In iterative IDMA scheme, the users are distinguished with various chip-level interleaving sequences instead of user-specific signature sequences as in conventional code-division multiple-access (CDMA) scheme. A set of interleavers is considered to be practical if it has zero correlation with each other and also easy to generate as well requires minimal bandwidth during communication process. A properly defined correlation between user-specific interleavers can be utilized to formulate a minimal collision criterion, where zero-correlation (i.e., orthogonality) implies no collision. In this paper, a practical interleaver has been proposed for interleave-division multiple-access (IDMA) systems. Simulation results show that the proposed interleaver performs even better to random interleavers initially reported for iterative IDMA system.
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