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.
Highlights
Orthogonal Frequency Division Multiplexing (OFDM) is a widely used modulation technique for wireless communication systems thanks to its high spectral efficiency and robustness against frequency-selective channel
Computer simulations were carried out to evaluate the Complementary Cumulative Distribution Function (CCDF) of Peak-to-Average Power Ratio (PAPR) of the GreenOFDMv2 method proposed in this work and to compare it with the previous methods (SLM-OFDM and the former GreenOFDM) and to the conventional OFDM
The PAPR threshold, for a given CCDF, and its evolution were investigated to know and predict the required number of Inverse Fast Fourier Transforms (IFFT) to stay under a given PAPR threshold for the different techniques and different number of subcarriers
Summary
Orthogonal Frequency Division Multiplexing (OFDM) is a widely used modulation technique for wireless communication systems thanks to its high spectral efficiency and robustness against frequency-selective channel. To counteract the above-mentioned limitations, several PAPR reduction schemes have been proposed in the literature (with well documented surveys like [6,7,8] that outline the most important schemes that have been proposed during the last couple of decades). These schemes could be classified like proposed by [7,8] into different but not exhaustive categories as follows: Telecom 2020, 1, 196–210; doi:10.3390/telecom1030014 www.mdpi.com/journal/telecom
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