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MIMO

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802.11a/g[edit]

Proprietary MIMO technology can be found in some Wireless-G devices. However, both the access point and the adapter must support the same technology. These proprietary MIMO modes are not standardized between vendors..

Most high throughput modes (including some branded as MIMO) do not use MIMO tech.

Proprietary vendor specific MIMO modes, by manufacturer[edit]

Airgo True MIMO (Gen1, AGN100) - max. PHY rate of 108Mbps (2x2/2x3), two spatial streams

  • Linksys SRX
  • Belkin Pre-N
7 client adapters using AGN1xx, 6
Empty strings are not accepted.
embedded systems using AGN1xx

Airgo True MIMO (Gen3, AGN300) - max. PHY rate of 240Mbps (2x2/2x3) [1], two spatial streams, channel bonding

  • Linksys SRX400
  • Netgear RangeMax 240
14 client adapters using AGN3xx, 6
Empty strings are not accepted.
embedded systems using AGN3xx

Atheros VLocity (AR5513) - 108Mbps (two Tx/Rx chains, single spatial stream [not really 'True' MIMO], channel bonding [Super G / Super AG])

11 client adapters using AR5513, 4
Empty strings are not accepted.
embedded systems using AR5513

Additional (non-MIMO) proprietary vendor specific modes, by manufacturer[edit]

Atheros Super G / Super AG - 108Mbps max. signalling rate (w/ channel bonding)
Super G (wireless networking) on Wikipedia

Broadcom Afterburner (125HSM) - 125Mbps theoretical max. signalling rate
125 High Speed Mode on Wikipedia

  • Linksys SpeedBooster

Ralink MIMO XR - 108Mbps (while branded MIMO, RT2661 only supports multiple receive chains..)

  • Linksys RangeBooster
  • Belkin Wireless G Plus MIMO
36 client adapters using RT2661, 18
Empty strings are not accepted.
embedded systems using RT2661

Intersil Nitro - claimed ~140Mbps throughput (per Wikipedia)
Nitro (wireless networking) on Wikipedia

802.11n[edit]

MIMO is a part of the 802.11n specification. Different notations may be used to describe the MIMO capabilities of a given device.

TxR:S
T: Number of transmit radio chains
R: Number of receive radio chains
S: Number of spatial data streams

1x1:1 - 150Mbps transmitting and receiving
1x2:2 - 150Mbps transmitting, 300Mbps receiving
2x2:2 - 300Mbps transmitting and receiving
2x3:2 - 300Mbps transmitting and receiving
3x3:2 - 300Mbps transmitting and receiving
3x3:3 - 450Mbps transmitting and receiving

May also be described as xTyR where x is the number of transmit radio chains and y is the number of receive radio chains. This notation neglects the number of spatial data streams.
1T1R SISO: 150Mbps transmitting and receiving (single input single output)
1T2R MISO - 150Mbps transmitting, 300Mbps receiving (multiple input single output)
2T2R MIMO - 300Mbps transmitting and receiving (multiple input multiple output)
2T3R MIMO - Usually 300Mbps transmitting and receiving (multiple input multiple output)
3T3R MIMO - 300Mbps or 450Mbps transmitting and receiving depending on the number of spatial streams (multiple input multiple output)

What is a "Stream" anyway? (how 802.11n works)