Question: Consider a typical Multiple-Input and Multiple-Output antenna system. Among 4 transmit antennas and 5 receive antennas, how many possible independent channels are there? (Assume that

Consider a typical Multiple-Input and Multiple-Output antenna system. Among 4 transmit antennas and 5 receive antennas, how many possible independent channels are there? (Assume that an independent channel is formed by a pair of one transmit antenna and one receive antenna.) Group of answer choices 4 20 5 9

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