Title :
Log-likelihood-ratio ordered successive interference cancellation in multi-user, multi-mode MIMO systems
Author :
Chun, Young Jin ; Kim, Sang Wu
Author_Institution :
Dept. of Electr. & Comput. Eng., Iowa State Univ., Ames, IA
fDate :
11/1/2008 12:00:00 AM
Abstract :
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.
Keywords :
MIMO communication; interference suppression; maximum likelihood estimation; a posteriori information; beamforming; log-likelihood-ratio; multi-input multi-output systems; multimode MIMO systems; multiuser MIMO systems; ordered successive interference cancellation; spatial multiplexing; Array signal processing; Frequency; Interference cancellation; MIMO; Radiofrequency interference; Receiving antennas; Samarium; Signal processing; Silicon carbide; Transmitting antennas; Multi-user MIMO, successive interference cancellation; log-likelihood ratio;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2008.080986
