Systematic Crest Factor Reduction and Efficiency Enhancement of Dual-Band Power Amplifier Based Transmitters

Chen, Xiaofan; Chen, Wenhua; Huang, Fei; Ghannouchi, Fadhel M.; Feng, Zhenghe; Liu, Yuanan

doi:10.1109/tbc.2016.2619584

Cited by 14 publications

(15 citation statements)

References 20 publications

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“…Wireless communications systems have different standards and requirements where each standard can use a certain frequency band. At the same time, mobile communication systems are being developed where the data rate is one of the main targets for each generation; the growth of data rate requires a complex modulation and more bandwidth [11][12][13][14][15]. However, due to the crowded spectrum, the upcoming generation may use more frequency bands in order to fulfil the targeted requirements (e.g., 5G spectrum consists of three bands are 700 MHz, 3.6 GHz and 26 GHz) [16], in this case, the devices of the new generation should be designed to deal with these frequency bands in addition to the compatibility with the previous mobile generations.…”

Section: Dual-band Doherty Power Amplifiermentioning

confidence: 99%

“…Also, new terms have entered the communications systems which are multi-band and multi-mode, where the term "multi-band" refers to a transmitter which works on two different frequency bands simultaneously; in this case, the number of devices, size, and cost will be reduced. On the other hand, the term "multi-mode" refers to a transmitter who can support and combine different access technologies such as 2G, 3G, 4G and 5G on a single platform [8][9][10][11][12][13]. To design a dual-band power amplifier, a hybrid configuration can be used but occupies a large area.…”

Section: Introductionmentioning

confidence: 99%

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Recent Developments of Dual-Band Doherty Power Amplifiers for Upcoming Mobile Communications Systems

Abdulkhaleq

Yahya

McEwan³

et al. 2019

Electronics

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Power amplifiers in modern and future communications should be able to handle different modulation standards at different frequency bands, and in addition, to be compatible with the previous generations. This paper reviews the recent design techniques that have been used to operate dual-band amplifiers and in particular the Doherty amplifiers. Special attention is focused on the design methodologies used for power splitters, phase compensation networks, impedance inverter networks and impedance transformer networks of such power amplifier. The most important materials of the dual-band Doherty amplifier are highlighted and surveyed. The main problems and challenges covering dual-band design concepts are presented and discussed. In addition, improvement techniques to enhance such operations are also exploited. The study shows that the transistor parasitic has a great impact in the design of a dual-band amplifier, and reduction of the transforming ratio of the inverter simplifies the dual-band design. The offset line can be functionally replaced by a Π-network in dual-band design rather than T-network.

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Section: Dual-band Doherty Power Amplifiermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recent Developments of Dual-Band Doherty Power Amplifiers for Upcoming Mobile Communications Systems

Abdulkhaleq

Yahya

McEwan³

et al. 2019

Electronics

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“…Practically, the PA must not clip the signal peaks, meaning that the maximum output power of the PA must be around PAPR times larger than the average one. Crest-reduction techniques [11][12][13] can be applied to partially overcome this limit, at the cost of an increased non-linear behaviour. Figure 2 reports the efficiency of a conventional Class-AB PA along with the probability density functions of three different modulated signal, as a function of Output power Back-Off (OBO), which is the amount of output power reduction with respect to the maximum.…”

Section: Power Amplifier Design Challengesmentioning

confidence: 99%

“…All the HEPR enhancement solutions proposed so far proved to be able to handle PAPRs up to roughly 10 dB, which can be considered sufficient if used in conjunction with some digital Crest Factor Reduction (CFR) algorithm that reduces the peaks of the modulated waveform to limit its PAPR [11][12][13].…”

Section: Obomentioning

confidence: 99%

High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach

et al. 2017

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Abstract:Modern mobile communication signals require power amplifiers able to maintain very high efficiency in a wide range of output power levels, which is a major issue for classical power amplifier architectures. Following the load-modulation approach, efficiency enhancement is achieved by dynamically changing the amplifier load impedance as a function of the input power. In this paper, a review of the widely-adopted Doherty power amplifier and of the other load-modulation efficiency enhancement techniques is presented. The main theoretical aspects behind each method are introduced, and the most relevant practical implementations available in recent literature are reported and discussed.

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“…Numerous crest factor reduction (CFR) techniques have been studied to reduce the PAPR when DPD is used [14]- [16]. CFR is usually implemented as a correction to reduce signal peaks.…”

mentioning

confidence: 99%

A Joint Crest Factor Reduction and Digital Predistortion for Power Amplifiers Linearization Based on Clipping-and-Bank-Filtering

Wang

Roger

Sarrazin³

et al. 2020

IEEE Trans. Microwave Theory Techn.

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The power efficiency and the linearity of a power amplifier (PA) depend on its operating point. A high efficiency generally corresponds to poor linearity. To optimize the efficiency/linearity trade-off, crest factor reduction (CFR) techniques are classically implemented along with digital predistortion (DPD) to control the PA operating point. Joint CFR/DPD can be realized with a single model so that the running complexity of the CFR is negligible. This paper fully explores the clipping-andbank-filtering (CABF) method for joint CFR/DPD and extends it to the multi-carrier case with validation on experimental results. Compared with conventional approaches, it provides either better linearization performance or lower complexity at the same PA operating point. The study is completed with a discussion on the choice of windows in the filter bank. The proposed CABF-based joint CFR/DPD model is then experimentally evaluated on a test bench with two PAs using single-carrier and 2-carrier 20 MHz long term evolution (LTE) signals as the stimulus.

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Systematic Crest Factor Reduction and Efficiency Enhancement of Dual-Band Power Amplifier Based Transmitters

Cited by 14 publications

References 20 publications

Recent Developments of Dual-Band Doherty Power Amplifiers for Upcoming Mobile Communications Systems

Recent Developments of Dual-Band Doherty Power Amplifiers for Upcoming Mobile Communications Systems

High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach

A Joint Crest Factor Reduction and Digital Predistortion for Power Amplifiers Linearization Based on Clipping-and-Bank-Filtering

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