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Minimum Euclidean Distance Based Precoders for MIMO Systems Using Rectangular QAM Modulations

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3 Author(s)
Quoc-Tuong Ngo ; IRISA, Univ. of Rennes I, Lannion, France ; Olivier Berder ; Pascal Scalart

From the feedback of the channel state information (CSI), precoding techniques improve the performance of multiple-input multiple-output (MIMO) systems by optimizing various criteria. In this correspondence, an efficient precoder that maximizes the minimum distance (dmin) of two received vectors is studied. This criterion leads to a nondiagonal precoding scheme and allows achieving a full diversity order. However, the optimized solution for MIMO systems using a high-order QAM modulation is rather complex and changes for different constellations. Therefore, we propose herein a general form of minimum Euclidean distance based precoders for all rectangular QAM modulations. It is shown that the new solution optimizes the distance dmin for small and large dispersive channels.

Published in:

IEEE Transactions on Signal Processing  (Volume:60 ,  Issue: 3 )