The simulation tools provides us two diffferent types of gains for patch antenna
those are Gain IEEE and Realized Gain. What is the difference or calculation between them.
Further if go for multiport antenna, we have 3 different types of gain Realize Gain, MEG, and Diversity Gain. How can we explain them with a comparision that what are those 3.
- IEEE Gain: This is the theoretical maximum gain that can be achieved by a MIMO system. It is calculated by assuming that the channel is perfectly known at both the transmitter and receiver, and that there is no noise.
- Realized Gain: This is the actual gain that is achieved by a MIMO system in a real-world environment. It is lower than the IEEE Gain due to factors such as imperfect channel knowledge, noise, and interference.
- Mean Effective Gain: This is the average gain that is achieved by a MIMO system over a large number of channel realizations. It is a more accurate representation of the performance of a MIMO system than the Realized Gain.
- Diversity Gain: This is the gain that is achieved by a MIMO system due to the fact that the signals received from different antennas are uncorrelated. This means that if one signal is lost due to fading, the other signals can still be received.
The following table summarizes the four gains and how they are differentiated:
Murtadha Shukur Murtadha Shukur
Dear Sir, thanks for your reply on the above question.
The MEG is always below -3dB, means that we do not have +ve average gain in a mimo system.
Also the diversity gain is achieved due to signal received from uncorrelated antennas, so that is an achievement or drawback. It always approaches to 10, why?
Can you put some light on these 2 things for my better understanding as per you convenience on time?
Thank you.
Regards
Rahul.
The diversity gain achieved due to signal received from uncorrelated antennas is an achievement, not a drawback. It means that by using multiple antennas, we can improve the reliability of our communication link by reducing the probability that all antennas are in a fade at the same time. This is because the signals received on different antennas will experience different fading, so there is a greater chance that at least one antenna will be able to receive the signalreliably.
The diversity gain approaches 10 as the number of antennas increases. This is because with a large number of antennas, the probability that all antennas are in a fade at the same time becomes very small. In the limit, as the number of antennas approaches infinity, the probability that all antennas are in a fade is zero, and the diversity gain approaches 10.
Here is a table showing the diversity gain for different numbers of antennas:
As you can see, the diversity gain increases rapidly with the number of antennas. This is why antenna diversity is a very effective way to improve the reliability of communication links in a variety of environments.
For another Part you Asked
Sure, I can help you understand these two things in more detail.
- Diversity gain achieved due to signal received from uncorrelated antennas
Diversity gain is the improvement in the reliability of a communication link achieved by using multiple antennas. This is possible because the signals received on different antennas will experience different fading, so there is a greater chance that at least one antenna will be able to receive the signal reliably.
The antennas are said to be uncorrelated if the fading on the different antennas is independent. This means that the fading on one antenna does not affect the fading on the other antennas. In this case, the diversity gain is equal to the number of antennas.
For example, if we have two antennas and one antenna is in a fade, the other antenna will still be able to receive the signal reliably. This is because the fading on the two antennas is independent, so the probability that both antennas are in a fade at the same time is very small.
- Diversity gain always approaches to 10
The diversity gain approaches 10 as the number of antennas increases. This is because with a large number of antennas, the probability that all antennas are in a fade at the same time becomes very small. In the limit, as the number of antennas approaches infinity, the probability that all antennas are in a fade is zero, and the diversity gain approaches 10.
This is because the fading on different antennas is random, and the probability of all antennas being in a fade at the same time is very small. As the number of antennas increases, the probability of all antennas being in a fade at the same time becomes even smaller.
In practice, the diversity gain will never reach 10, but it will get very close as the number of antennas increases.
I hope this helps! Let me know if you have any other questions.
Murtadha Shukur
Thanks for your kind response sir.
MEG shows the gain of antenna system considering its environment.
The MEG is always below -3dB, means that we do not have +ve average gain in a mimo system?
Also, MEG -3dB Shows 100 percent effeciency as per some literatures, is this due to max. power transfer.
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