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This paper tackles a power minimization problem of interleave-division multiple-access (IDMA) systems over a fading multiple-access channel. The problem is minimizing the total power received by the receiver while keeping the bit error rates (BERs) of all users below a predefined value. The original formulation of the problem has highly nonlinear and implicitly defined functions, which render most existing optimization methods inca- pable. A new formulation is proposed in this paper, whosedoi:10.1109/tvt.2008.919617 fatcat:mdi3ehy2hzcpngxqedgqgania4