Fidelity Charts and Stopping/Termination Criteria for Iterative Multiuser Detection
Paper i proceeding, 2006

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.


David P. Shepherd

Australian National University

Fredrik Brännström

Chalmers, Signaler och system, Kommunikations- och antennsystem, Kommunikationssystem

Mark C. Reed

Australian National University

International Symposium on Turbo Codes and Related Topics, Munich, Germany, April 2006



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