It is very common in research works that people consider only one channel coefficient for all of antennas when they analyse the characteristics of AoA estimation in MIMO systems. On the other hand, it is also very common that in Massive MIMO system analysis to consider i.i.d fading for all antennas, independently. Why people do not consider it? If I do that and calculate bounds, is it valid? Because I think considering different fading for antennas (especially in Massive MIMO systems) is logical as some antennas may have considerable amount of distance from each other.
Dear Masoud,
In order to answer this question one has to elaborate the MIMO system model. That is how the antennas are arranged in the space. If they arranged in arrays such that every array builds one beam then they will differ only in phase while the magnitude of the transmission coefficient is consatnt.
If the path of an antenna is different then it will have a unique transport coefficient of its channel.
In summary the transmission coefficients of the paths depends on your physical model.
Best wishes
Dear Masoud,
In order to answer this question one has to elaborate the MIMO system model. That is how the antennas are arranged in the space. If they arranged in arrays such that every array builds one beam then they will differ only in phase while the magnitude of the transmission coefficient is consatnt.
If the path of an antenna is different then it will have a unique transport coefficient of its channel.
In summary the transmission coefficients of the paths depends on your physical model.
Best wishes
Abdelhalim abdelnaby Zekry
Hi Prof. Zekry,
Thank you very much for your answer.
The strange thing for me is that people always consider one fading coefficient for all of antennas in AoA works, however it is very common to consider an i.i.d. channel coefficient for each antenna in Massive MIMO research works. This made me a bit confused.
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