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It has recently been demonstrated that zero correlation of a random multiple-input multiple-output channel is not a guarantee of its high capacity. Degenerate channels exist, which have zero correlation and still low capacity. In this letter, we provide a statistical analysis of this phenomenon, formulate the general condition for a channel to be degenerate, and propose a method to estimate its capacity. Index Terms-Channel capacity, correlation, keyhole, multipleinput multiple-output (MIMO).doi:10.1109/tcomm.2002.806543 fatcat:uase44vep5bdvaic2juvsyamka