A Crest Factor Reduction Method in Digital Predistortion for Improvement of Power Efficiency

Zeng, Zhibin; Xie, Dian; Huang, Yaqian

doi:10.1109/iccsee.2012.90

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…Although GaN provides better efficiency, it is costlier compared to LDMOS transistor. Similar energy efficiency enhancement has been achieved through the use of crest factor reduction (CFR) and DPD with Doherty PA [17]. As per the recent studies, efficiency using LDMOS transistor for Micro eNodeB at 39 dBm average output power with 10 dB PAPR has been reported up to 60%.…”

supporting

confidence: 54%

Modified Output Combining 3-Stage Doherty Power Amplifier Design for LTE Micro eNodeB

Shah¹,

Thakker²,

Dalwadi³

et al. 2015

IJWMT

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This paper presents a highly efficient modified output combining 3-stage Doherty Power Amplifier (DPA) design using low power LDMOS transistor for Band 40, TD-LTE Micro eNodeB. In this design, modified output combining technique has been used in the output section which meets the output power requirements of Micro eNodeB which cannot be achieved by conventional 3-stage DPA. The modified DPA design achieves 65.3% power added efficiency (PAE) at 39 dBm average output power with 20 MHz LTE signal using 15 watt LDMOS Transistor. 3-stage modified output combining technique increases the linear output power by 1.1 dB and increases the Gain flatness versus power level. The use of Digital Pre-Distortion (DPD) along with modified 3-stage DPA design achieves the linearity requirements as per the 3GPP specifications. The modified DPA combining technique has provided potential economical solution by using low power LDMOS transistor with an advantage of high efficiency.

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supporting

confidence: 54%

Modified Output Combining 3-Stage Doherty Power Amplifier Design for LTE Micro eNodeB

Shah¹,

Thakker²,

Dalwadi³

et al. 2015

IJWMT

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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%

“…Crest Factor Reduction (CFR) techniques [8,9], in conjunction with Digital Predistortion (DPD) techniques are considered to be a promising solution to simultaneously achieve higher linearity and efficiency [10][11][12][13][14][15]. However, a complete experimental validation of both benefits and drawbacks induced by their application on a DPA is not yet reported in literature.…”

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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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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“…To solve this problem, PA linearisation techniques aiming at extending the PA linear range and the PAPR reduction such as clipping, Selective Mapping [5] and Crest Factor Redcution (CFR) [6] have been investigated in previous years respectively. The PA linearisation methods includes predistortion methods and PA improvement methods [7–9].…”

Section: Introductionmentioning

confidence: 99%

Distortion‐characteristic estimation predistorter for high efficiency power amplifiers

Ren

Chen

2016

IET signal process.

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Power amplifier (PA) is one of important components in wireless communication system. However, its non‐linear and memory characteristic cause harmful distortion, which significantly decreases the power efficiency and wastes electronic energy since the power of PA needs back off. To overcome the non‐linear and memory problems, a novel method based on distortion‐characteristic estimation algorithm is developed in this study. The main innovation of this study is manifested in two aspects: first, the authors use well designed training signals to estimate the distortion characteristic of the PA; second, a novel PA characteristic estimation algorithm is developed in order to calculate the optimal state of the ideal predistorter that behaves like the inverse characteristic of PA theoretically. Since this novel method does not require the error between original signals and feedback signals, it can avoid the significant errors caused by the time mismatch between source signals and feedback signals, and can increase the power efficiency of the PA. The simulation results validate the performance increase and the synchronisation‐error immunity over the existing simplified filter look up table method.

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A Crest Factor Reduction Method in Digital Predistortion for Improvement of Power Efficiency

Cited by 6 publications

References 3 publications

Modified Output Combining 3-Stage Doherty Power Amplifier Design for LTE Micro eNodeB

Modified Output Combining 3-Stage Doherty Power Amplifier Design for LTE Micro eNodeB

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

Distortion‐characteristic estimation predistorter for high efficiency power amplifiers

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