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Log-likelihood-ratio ordered successive interference cancellation in multi-user, multi-mode MIMO systems

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2 Author(s)
Young Jin Chun ; Dept. of Electr. & Comput. Eng., Iowa State Univ., Ames, IA ; Sang Wu Kim

Log-likelihood-ratio (LLR) ordered successive interference cancellation (SIC) scheme is analyzed in multi-user, multi-mode, multi-input multi-output (MIMO) systems in which each user may choose between two operation modes: spatial multiplexing or beamforming. The main idea is to detect and cancel the user signal in order of LLR which provides a posteriori information about the reliability of detection. The simulation results indicate that LLR-ordered SIC provides 1 ~ 3 dB gain over the conventional SNR-ordered SIC in multiuser MIMO system and the gain increases with increasing number of users.

Published in:

Communications Letters, IEEE  (Volume:12 ,  Issue: 11 )