Abstract
We describe a computational algorithm for the evaluation of error probabilities of multilevel modulation codes. This is based on the derivation of a trellis cataloging the words of the component codes and of a suitable set of branch labels depending on the channel on which the transmission takes place (additive white Gaussian noise channel, fading channel with or without channel state information). The error probability is upper bounded by the transfer function of this trellis, which is derived in closed form.
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