Abstract
We use the extrinsic information transfer (EXIT) chart to analyze the convergence of iteratively decoded bit-interleaved coded modulation with channel signal-to-noise ratio mismatch. For additive white Gaussian noise channels, we develop a generalized model for the a priori inputs, which is parameterized by the ratio /spl eta/ between the noise variance estimate and its true value. We show that the demapper and decoder transfer functions are very sensitive to overestimation of the noise variance (/spl eta/>0 dB), while indifferent to underestimation in a fairly large region (/spl eta//spl isin/[-6,0] dB). The accuracy of our EXIT chart prediction is verified by simulation.
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