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In the paper, is discussed a MIMO-OFDM system over the frequency self-correlation of i.i.d. Rayleigh channels and subcarrier grouping. in this paper is shown the following figure. enter image description here

it shows the self-correlations of different fading environments.

Questions:

  1. It is shown autocorrelation function in this figure, isnt?
  2. What conlusion can I do accroding to this figure?
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