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In this paper, a modified extrinsic information transfer (EXIT) chartanalysis that takes into account the relation between mutual information (MI)and bit-error-rate (BER) is presented to study the convergence behavior ofblock Markov superposition transmission (BMST) of short codes (referred to asbasic codes). We show that the threshold curve of BMST codes using an iterativesliding window decoding algorithm with a fixed decoding delay achieves a lowerbound in the high signal-to-noise ratio (SNR) region, while in the low SNRregion, due to error propagation, the thresholds of BMST codes become slightlyworse as the encoding memory increases. We also demonstrate that the thresholdresults are consistent with finite-length performance simulations.

EXIT Chart Analysis of Block Markov Superposition Transmission of Short Codes