A Reduced MIMO Detector Using Post SNR Ordering

Hye-Yeon JEONG  Hyoung-Kyu SONG  

IEICE TRANSACTIONS on Information and Systems   Vol.E96-D   No.6   pp.1398-1401
Publication Date: 2013/06/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.E96.D.1398
Print ISSN: 0916-8532
Type of Manuscript: LETTER
Category: Information Network
MIMO-OFDM detection,  Combining detector,  DFE,  QRD-M,  

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In this letter, a novel adaptive detector that combines DFE and QRD-M is proposed for MIMO-OFDM system. QR decomposition (QRD) is commonly used in many MIMO detection algorithms. In particular, sorted QR decomposition (SQRD) is an advanced algorithm that improves MIMO detection performance. The proposed detector uses SQRD to achieve better performance. To reduce the computational complexity, the received layers of each subcarrier are ordered by using the post SNR and are detected by DFE and QRD-M detector based on the order. Therefore, the proposed detector structure is varied according to the channel state. In other words, the proposed detector achieves a good tradeoff between complexity and performance. A simulation confirms the substantial performance improvements of the proposed adaptive detector with only slightly greater complexity than the conventional detector.