Abstract
In this paper, two non-linear companding transforms, namely exponential and sine hyperbolic, are proposed to reduce the peak to average power ratio (PAPR) of the orthogonal time frequency space (OTFS) modulation signal. The companding transforms are normalized such that the average power remains the same before and after companding. The resulting transforms have a saturation kind of characteristics for larger amplitudes of a signal while enhancing the smaller amplitudes slightly, which leads to a reduction of PAPR significantly. To validate the companding transforms in the OTFS system, we analyze the results in terms of PAPR, transform gain, attenuation factor, and bit error rate (BER). Also, compared the PAPR and BER performance of OTFS with OFDM, and the existing μ-law and clipping methods in OTFS. The results signify that the proposed companding transforms outperform the existing μ-law and clipping methods for PAPR reduction.
Published Version
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