Analytical prediction of spectral regrowth and correlated and uncorrelated distortion in multicarrier wireless transmitters exhibiting memory effects

Boulejfen, Noureddine; Harguem, A.; Hammi, Oualid; Ghannouchi, Fadhel M.; Gharsallah, Ali

doi:10.1049/iet-map.2008.0401

Cited by 10 publications

(4 citation statements)

References 8 publications

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“…The adjacent channel power ratio (ACPR) is also a crucial metric that needs attention when a modulated signal is used as the input for the PA [ 45 ]. The ACPR values typically depend on the application of the wireless communication.…”

Section: Performance Metrics Of Cmos Power Amplifiermentioning

confidence: 99%

A State-of-the-Art Review on CMOS Radio Frequency Power Amplifiers for Wireless Communication Systems

et al. 2023

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Wireless communication systems have undergone significant development in recent years, particularly with the transition from fourth generation (4G) to fifth generation (5G). As the number of wireless devices and mobile data usage increase, there is a growing need for enhancements and upgrades to the current wireless communication systems. CMOS transceivers are increasingly being explored to meet the requirements of the latest wireless communication protocols and applications while achieving the goal of system-on-chip (SoC). The radio frequency power amplifier (RFPA) in a CMOS transmitter plays a crucial role in amplifying RF signals and transmitting them from the antenna. This state-of-the-art review paper presents a concise discussion of the performance metrics that are important for designing a CMOS PA, followed by an overview of the trending research on CMOS PA techniques that focuses on efficiency, linearity, and bandwidth enhancement.

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Section: Performance Metrics Of Cmos Power Amplifiermentioning

confidence: 99%

A State-of-the-Art Review on CMOS Radio Frequency Power Amplifiers for Wireless Communication Systems

et al. 2023

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“…The necessary periphery ratios, (25), and corresponding maximum conduction angles, (23), for proper Doherty operation are summarized in Table 1 for different load modulation regions. The efficiency characteristic of the ADPA with appropriate periphery ratio devices can be observed by using the efficiency equation given in (15).…”

Section: Analysis and Design Optimization Of Adpamentioning

confidence: 99%

“…The drain bias has been provided at the end of λ/4 length stub that was shortened by using decoupling capacitors in order to reduce the memory effect as well [23]. The memory effects on PAs are spectral re-growth, IMD asymmetry and BW dependent IMD characteristics [24,25]. In an ideal Doherty operation, in-phase power combination at the end point is easily achieved by using simple λ/4 delay line prior to PPA.…”

Section: Experimental Validation Of Ba-dpa and Adpamentioning

confidence: 99%

Analysis, Design Optimization and Performance Comparison of Bias Adapted and Asymmetrical Doherty Power Amplifiers

Sahan¹,

Demır²

2013

PIER B

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Doherty type Power Amplifier (DPA) design is one of the most practical efficiency enhancement methods that provide moderate linearity. Asymmetrical device usage and employment of bias adaptation are among the most commonly used Doherty architectures in recent applications. In this paper, the efficiency performances of bias adapted DPA and asymmetrical DPA are compared based on the efficiency expression that is derived in terms of the conduction angle. The efficiency of bias adapted DPA is analyzed in terms of conduction angle of the peaking device; various bias waveforms are proposed and their effects on enhanced efficiency performance are demonstrated. This paper also facilitates an approach to determine the required relative periphery of the peaking amplifier in order to have a fully load modulated asymmetrical DPA. Both DPA structures are designed and implemented at the output power of 50 dBm with nearly 60% drain efficiencies in 6 dB load modulation region. The measurements verify the better efficiency characteristics of the bias adapted DPA and asymmetric DPA in comparison to the conventional DPA. For the first time in the literature, as a fair comparison, the performances of asymmetrical DPA and bias adapted DPA are compared on the same platform and their advantages as well as drawbacks are demonstrated using measurement results.

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“…In this context, power amplifiers (PA) are critical elements of the transmitter system in aircraft communications in terms of energy and linearity. The use of new modulation schemes to increase spectral efficiency and data rates leads to strong envelope variations that make the signal sensitive to PA nonlinear characteristics [3][4][5][6]. These nonlinearities generate distortions in the signal band and cause spectral regrowths in the adjacent channels, considered as disturbances for the other users [7,8].…”

Section: Introductionmentioning

confidence: 99%

Adaptive digital predistortion based on Feedback–Wiener Model for aeronautical applications

Bouazza

Bachir

Pastore³

et al. 2023

Int. J. Microw. Wireless Technol.

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In this work, a new adaptive digital predistorter (DPD) is proposed to linearize radio frequency power amplifiers (PA). The DPD structure is composed of two sub-models. A Feedback–Wiener sub-model, describing the main inverse nonlinearities of the PA, combined with a second sub-model based on a memory polynomial (MP) model. The interest of this structure is that only the MP model is identified in real time to compensate deviations from the initial behavior and thus further improve the linearization. The identification architecture combines offline measurement and online parameter estimation with small number of coefficients in the MP sub-model to track the changes in the PA characteristics. The proposed structure is used to linearize a class AB 75 W PA, designed by Telerad society for aeronautical communications in Ultra High Frequency (UHF) / Very High Frequency (VHF) bands. The obtained results, in terms of identification of optimal DPD and the performances of the digital processing, show a good trade-off between linearization performances and computational complexity.

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Analytical prediction of spectral regrowth and correlated and uncorrelated distortion in multicarrier wireless transmitters exhibiting memory effects

Cited by 10 publications

References 8 publications

A State-of-the-Art Review on CMOS Radio Frequency Power Amplifiers for Wireless Communication Systems

A State-of-the-Art Review on CMOS Radio Frequency Power Amplifiers for Wireless Communication Systems

Analysis, Design Optimization and Performance Comparison of Bias Adapted and Asymmetrical Doherty Power Amplifiers

Adaptive digital predistortion based on Feedback–Wiener Model for aeronautical applications

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