Peak-to-Average Power Reduction of OFDM Signals by Convex Optimization: Experimental Validation and Performance Optimization

Nader, Charles; Händel, Peter; Björsell, Niclas

doi:10.1109/tim.2010.2050360

Cited by 24 publications

(10 citation statements)

References 12 publications

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“…The simplest approach might be to remove the largest amplitude spikes by clipping techniques, but there are more powerful techniques that utilize convex optimization to basically minimize the PAPR under constraints on the tolerable error in the modulated signal; we refer to [2,154,188] for further details on this subject. The combination of beamforming optimization and distorting of the signal for PAPR reduction seems to be an open problem.…”

Section: Multi-carrier Systemsmentioning

confidence: 99%

Optimal Resource Allocation in Coordinated Multi-Cell Systems

Björnson

Jorswieck

2012

FNT in Communications and Information Theory

149

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Section: Multi-carrier Systemsmentioning

confidence: 99%

Optimal Resource Allocation in Coordinated Multi-Cell Systems

Björnson

Jorswieck

2012

FNT in Communications and Information Theory

149

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“…In this section, OFDM PAPR reduction using convex optimization, as formulated in [6] and [7], is briefly reviewed. The optimization method is a state-of-art method in shaping signals that reduces the time domain peaks by redistributing the constellation symbols while satisfying constraints on inband errors and out-of-band emissions.…”

Section: A Papr Reduction As a Convex Problemmentioning

confidence: 99%

“…Some of them target to reduce the nonlinearity effect by digitally pre-distorting (DPD) the signals [2], [3]; while others aim to reduce the PAPR, i.e. the required back-off margin [4]- [7].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Performance Evaluation of Peak-to-Average Power Ratio Reduction and Digital Pre-Distortion for OFDM Based Systems

Nader

Landin

Moer

et al. 2011

IEEE Trans. Microwave Theory Techn.

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This is a submitted version of a paper published in IEEE transactions on microwave theory and techniques.Citation for the published paper: Nader, C., Landin, P., Van Moer, W., Björsell, N., Händel, P. (2011) Abstract-In this paper, we evaluate the effect of applying peak-to-average power ratio (PAPR) reduction and digital pre-distortion (DPD) on two types of radio frequency power amplifiers when an orthogonal frequency division multiplexing (OFDM) signal is used. The power amplifiers under test are a standard class-AB amplifier and a Doherty amplifier. The PAPR reduction methods are based on a state-of-the art convex optimization formulation and on the standard clipping and filtering technique. The DPD method consists of modeling the behavior of the power amplifier using a parallel Hammerstein model, and then extracting the inverse parameters based on the indirect learning architecture. To achieve better DPD performance, extracting the DPD parameters based on multiple-step iterations is investigated. The cases where PAPR reduction and DPD are applied separately and combined are studied and investigated. Power amplifier figures of merit are evaluated. Good performance is shown when combining both pre-processing techniques up to a certain operating point where DPD performance deteriorates due to generation of strong peaks in the signal. In addition, a difference in the power amplifier behavior is reported and analyzed.

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“…The main approach is reducing the PAPR, but a peak reduction of the complex baseband signal is generally at the expense of additional distortions. In recent years, some scholars have proposed the technique of combining the crest factor reduction (CFR) and digital predistortion (DPD) [8][9][10][11][12][13][14][15][16][17], which will make considerable improvement in both efficiency and linearity. In [14], a synergetic CFR and DPD design is discussed, which uses a structure similar to the situation in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

A Robust Augmented Combination of Digital Predistortion and Crest Factor Reduction for Rf Power Amplifiers

Zhao¹,

Yu²,

Jian³

et al. 2015

PIER C

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Abstract-This paper proposes a robust combination of digital predistortion (DPD) and crest factor reduction (CFR) for radio frequency (RF) power amplifiers (PAs). It is constructed using the architecture of CFR-DPD connected with a compensation module (CM). The compensation module is introduced to achieve mutual compensation between the output signals of CFR and DPD, and this can reduce the damage to the signal by CFR. The combination of CFR-DPD-CM provides the means to exploit margins in the transmitter performance, allowing the tradeoff among peak-to-average power ratio (PAPR), adjacent channel power ratio (ACPR) and error vector magnitude (EVM). The proposed combination of CFR-DPD-CM is assessed using a GaN Class-F PA driven by two modulated signals (a 4-carrier OFDM signal and a WCDMA 1001 signal with 20-MHz bandwidth), and a GaN Doherty PA driven by a 15-MHz long-term evolution (LTE) signal. The experimental results show that when the CFR reduces the PAPR about 4 dB, applying the proposed combination of CFR-DPD-CM, the average reduction of ACPR is 5.12 dB, and the average reduction of EVM is 1.26% compared with the conventional architecture of CFR-DPD.

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Peak-to-Average Power Reduction of OFDM Signals by Convex Optimization: Experimental Validation and Performance Optimization

Cited by 24 publications

References 12 publications

Optimal Resource Allocation in Coordinated Multi-Cell Systems

Optimal Resource Allocation in Coordinated Multi-Cell Systems

Performance Evaluation of Peak-to-Average Power Ratio Reduction and Digital Pre-Distortion for OFDM Based Systems

A Robust Augmented Combination of Digital Predistortion and Crest Factor Reduction for Rf Power Amplifiers

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