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We describe some methods for evaluating error probabilities of infinite signal constellations and requiring only a finite number of terms. These methods are applicable, for example, t o convolutional codes decoded with a finite-depth Viterbi algorithm and to signal constellations carved from lattices. Coded modulations based on lattices and convolutional or block codes can also be dealt with.As an example of application, we analyze a variablerate 3-stage coded modulation encoder/decoder, which is being built and is based on a combination of convolutional codes with a single-parity-check block code.

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