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In a multi-antenna system, we often mention diversity gain in fading channels. I am doing simulations with multiple antenna settings at the receiver considering TDLC channel, for example, 1rx, 2rx, 4rx..

The performance improvement I am seeing in the case of more antenna --> should I call it an array gain or diversity gain?

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As is often the case, the definitions of these concepts are not perfectly agreed on by everyone. This is what I think is the most popular interpretation:

  • Diversity gain is the gain in SNR at the receiver, obtained by taking advantage of any kind of diversity: transmit, receive, frequency, space-time, polarization... etc.

  • Array gain is a specific case of diversity gain, obtained when the receiver has multiple antennas and it manages to coherently add the signals received by each antenna.

So, you can call it a diversity gain in general, or an array gain if you want to be more explicit.

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