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Soft-Decision Algorithm with Low Complexity for MIMO Systems Using High-Order Modulations
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 Title & Authors
Soft-Decision Algorithm with Low Complexity for MIMO Systems Using High-Order Modulations
Lee, Jaeyoon; Kim, Kyoungtaek;
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 Abstract
In a log likelihood ratio(LLR) calculation of the detected symbol, multiple-input multiple-output(MIMO) system applying an optimal or suboptimal algorithm such as a maximum likelihood(ML) detection, sphere decoding(SD), and QR decomposition with M-algorithm Maximum Likelihood Detection(QRM-MLD) suffers from exponential complexity growth with number of spatial streams and modulation order. In this paper, we propose a LLR calculation method with very low complexity in the QRM-MLD based symbol detector for a high order modulation based MIMO system. It is able to approach bit error rate(BER) performance of full maximum likelihood detector to within 1 dB. We also analyze the BER performance through computer simulation to verify the validity of the proposed method.
 Keywords
MIMO;LLR;ML;QRM-MLD;BER;
 Language
Korean
 Cited by
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한국통신학회논문지, 2016. vol.41. 1, pp.51-57 crossref(new window)
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중앙 집중형 밀리미터파 기반 다중 스팟 빔 셀룰러 시스템,박순기;최용석;김태중;

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