Abstract

In massive multiple-input multiple-output (M-MIMO) systems, with the increase of the number of receiving antennas at the base station (BS), linear detectors are able to achieve near-optimal performance due to M-MIMO channel property of asymptotic orthogonality. However, these detectors involve exact matrix inversion with high complexity. To avoid the matrix inversion, the iterative conjugate gradient (CG) algorithm for signal detection has been recently proposed. However, this algorithm is highly synchronous. In this paper, we propose a modified CG (M-CG) algorithm to reduce the synchronization steps in order to shorten the computational time. Simulation results show the efficiency of the proposed algorithm.