An Improved GreenOFDM Scheme for PAPR Reduction

Abstract

In this paper, we propose an improvement to a recent Peak-to-Average Power Ratio (PAPR) reduction technique for Orthogonal Frequency Division Multiplexing (OFDM), the GreenOFDM. This technique, which is inspired by SeLected Mapping (SLM), generates several waveform candidates using a given number of Inverse Fast Fourier Transforms (IFFT), and selects the one with the lowest PAPR for the transmission of the OFDM symbol. For U IFFTs, GreenOFDM provides better PAPR reduction capabilities than SLM-OFDM as it increases the number of waveform candidates from U (for SLM-OFDM) to U2/4. In this work, we propose an extension of the GreenOFDM that further increases the number of waveform candidates by a factor of 4 (from U2/4 to U2), or equivalently reduces by a factor of 2 the number of IFFTs for a same PAPR performance. Compared to SLM-OFDM, the improved GreenOFDM technique reduces the complexity by requiring only the square-root of the number of IFFTs for a same PAPR reduction performance. Furthermore, exciting methods for additional complexity reduction are also implemented and discussed.

An Improved PAPR Reduction Scheme using Green OFDM

“…Finally, PAPR readings and PAPR reductions are tallied and recorded for all U. Additionally, the data will be examined using CCDF simulation, which serves as an indicator of how well each strategy reduces PAPR. There is another technique to analyze the PAPR reduction of these methods, according to [4]. With the help of the provided N subcarriers, U waveform, and CCDF (γ) probability, you may use this method to estimate the PAPR.…”

“…The Green OFDM method is an improved variant of SLM OFDM that generates a variety of candidate symbols, allowing for a larger number of waveform possibilities without adding more Inverse Fast Fourier Transform (IFFT) operations and complicating processing. More applicants will result in a wider range of PAPR values, and the candidates who are chosen will have a lower PAPR value [4]. Therefore, the Green OFDM approach is a more logical strategy to lower the PAPR value than the original SLM OFDM.…”

“…The suggested method outperforms other SLM OFDM methods according to [1], which produce signal candidates from U IFFT that already exist. A Green OFDM extension was suggested in [4],…”

Peak-Average-Power Ratio Techniques for 5G Waveforms Using D-SLM and D-PTS

“…The demand for high data speed is increasing rapidly, forcing academicians, engineers, and industry people to design more robust, high-quality, and high-speed devices. In the present scenario, Fourth Generation (4G) standards based on OFDM are implemented [2]. Several applications are based on the OFDM waveform.…”