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A K-user multi-rate code is proposed for a Gaussian multiple access channel with binary inputs, equal-power, and symbol synchronisation. In this multi-rate transmission, K users are equally divided into M groups. For each user in the mth group, a rate- 1/qm regular repeat-accumulate code serially concatenated with a length- Lm spreading is employed. The transmitted rate of each user in the mth group...
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