9 Low-Complexity PAPR Reduction Schemes Using SLM and PTS Approaches for Interleaved OFDMA
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One of the major drawbacks of multi-carrier systems is the high peak-to-average power ratio (PAPR) of the transmitted signals. In this paper, the proposed novel low-complexity selective mapping (SLM) and partial transmit sequences (PTS) schemes are applicable to interleaved orthogonal frequency division multiple access (OFDMA) uplink systems for PAPR reduction. The basic idea is to explore the special structure of interleaved OFDMA, so as to reduce the complexity of PAPR reduction. Current PAPR reduction techniques can be combined with the proposed structure, SLM and PTS are combined for instance. Simulation results show that compared with traditional techniques, the proposed technique can gain the same PAPR reduction but with considerable complexity reduction. The new SLM interleaved OFDMA scheme reduces the computational complexity, while it shows almost the same performance of PAPR reduction as that of the conventional SLM interleaved OFDMA scheme, the new PTS proposed can reduce the complexity too. This method needs side information in the receptor.