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An 8-state trellis code is described that uses a signal constellation from the 8-dimensional Gosset lattice E <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">8</inf> . It can be used for example to transmit data at 9.6, 14.4, and 19.2 kbits/s with a nominal coding gain of close to 6 dB.
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Calderbank et al. (1986) studied this question.
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