Matrix Representation of Linear Systems Relationships
WN is an N X N matrix with elements
for k,n = 0, 1, 2,…, N-1.
The inverse matrix W-1 is also of MN x MN
with W2 partitions of size N x N.
The imth partitions of W-1, symbolized as W-1(i,m), is
for i,m = 0, 1, 2,…, M-1.