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Wireless Access Point

46 Installing the Wireless AP

one is directed to a mobile phone. When a transmission is complete, the antennas

are reallocated.

Figure 20. MU-MIMO with Four Antennas

The table below illustrates how data streams might be allocated to multiple users

on an 802.11ac transmitter with multiple antennas.

# of AP Antennas Possible Combinations of Receiver Antennas

2 1 station w/ 2 antennas -or- 

2 stations w/ 1 antenna

3 1 station w/ 3 antennas -or-

1 station w/ 2 antennas + 1 station w/ 1 antenna -or-

3 stations w/ 1 antenna

4 1 station w/4 antennas -or- 

2 stations w/2 antennas -or-

1 station w/2 antennas + 2 stations w/1 antenna -or- 

4 stations w/ 1 antenna

8 1 station w/ 8 antennas -or- 

2 stations w/ 4 antennas -or-

1 station w/ 4 antennas + 2 stations w/ 2 antennas -or-

2 stations w/ 2 antennas + 4 stations w/1 antenna -or-

… many other combinations …

Spatial Streams

Rx 1

Rx 3

Data Stream

Tx 1

Tx 3

Rx 2Tx 2

Tx 4

Transmitter

(Access

Point)

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