Greetings, the maximum value of diversity gain for MIMO antenna is fixed at 10dB. What is so special about that value? What does DG 10dB mean.
Greetings professor, in a research paper professor. Professor apart from this I have also come across papers stating "finally we have come up with mimo antenna design to value closer to the maximum DG value of 10dB". Professor kindly help in identifying the misuse of DG parameter from the written statement. Thanks in advance professor.
For a given number of antennas, there is a maximum diversity gain that one can achieve according to the underlying theory. I guess the authors of the paper compare their measurements with the theoretic limit.
Since they said 10 dB, I would guess that they considered an array with 10 antennas. If there were 20 antennas, the maximum would then instead be 13 dB.
There are some different ways to measure the diversity gain, so I cannot tell precisely what they had in mind in this work.
I have gone through some of the literature after reading the question. What I understand is:
It is related to number of antennas and the term Envelope Correlation Coefficient (ECC). There is formula mentioned:
Diversity Gain = 10*(1-ECC^2)^(1/2) dB
so max gain is 10 dB as ECC approaches to 0.
I agree with Prof. Emil Björnson that it depends on fixed number of antennas and how they are placed (value of ECC) to become a MIMO antenna.
Means if you are a making MIMO antenna with 4 antennas than you have to compare with other MIMO antenna with 4 antennas only.
This is what i understand. Hope Prof. Emil Björnson will give us more enlightened answer.
Regards
Ashish
Thanks prof. Ashish, I do agree to all the statements, but prof. literatures with more than 2 radiator elements also reported 10 dB as the maximum DG which is disturbing the criteria of DG dependence on number of radiator elements.
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