PCA-Aided Linear Precoding in Massive MIMO Systems with Imperfect CSI

Algorithm 1

The PCA-LP precoding algorithm.

(1)	Input: .
(2)	Generate the matrix as in (16).
(3)	Compute the matrices and .
(4)	Apply QR decomposition to : .
(5)	Apply the SVD to : .
(6)	Create the matrices and .
(7)	Generate the precoding matrix .
(8)	Repeat Step 3 to Step 7 until the precoding matrices for all users are obtained.
(9)	Create the matrices and by arranging and to the main diagonals of and as in (24) and (25), respectively.
(10)	Output: , , , .