Wireless channels may be constantly and exponentially correlated (I'm interested about antenna correlation only). Actually what is the difference between these two correlations?
Could you give examples of where you have come across these models?
The fading of wireless channels can be correlated in time, frequency, and/or space, so there many ways to define terms that you refer to.
Please look at the book (Linear Time-Invariant Systems)
by
Schetzen
from
Northeastern Universiy
in
Boston, MA
Thanks Mr. Ziad Sobih . Could you please provide me this book? There is no free version available.
I think you mean by constant model the uncorrelated model. This model is very simple and can be modelled using the rayleigh fading channel. With this model the eigenvalue are constant and all equal. In the exponential correlation model, there is a correlation in matrix and the eigenvalues are not equal. However, since the degrees of correlation decay exponentially it called exponential correlation model.
Marwah Abdulrazzaq Naser thanks. Would you please say which correlation model is better and why?
Of course, if you want more practical channels, then you need to use channel correlation. The are many different channel correlation models. However, exponential correlation model is used quite often in the literature A. S. M. Badrudduza .
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