Enhancing PAPR Reduction in 5G Systems: A Novel Precoding Approach for UF-OFDM and Filtered-OFDM Modulations

Abstract

For both the UF-OFDM and the F-OFDM situations in this intended system, a precoding-based PAPR reduction strategy is suggested. In this system, the precoding procedure uses the ZadoffChu Transform. The precoding method is applied after the QAM modulation of the input bit stream. Following the inverse discrete Fourier transform on the data streams for UF-OFDM, filtering is then used. Data are sent across the channel when a Chebyshev filtering procedure is completed. In comparison to Butterworth filters, Chebyshev filters have a steeper roll-off and higher passband ripple or stopband ripple.With certain ripples in the passband, Chebyshev filters have the feature of minimising the difference between the idealised and real filter characteristics across the filter's range. In addition, the data are modulated for the F-OFDM process before being subjected to the spectrum shaping filter after performing the inverse discrete Fourier transform and obtaining the cyclic prefix. Here, the AWGN channel is the channel under consideration. The reverse processes are then carried out. Additionally, the BER, PAPR, and IAPR are dependent on the output produced when evaluating performance.