Exit charts for turbo receivers in MIMO systems

Iterative exchange of information between a decoder and a front-end receiver was shown to improve the performance when comparing to noniterative approach. This so-called turbo processing may be described using extrinsic information transfer (EXIT) charts which were already used in case of turbo decoders and turbo-equalizers. This work extends the EXIT charts technique to describe the behavior of MIMO narrowband turbo receivers and explains the main difficulties in the EXIT analysis for Rayleigh fading channels.