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A Fixed-Complexity Smart Candidate Adding Algorithm for Soft-Output MIMO Detection

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4 Author(s)
Milliner, D.L. ; Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA ; Zimmermann, E. ; Barry, J.R. ; Fettweis, G.

We present a soft-output multiple-input multiple-output (MIMO) detection algorithm that achieves near max-log optimal error rate performance with low- and fixed-computational complexity. The proposed smart ordering and candidate adding (SOCA) algorithm combines a smart-ordered QR decomposition with smart candidate adding and a parallel layer-by-layer search of the detection tree. In contrast to prior algorithms that use smart candidate adding, the proposed algorithm has fixed computational complexity, and it never visits a node more than once. Results indicate that the SOCA algorithm has an attractive performance-complexity profile for both fast and slow fading 4 × 4 and 8 × 8 MIMO channels with quadrature amplitude modulation (QAM) inputs.

Published in:

Selected Topics in Signal Processing, IEEE Journal of  (Volume:3 ,  Issue: 6 )

Date of Publication:

Dec. 2009

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