Enhanced Detection with New Ordering Schemes for V-BLAST Systems

Abstract—This letter proposes a new optimal ordering method which minimizes error propagation in the vertical Bell-lab Lay-ered Space-Time (V-BLAST) by exploiting the whole filter output. A suboptimal ordering metric is also proposed which requires much reduced complexity compared to the optimal ordering metric. We also derive a simplified version of the suboptimal ordering metric which achieves a significant performance gain over the conventional ordering with minor additional complexity. Index Terms—Multiple-input multiple-output (MIMO) sys-tems, vertical Bell Labs layered space-time (V-BLAST), detection ordering. I