Power amplifier linearization with digital pre-distortion and crest factor reduction

Sperlich, R.; Park, Y.; Copeland, G. S.; Kenney, J.S.

doi:10.1109/mwsym.2004.1336077

Cited by 35 publications

(10 citation statements)

References 2 publications

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“…Unfortunately, they are not adequate enough to generate signals which can meet the stringent requirements of modern communication standards. In the following subsections, pros and cons of these conventional CFR techniques are briefly discussed, highlighting their limiting factors [6,8,[10][11][12].…”

Section: Conventional Cfr Techniquesmentioning

confidence: 99%

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Enhancing Power Efficiency of Doherty Power Amplifiers Using Windowing Based Crest Factor Reduction Technique

Vikraman¹,

Giofrè²,

Colantonio³

2016

PIER C

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Abstract-This paper investigates the performance of a Windowing Based Crest Factor Reduction (CF R W B ) technique, to enhance the power efficiency of Radio Frequency (RF) power amplifiers. In particular, CF R W B is implemented on a Doherty Power Amplifier (DP A) in conjunction with Generalized Memory Polynomial (GM P DP D ), and Volterra series based Digital Predistortion (V DP D ) techniques. Key features like spectral regrowth, Peak to Average Power Ratio (P AP R) reduction, efficiency improvement and Error Vector Magnitude (EV M ) have been used to measure the efficacy of the proposed method. Both simulation and experimental results show that the proposed combination of CF R W B technique with GM P DP D and V DP D is able to reduce the P AP R of the complex input signals by nearly 60%, with minimal degrading of the EV M and spectral regrowth. Moreover, such signal with reduced P AP R can be used to overdrive the DPA, allowing for a relevant average efficiency enhancement (i.e., up to 25%), while fulfilling the requirements of modern communication standards such as Wideband Code Division Multiple Access (W CDM A) and long-term evolution (LT E).

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Section: Conventional Cfr Techniquesmentioning

confidence: 99%

“…However, even if the DPA has the relevant capability to increase the average efficiency, when working with varying envelope signals, its linearity is usually worsen as compared to other PAs topologies [6,7]. Therefore, methods and solutions to improve the DPA linearity, without worsening its efficiency behavior, are of great interest.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Power Efficiency of Doherty Power Amplifiers Using Windowing Based Crest Factor Reduction Technique

Vikraman¹,

Giofrè²,

Colantonio³

2016

PIER C

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“…Sperlich [4] uses an interpolation technique to reduce CFR by selectively adding uncorrelated in-band noise to the signal. This improves spectral regrowth at the expense of EVM performance.…”

Section: Signal Characteristics Of Wireless Standardsmentioning

confidence: 99%

Linearity and efficiency enhancement strategies for 4G wireless power amplifier designs

Larson

Kimball

Asbeck

2008

2008 IEEE Custom Integrated Circuits Conference

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Next generation wireless transmitters will rely on highly integrated silicon-based solutions to realize the cost and performance goals of the 4G market. This will require increased use of digital compensation techniques and innovative circuit approaches to maximize power and efficiency and minimize linearity degradation. This paper summarizes the circuit and system strategies being developed to meet these aggressive performance goals.

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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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Power amplifier linearization with digital pre-distortion and crest factor reduction

Cited by 35 publications

References 2 publications

Enhancing Power Efficiency of Doherty Power Amplifiers Using Windowing Based Crest Factor Reduction Technique

Enhancing Power Efficiency of Doherty Power Amplifiers Using Windowing Based Crest Factor Reduction Technique

Linearity and efficiency enhancement strategies for 4G wireless power amplifier designs

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

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