MU-MIMO channel bandwidth

[Anwar Safian]

Hi expert

What I know, if 4x4:4 AP, it will use 4 spatial stream to send data to 4 client simultaneously. 

Is each stream use same channel bandwidth?

[Leo Laohoo]

Yes.  Same channel from each radio sent via different "angles".

[Anwar Safian]

Hi Leo

What do you mean by "difference angle"?

How this can avoid the interference between 4 spatial stream?

Assume that 4 wireless clients is sitting near beside each other. 

[Leo Laohoo]

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@Anwar Safian wrote:

What do you mean by "difference angle"?

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One radio, FOUR ANTENNAS.  Each antenna transmits data to a single wireless client at different intervals.  The data "flies" at different angles and bounces before ONE reaches the client.  The other three packets "expires".

Rinse, repeat.  

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@Anwar Safian wrote:

How this can avoid the interference between 4 spatial stream?

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Co-Channel Interference only happens when you hear two (or more) radios operating one single channel.  SS is different.  Single radio, multiple antennas.  As far as the wireless client "hears", it is only one radio.