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Correlation Coefficient for OFDM subcarriers

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James Crawford

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Could someone explain to me or direct me to a source which explains how to find the correlation coefficient at each subcarrier in a multicarrier system, such as OFDM?
I know that the channel correlation matrix R_HH can be found by:

R_HH = E{H.H^T}

where H is the channel matrix and ^T is the matrix transpose. I presume that the channel matrix is in the frequency domain i.e. H_F=h(1),....,h(N), where N is the number of subcarriers.
 

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