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In MIMO, which factor has the greatest influence on data rates?

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In MIMO, which factor has the greatest influence on data rates?

(a) The size of antenna

(b) The height of the antenna

(c) The number of transmit antennas

(d) The area of receive antennas

I have been asked this question during an online interview.

Question is from Multiple Input Multiple Output (MIMO) topic in portion 4G of Wireless/Mobile

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Correct option is (c) The number of transmit antennas

To explain: By increasing the number of receiving and transmitting antennas, it is possible to linearly increase the throughput of the channel with every pair of antennas added to the system.

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