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Orthogonal frequency division multiplexing with index modulation (OFDM-IM) isa novel scheme where the information bits are conveyed through the subcarrieractivation pattern (SAP) and the symbols on the active subcarriers.Unfortunately, OFDM-IM inherits the high peak-to-average power ratio (PAPR)problem from the classical OFDM. The OFDMIM signal with high PAPR inducesin-band distortion and out-of-band radiation when it passes through high poweramplifier (HPA). There are attempts to reduce PAPR by adding dither signals inthe idle subcarriers, where the dither signals can have various amplitudeconstraints according to the characteristic of the corresponding OFDM-IMsubblock. But, there is no result for the specific amplitude constraint for thedither signals over a Rayleigh fading channel. In this letter, based onpairwise error probability (PEP) analysis, a specific constraint for the dithersignals is derived over a Rayleigh fading channel.

Dither Signal Design for PAPR Reduction in OFDM-IM over a Rayleigh Fading Channel