Improvement of the MIMO detection through a hierarchical K-best OSIC-SE system

Sphere detection and Ordered Successive Interference Cancellation (OSIC) technologies are the most important techniques in multiple input multiple output (MIMO) detection. In this paper, a layered MIMO detection technology proposed which combines OSIC with SE algorithm, and then improvement is made by using K-best with fixed computational complexity. The proposed algorithm distributes layers to the two detect techniques and adjusts the ratio depends on SNR level. And then do the K-best improvement to the proposed algorithm, to fix the complexity and convenient for engineering implementation. By simulations in 4×4 uncoded MIMO systems with Quadrature Amplitude Modulation (QAM), we have demonstrated that this improved algorithm can achieve low and fixed computational complexity with a little degradation in performance.