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This paper is concerned with Orthogonal Frequency Division Multiplexing Interleave-Division Multiple-Access (OFDMIDMA) systems over frequency-selective fading channels. Deliberate clipping is applied to reduce the Peak-to-Average Power Ratio (PAPR) of each user's transmitted signal. An iterative Multi-User Detection (MUD) technique is developed to recover the performance loss due to clipping. A semi-analytical Signal-to-Noise Ratio (SNR) evolution technique is proposed, which can provide quick and accurate prediction of the iterative MUD performance. Numerical results show that the performance of OFDM-IDMA is not sensitive to the frequency selectivity of channels, and OFDM-IDMA is more power-efficient than other alternative multi-carrier transmission techniques.
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