A Modified SLM Scheme for PAPR Reduction in OFDM Systems

Hu, Chi; Wang, Lingyin; Zhou, Zhuang

doi:10.1109/iceiec49280.2020.9152350

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…The role of the adaptive bias module is to add different biases in groups according to the amplitude variation of the signal, so that the bipolar OFDM signal becomes a unipolar positive real signal and improves the power efficiency. Selective mapping (SLM) [11] was originally designed to reduce the PAPR, and this letter changes the part of the SLM algorithm to screen for the lowest total bias required by the adaptive bias module, instead of the lowest PAPR. The selective mapping module complements the adaptive bias module to further improve the power efficiency of the system.…”

Section: Selectively Biased Ofdmmentioning

confidence: 99%

Selectively Biased Optical Orthogonal Frequency Division Multiplexing for Visible Light Communication Systems

Wu,

Shi,

Xie

et al. 2024

IEICE Commun. Express

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Traditional direct-current biased optical orthogonal frequency division multiplexing (DCO-OFDM) achieves unipolar signaling by adding a direct current (DC) bias and performing clipping. To suppress signal nonlinearity distortion caused by clipping, the DC bias needs to be set at a higher level, which results in low power efficiency of the DCO-OFDM. A scheme named Selectively Biased Optical OFDM (SBO-OFDM) was proposed in this letter. SBO-OFDM multiplies the OFDM signals with random phase sequences, selects the signal that requires the least amount of bias for transmission, and dynamically adds the bias based on signal variations to improve power efficiency. The experimental results demonstrate that the proposed SBO-OFDM exhibits a significant decrease in requirement of the normalized optical bit energy to noise power ratio [E b(o p t ) /N o ] compared to DCO-OFDM, ACO-OFDM, and PAM-DMT at a BER of 10 −3 . The results indicate that SBO-OFDM outperforms traditional optical OFDM (O-OFDM) in terms of power efficiency and have better BER performance than traditional DCO-OFDM.

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Section: Selectively Biased Ofdmmentioning

confidence: 99%

Selectively Biased Optical Orthogonal Frequency Division Multiplexing for Visible Light Communication Systems

Wu,

Shi,

Xie

et al. 2024

IEICE Commun. Express

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“…In [24], a linear addition-based method called Green-OFDM was proposed to reduce the SLM computational complexity; however, this method requires the phase rotation vectors involved in the linear addition process to be orthogonal. To increase the number of alternatives to more than twice the square of the number of IFFT processes employed, an enhanced version of the Green-OFDM method [24] was developed in [25]. The scheme of [25] reduces the computational complexity by fifty percent.…”

Section: Introductionmentioning

confidence: 99%

“…To increase the number of alternatives to more than twice the square of the number of IFFT processes employed, an enhanced version of the Green-OFDM method [24] was developed in [25]. The scheme of [25] reduces the computational complexity by fifty percent. In [26], a different linear addition-based method was utilized to lower SLM computational complexity by roughly seventy percent.…”

Section: Introductionmentioning

confidence: 99%

Low-complexity selective mapping technique for PAPR reduction in downlink power domain OFDM-NOMA

Mounir

Youssef

Aboshosha

2023

EURASIP J. Adv. Signal Process.

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To support ultra-massive connectivity, non-orthogonal multiple access (NOMA) techniques are expected to be used in 6G instead of conventional orthogonal multiple access (OMA) techniques. Furthermore, given that orthogonal frequency division multiplexing (OFDM) was used by 4G and 5G, NOMA is expected to be combined with OFDM to mitigate frequency selectivity in multipath channels. However, after passing through nonlinear high power amplifiers (HPAs), OFDM-NOMA has reportedly suffered from nonlinear distortion due to the high peak-to-average power ratio (PAPR) problem, thus reducing users’ achievable data rates, sum rate capacity, and users’ bit error rate after going through nonlinear HPAs. Many PAPR reduction techniques have been introduced in the literature; however, high PAPR reduction gain comes at the expense of computational complexity. In this paper, a novel selective mapping (SLM) scheme for PAPR reduction in OFDM-NOMA systems is proposed. By utilizing the structure of the OFDM-NOMA transmitter, the proposed SLM scheme achieves the same performance as that of the conventional SLM scheme while requiring less computational complexity.

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A Hybrid Clipping and SLM Technique for PAPR Reduction in OFDM Systems

Algaderi,

Zatout

2024

Communications in Computer and Information Science

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A Modified SLM Scheme for PAPR Reduction in OFDM Systems

Cited by 9 publications

References 14 publications

Selectively Biased Optical Orthogonal Frequency Division Multiplexing for Visible Light Communication Systems

Selectively Biased Optical Orthogonal Frequency Division Multiplexing for Visible Light Communication Systems

Low-complexity selective mapping technique for PAPR reduction in downlink power domain OFDM-NOMA

A Hybrid Clipping and SLM Technique for PAPR Reduction in OFDM Systems

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