Improved SLM Scheme for Reducing the PAPR of QAM OFDM Signals

Zhou, Zhuang; Wang, Lingyin; Hu, Chi

doi:10.1109/eltech.2019.8839506

Cited by 3 publications

(5 citation statements)

References 18 publications

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“…Theoretical CCDF of PAPR is the upper bound of the PAPR performance and simulation results will never exceed these values. It is studied from the graph that the simulated results and analytical curves evaluated from expressions (17) are well approximated for our proposed scheme. In our proposed scheme the number of candidates C in =U+U 2 /4 results a decrease in the value with same number of IFFT computations as required in the conventional SLM and hence improves the PAPR performance of our designed system.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…With increase in number of candidates the PAPR reduction ability of the OFDM signal can be improved but this leads to equivalent rise in IFFT computations. The major concern in the conventional SLM-OFDM system is to reduce the PAPR value of the OFDM signals by increasing the number of candidates without any proportional rise in the number of IFFT"s. In the literature [13][14][15][16][17] many PAPR reduction techniques have been proposed for enhancing the number of candidate sequences in the SLM-OFDM system. These techniques aim to increase the candidate sequence of considering effects of bit redundancy and computational complexity of the SLM-OFDM system.…”

Section: Introductionmentioning

confidence: 99%

“…A variant of GreenOFDM Algorithm is suggested in [16] where the weighting factor α is used to generate the number of candidates. In [17] authors use the PSK modulated signal sequences, orthogonal phase factor sets and deformation parameter set to increase the number of candidate signals thereby improving the PAPR performance of the OFDM system. Another variant of GreenOFDM Algorithm is proposed in [18] where number of candidate sequences is increased to U 2 , in comparison to those in GreenOFDM Algorithm.…”

Section: Introductionmentioning

confidence: 99%

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Improved Selected Mapping Technique for Reduction of PAPR in OFDM Systems

Gupta¹,

Goel²

2020

IJACSA

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High peak to average power ratio (PAPR) is a limiting factor towards the performance of an OFDM system. Selected Mapping (SLM) is a popular peak to average power ratio (PAPR) reduction scheme used with the OFDM systems. In this technique, U set of candidate sequences are generated that leads to improvement in the PAPR reduction ability of the OFDM systems. The major concern of the conventional SLM is that as the number of candidates is increased, there is a proportional rise in the inverse fast Fourier transforms (IFFT) computations of the systems. In our article we have proposed a scheme in which we increase the number of candidate sequence as (U+U 2 /4) that leads to improved PAPR performance of the OFDM systems without any equivalent rise in the IFFT computations. It has been demonstrated that both the simulation and analytical results are well-approximated in our proposed schemes. We also estimate the threshold value of PAPR at a fixed value of complementary cumulative distribution function (CCDF) for different number of subcarriers and candidate sequences. Results demonstrate that our proposed scheme outperforms in terms of PAPR reduction ability of the OFDM signal and obtains effective PAPR threshold values with negligible loss in BER performance of the system.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improved Selected Mapping Technique for Reduction of PAPR in OFDM Systems

Gupta¹,

Goel²

2020

IJACSA

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“…GreenOFDM receives attention in the literature [24][25][26][27]. Some works compare the original GreenOFDM scheme with PTS variants but without using the same scheme [26,27].…”

mentioning

confidence: 99%

“…Other works aim to improve the PAPR reduction capabilities as in [24], but the results seem to come from a not so exhaustive simulation study. Finally, other works like [25] reducing the complexity by relaxing the PAPR reduction capability as it has been also proposed in other works [28].…”

mentioning

confidence: 99%

An Improved GreenOFDM Scheme for PAPR Reduction

Monsalve

Ros

Brossier

et al. 2020

Telecom

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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.

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