Efficient Soft-Output Generation Method for Spatially Multiplexed MIMO Systems

Junghyun KIM  Youn-Ok PARK  Seungjae BAHNG  

IEICE TRANSACTIONS on Communications   Vol.E92-B   No.11   pp.3512-3515
Publication Date: 2009/11/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.3512
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
MIMO,  spatial multiplexing,  QR-LRL,  

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A simple detector named QR-LRL for MIMO systems was proposed in and it was shown that QR-LRL approached the hard-output ML performance. However, its soft-output performance is not capable of approaching the near ML performance. In this letter, we propose a novel detection method which can generate reliable soft-outputs while avoiding the empty vector set problem. The proposed detector efficiently uses the upper triangular structure in QR decomposition. Simulation results show that the proposed detector can approach the near soft-output ML performance as well as hard-output with feasible complexity.