Advanced transmitters with combined crest factor reduction and digital predistortion techniques

Farabegoli, A.; Sogl, B.; Mueller, Jan-Erik; Weigel, Robert

doi:10.1109/rws.2014.6830153

Cited by 8 publications

(5 citation statements)

References 4 publications

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“…In other words, combining CFR and DPD pushes the operation region of the PA near its 1-dB compression point. References [20][21][22] presented the research of the effects by CFR in DPD systems, and the experimental results validate that the introduction of CFR will bring a few drawbacks to the system.…”

Section: Relationship Between Cfr and Dpdmentioning

confidence: 98%

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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Section: Relationship Between Cfr and Dpdmentioning

confidence: 98%

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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“…To mitigate them, clipping & filtering techniques can be used. However, such techniques are not able to fully restrict the peak-regrowth, and, above all, to properly control the in-band noise (i.e., avoiding EVM degradation) [9,16,17].…”

Section: Clipping and Filteringmentioning

confidence: 99%

“…[17]. Scaling function used to scale down the PAPR of the complex signal is given by C sc (n), while C eff (i) are the coefficients selected such that the product of the original signal x(n) and the scaling function C sc (n) does not exceed the maximum clipping threshold A th .…”

Section: Clipping and Windowingmentioning

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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“…But, this power back-off is not desirable because it reduces the power efficiency. Farabegoli proposed a combining CFR and adaptive DPD in the [5], which demonstrated the strength of combination totally. But it does not propose specific solutions.…”

Section: Introductionmentioning

confidence: 99%

Linearization Approach of Combined Digital Predistortion with Crest Factor Reduction

2016

Proceedings of 2016 the 6th International Workshop on Computer Science and Engineering

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In recent years, digital predistortion (DPD) has been wildly used in the nonlinear compensation of power amplifier. However, saturation distortion which caused by high peak-to-average ratios (PAPR) of the input signal cannot be compensated by DPD perfectly. Therefore, power amplifier should work in certain back-off and results in low efficiency. In this paper, a new method of combined adaptive DPD and crest factor reduction (CFR) is proposed to reduce PAPR, which uses selective mapping (SLM) and companding transform (CT). Besides, an adaptive DPD utilized the LS-LMS algorithm is proposed, which shows stable and fast convergence in the proposed system. Simulation results show that the proposed method can achieve a desirable linearization performance and decrease the predistorted signal's PAPR by 7dB.

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Advanced transmitters with combined crest factor reduction and digital predistortion techniques

Cited by 8 publications

References 4 publications

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

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

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

Linearization Approach of Combined Digital Predistortion with Crest Factor Reduction

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