Title :
Precoded opportunistic multiuser detection
Author :
Kumar, Narendra ; Trivedi, Aditya
Author_Institution :
Dept. of Inf. & Commun. Technol., Indian Inst. of Inf. Technol. & Manage., Gwalior, India
Abstract :
In this paper, we study multi-user multi-input-multi-output (MU-MIMO) wireless system for spectrum sharing over a limited bandwidth, in which transmit covariance matrices of the coexisting users independently updated in an iterative manner for individual rate maximization. This problem was solved in the literature by an advanced decoding method, in which every user opportunistically cancels the co-channel interference from the coexisting users using multiuser detection techniques, hence termed opportunistic multiuser detection (OMD). This paper also studies the signal-to-leakage-plus-noise ratio (SLNR) based precoding for MU-MIMO channels based on OMD. SLNR improves as interference mitigates due to use of precoding in OMD. Simulation results show the achievable throughput gains of precoded OMD over the conventional single-user decoding (SUD) and plain OMD.
Keywords :
MIMO communication; cochannel interference; covariance matrices; decoding; interference suppression; multiuser detection; precoding; radio spectrum management; wireless channels; MU-MIMO channel; MU-MIMO wireless system; OMD precoding; SLNR based precoding; SUD; cochannel interference cancellation; decoding method; interference mitigation; limited bandwidth; multiuser multiinput-multioutput wireless system; precoded opportunistic multiuser detection; rate maximization; signal-to-leakage-plus-noise ratio; single-user decoding; spectrum sharing; throughput gain; transmit covariance matrices; Decoding; Interference; MIMO; Multiuser detection; Receivers; Throughput; Vectors;
Conference_Titel :
Communication Systems (ICCS), 2012 IEEE International Conference on
Conference_Location :
Singapore
Print_ISBN :
978-1-4673-2052-8
DOI :
10.1109/ICCS.2012.6406162
