Hybrid Kaczmarz and coordinate‐descent iterations for signal detection in massive MIMO systems

Abstract

A hybrid Kaczmarz and coordinate-descent (H-KCD) iterative algorithm is proposed for signal detection in massive MIMO systems. Together with the specially-designed orthogonal projection and decision operation during iterations, this approach outperforms the standalone usage of either the Kaczmarz or coordinate-descent iteration, and gives better error-rate performance than the linear minimum mean-squared error detection. Essentially, since the Gram matrix is not required for the proposed H-KCD scheme, it owns lower total computational complexity than some state-of-the-art iterative methods.