A low-complexity Max-Log-MAP detector

Authors:
Nils Graef;Joachim S. Hammerschmidt;Carl-Erik W. Sundberg
Affiliations:
AMCC, Sunnyvale, CA and Agere Systems, Allentown, PA;Home Networking Division, Broadcom Corp., Sunnyvale, CA and Agere Systems, Wireless Systems, Allentown, PA;SundComm, Sunnyvale, CA
Venue:
IEEE Transactions on Communications
Year:
2009

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Abstract

A low-complexity soft-output Max-log-MAP (maximum a posteriori probability) detector for N2-QAM is exemplified for a 64-QAM 2×M multiple-input-multiple-output (MIMO) system, exhibiting the following novel features: (1) hierarchical formulation of the exhaustive metric calculation to reduce the number of candidate tests by a factor of N per received symbol, and (2) multiplier-free implementation of the exhaustive search with 8-fold parallelization. The computational complexity is reduced by a factor of about 250, resulting in a chip area of 0.031 mm2 using 65nm CMOS.