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Enhanced Groupwise Detection with a New Receive Combiner for Spatial Multiplexing MIMO Systems

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4 Author(s)
Sung-Hyun Moon ; School of Electrical Engineering, Korea University, Seoul, Korea ; Jeongsik Jeong ; Heunchul Lee ; Inkyu Lee

In this letter, we propose a new groupwise receive combiner design for multiple-input multiple-output spatial multiplexing systems. The conventional group detection (GD) suffers from a considerable performance loss since the noise components are not taken into account. The output signal-to-interference-plus-noise ratio (SINR) is defined in each subgroup in order to consider both the desired signal and noise statistics. Adopting the real-valued representation, we provide an optimal receive combiner which maximizes the SINR with a general group size. The simulation results show that the proposed scheme achieves a large performance gain over the conventional GD in coded systems. Also, when combining with near-optimal detection algorithms such as sphere decoder, the proposed GD scheme offers a comparable performance with significant reduced complexity.

Published in:

IEEE Transactions on Communications  (Volume:58 ,  Issue: 9 )