where p = 1, 2, 3, ··· , + ∞. Note that for any chain that is longer than S, H willalways be a “fat” matrix, which means for each antenna configuration, there existmultiple chains with length equal to S, S + 1, ···.The chains with the length of S are referred to as the original alignment chains.It can be seen there are three original chains. Each chain originates from onetransmitter, i.e., j = 1, 2, 3. The three original chains can be expressed as follows
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