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In this paper, the authors study the iterative detection problem for a coded system with multi-ary modulation. They show that, with iterative Linear Minimum-Mean-Square-Error (LMMSE) detection, Superposition Coded Modulation (SCM) can provide performance superior to that with other traditional signaling schemes used in Trellis Coded Modulation (TCM) and Bit-Interleaved Coded Modulation (BICM). This finding provides a useful guideline for system design considering Inter-Symbol Interference (ISI) and other forms of interference. Simulation results are provided to illustrate the efficiency of the iterative LMMSE detection with different signaling schemes.
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