07, 2011 1:08 am    Post subject: Reply with quote

wolberine wrote:
So is the take away that...

MIMO systems can be thought of as multiple receivers, with one antenna each, receiving separate bit streams to improve the overall data rate

Whereas...

Phased arrays would help to control the direction of the antenna beam (for whatever purpose)?


correct
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