When a single spatial stream terminal accesses a multi-spatial stream AP, there is MIHO gain, the dual spatial stream gain is 3 dB, and the triple spatial stream gain is 6 dB.

Question

Options

• ATrue
• BFalse

• A
  19% (8)
• B
  81% (35)

Explanation

B is correct because the stated gain values are inaccurate: when a single-stream device connects to a multi-antenna AP, the receive diversity (MRC) gain follows a logarithmic scale - specifically 10 × log₁₀(N) dB, where N is the number of spatial streams/antennas. For dual spatial streams this yields ~3.01 dB (correct as stated), but for triple spatial streams it yields ~4.77 dB, not 6 dB as the statement claims. The 6 dB figure actually corresponds to four antennas (10 × log₁₀(4) ≈ 6.02 dB), making the triple-stream value wrong and the overall statement false. Option A is wrong because it accepts the 6 dB triple-stream claim uncritically.

Memory tip: Think "doubling equals +3 dB" - but the doubling is of antenna count, not stream count in sequence. Going from 1→2 streams gives +3 dB, but going from 2→3 is not another doubling, so you don't get another +3 dB. You need to reach 4 streams (a true doubling of 2) to gain the next 3 dB increment.

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