If an 802.11n AP supports 2*2 MIMO technology, what is the theoretical rate of this AP?

Question

Options

• A150 Mbps
• B300 Mbps
• C450 Mbps
• D600 Mbps

• A
  4% (1)
• B
  79% (19)
• C
  13% (3)
• D
  4% (1)

Explanation

Option B (300 Mbps) is correct because 802.11n achieves a maximum theoretical rate of 150 Mbps per spatial stream, and 2x2 MIMO means two spatial streams transmitting simultaneously, giving 2 x 150 = 300 Mbps total throughput.

Option A (150 Mbps) describes the rate of a single spatial stream, which would apply to a 1x1 MIMO configuration, not 2x2. Option C (450 Mbps) corresponds to 3x3 MIMO (3 streams x 150 Mbps), and Option D (600 Mbps) corresponds to 4x4 MIMO (4 streams x 150 Mbps), which are both valid 802.11n configurations but not what is described here.

Memory tip: Multiply the number of streams (the first digit in the MxM notation) by 150 Mbps to get the theoretical 802.11n rate - so 2x2 = 2 x 150 = 300 Mbps.

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