The antenna configuration of MIMO is usually expressed as "M*N", what M and N are represent? (Multiple choice)

Question

Options

• AM indicates the number of transmitting antennas
• BN represents the number of transmit antennas
• CN represents the number of receiving antennas
• DM indicates the number of receiving antennas

• A
  79% (19)
• B
  13% (3)
• D
  8% (2)

Explanation

In MIMO (Multiple-Input Multiple-Output) notation, M×N follows a transmitter-first, receiver-second convention: M is the number of transmitting antennas and N is the number of receiving antennas. Options A and C correctly capture this - A correctly assigns M to transmit, and C correctly assigns N to receive.

Why B and D are wrong: B incorrectly claims N represents transmit antennas (N is receive), and D incorrectly claims M represents receive antennas (M is transmit). Both options swap the roles of M and N, which are the two most common mistakes on this topic.

Memory tip: Think alphabetically - M comes before N, just as the transmitter comes before the receiver in a signal path. "M sends, N receives."

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