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For a transmit array consisting of 5 identical antennas, what is the maximum array gain it...

For a transmit array consisting of 5 identical antennas, what is the maximum array gain it can achieve when the transmitter has the channel state information? What happens when the transmitter does not have the channel state information?

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Answer #1

According to concept,


If perfect channel state information is available to the transmitter, Than Maximum Gain is equal to number of
transmit antennas and the number of receivers is achievable.
Since 5 identical Transmitter antennas are given.

Hence for the channel state information Maximum gain is equal
to 5.

On the other hand, if each receiver has identical
fading statistics and the transmitter has no channel information(i.e.Channel State information is not there),
the maximum achievable multiplexing gain is only one.

Hence If transmitter does not have the channel state information, Than maximum achievable gain is one.

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