Consider the complex regression model (7.28) in the form Y = XB + V , where Y = (Y1, Y2, . . . YL)0 denotes the observed DFTs after they have been reindexed and X = (X1, X2, . . . , XL)0 is a matrix containing the reindexed input vectors. The model is a complex regression model with Y = Y c−iY s, X =

Xc − iXs, B = Bc − iBs, and V = V c − iV s denoting the representation in terms of the usual cosine and sine transforms. Show the partitioned real regression model involving the 2L × 1 vector of cosine and sine transforms, say