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Fidelity Charts and Stopping/Termination Criteria for Iterative Multiuser Detection

David P. Shepherd ; Fredrik Brännström (Institutionen för signaler och system, Kommunikationssystem) ; Mark C. Reed
International Symposium on Turbo Codes and Related Topics, Munich, Germany, April 2006 (2006)
[Konferensbidrag, refereegranskat]

An iterative multiuser detection (IMUD) receiver is considered for a code-division multiple-access (CDMA) system with turbo codes. Fidelity is considered as a metric for convergence analysis and an approximation of fidelity as a function of variance of the log-likelihood ratios is introduced. Fidelity charts are compared with extrinsic information transfer (EXIT) charts as tools for convergence analysis and a close approximation of the relationship between fidelity and mutual information is proposed. We then use this function to approximate a closed form expression for the EXIT function of an interference canceller. Further, we propose a new stopping criterion for the turbo decoder and the IMUD receiver which achieves complexity saving of up to 50% over conventional designs.



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Denna post skapades 2011-02-25. Senast ändrad 2015-03-06.
CPL Pubid: 137325