Pre-sorted multiple-branch successive interference cancelation detection for high-dimensional MIMO systems

In multiple-input multiple-output (MIMO) systems, the maximum likelihood detection (MLD) can obtain the maximum receive diversity order while its computational complexity grows exponentially with the number of constellation points and the transmitted streams. Lattice reduction (LR)-aided detection can parallel the diversity order of MLD with low complexity; however, its performance gap to MLD becomes wider with the increase of the system dimension that is expected with very large MIMO systems. In this paper, pre-sorted multiple-branch successive interference cancelation (PS-MB-SIC) detection techniques are proposed. Simulation results show that the proposed algorithm can approach the diversity order of MLD with much lower complexity and is suited to high-dimensional MIMO systems.