Linear Companding Scheme to Reduce PAPR and Spectral Regrowth in T-OFDM System with HPA
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Abstract
As illustrated in literature, T-OFDM achieved a lower clipping probability and reduces the side-lobe values of the autocorrelation function of the input vector then suppressing the high peak power of the transmitted samples with non-Gaussian distribution. Moreover, the high diversity features of the proposed structure led to substantial improvements in the system performance with frequency selective fading channel. Nevertheless, peak reduction is decreased with the Gaussian distribution of subcarrier numbers, as well as, the in-band distortion is susceptible to non-linearity of high power amplifiers (HPAs). Consequently, the smaller clipping probability and lower block error rate characteristics of T-OFDM are embedded with a new linear companding (LC) technique to construct a structure of T-OFDM-LC system. In the proposed T-OFDM-LC scheme, low-amplitude samples are enlarged, while high-amplitude samples are compressed linearly in the time domain. This linear amplitude transformation is designed to reduce the peak-to-average power ratio (PAPR) while preserving the average power of the transmitted signal. The proposed T-OFDM-LC system acquires preferable achievement in PAPR reduction and spectral regrowth decreasing comparable with the T-OFDM system when using under the negative ramification of HPAs.
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