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

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3 Author(s)
Ngo, Q. ; IRISA, Univ. of Rennes I, Lannion, France ; Berder, O. ; Scalart, P.

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.

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