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Interleave-Division Multiple Access (IDMA) has recently been introduced as an attractive alternative to CDMA. IDMA employs user-specific inter-leavers combined with low-rate channel coding for user separation. In this paper, the authors consider a MIMO-IDMA system with increased spectral efficiency due to the use of higher-order symbol constellations. Based on a factor graph framework and the sum-product algorithm, they develop an iterative turbo multiuser receiver. Gaussian approximations for certain messages propagated through the factor graph lead to a complexity that scales only linearly with the number of users. To further reduce complexity, they introduce a selective message update scheme.
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