A novel volume-based scheduling scheme for multiuser multiple-input multiple-output downlink system

Abstract

A new volume-based scheduling algorithm for user selection is proposed for a multiuser multiple-input and multiple-output downlink system based on block diagonalization precoding. The proposed algorithm has the advantage of the reduced computational complexity achieved by using the new volume-based user selection method that uses the product of the diagonal elements in the upper-triangular matrix obtained via Householder reduction procedure of QR factorization to the selected users channel matrix. The new algorithm provides the same sum-rate capacity in comparison with other user selection algorithms, such as semi-orthogonal user selection and capacity-based user selection algorithms, but with significantly reduced complexity.