A Technique to Extend the Bandwidth of an RF Power Amplifier Test Bed

“…Other research in this area includes subsampling techniques in the presence of periodic signals [2], as well as complex modulated signals [3], frequency stitching [4] and undersampling restoration digital pre-distortion (USR-DPD) [5]. One of the disadvantages of these techniques is the increased signal processing required.…”

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confidence: 99%

Experimental testbed for PA characterization and pre-distortion with relaxed sampling rate requirements

Bagot

Smida

Hammi

2017

2017 89th ARFTG Microwave Measurement Conference (ARFTG)

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“…In a PA characterization context, the testing signal is known and remains constant in terms of its statistics. This results in a stable PA response [17]. Exploiting this characteristic of PAs, the proposed technique is based on generating several copies of the input signal, and concatenating them with appropriate delay in order to result in a synthetic test signal.…”

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confidence: 99%

“…4, pp. 1488-1494, Aug. 2007 C. Yu, L. Guan, E. Zhu, and A. Zhu, "Band-limited Volterra seriesbased digital predistortion for wideband RF power amplifiers," IEEE Trans. Microw.…”

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confidence: 99%

“…Though, it is not suitable for wideband systems involving contiguous carrier aggregation. The frequency stitching technique proposed by Wissel et al in [17] provides wideband PA characterization by manipulating measurement data in the frequency domain leading to relatively complex signal processing. Other approaches have been proposed to extend the bandwidth of digital predistortion systems [18]- [21].…”

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confidence: 99%

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Extending the Characterization Bandwidth of Dynamic Nonlinear Transmitters With Application to Digital Predistortion

Bensmida

Hammi

Kwan

et al. 2016

IEEE Trans. Microwave Theory Techn.

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Abstract-This paper reports a new measurement method for wideband radiofrequency power amplifier characterization and digital predistortion. The proposed measurement procedure relaxes significantly the sampling rate requirement on the analog to digital converters of the feedback path. Successful PA linearizations were achieved in the presence of 20 MHz, 40 MHz, and 60 MHz LTE-A signals using a vector signal analyzer with sampling speeds equal to only 24 Msps, 40.96 Msps, and 61.44 Msps, respectively. Despite these very low sampling rates, a quasi perfect cancellation of the PA distortions was achieved (more than 50 dBc in terms of ACLR), in all tests, over bandwidths including up to fifth order intermodulation distortions. Such correction bandwidth is much wider than the observation bandwidths associated with the receiver sampling rates.Index Terms-Digital predistortion, dynamic distortions, LTEadvanced, memory effects, power amplifier, vector signal analysis, wideband. I. INTRODUCTIONODERN and future wireless communication systems provide high data rate capability. For this reason, transmitter architectures evolved to accommodate complex modulation schemes with high spectral efficiency. These architectures are designed to ensure the transmission of Manuscript submitted January 13, 2015, re-submitted July 27, 2015, revised December 5, 2015, revised February 7, 2016, revised June 21, 2016. This work was supported by the University of Bristol and King Fahd University of Petroleum and Minerals (KFUPM). The work of the iRadio Laboratory was supported mainly by Alberta Innovates -Technology Futures (AITF), Canada Research Chair (CRC) Program, and Natural Science and Engineering Council of Canada (NSERC).S. Bensmida and K.A. Morris are with are with the Communications Systems and Networks Group, University of Bristol, Bristol BS8 1UB, U.K. (e-mail: {s.bensmida, Kevin.Morris}@bristol.ac.uk).O. Hammi is with the Department of Electrical Engineering, American University of Sharjah, Sharjah, United Arab Emirates (e-mail: ohammi@ieee.org)A. Kwan and F.M. Ghannouchi are with the iRadio Laboratory, Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada (e-mail: {akckwan, fadhel.ghannouchi}@ucalgary.ca).M.S. Sharawi is with the Department of Electrical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia (e-mail: msharawi@kfupm.edu.sa).wideband signals in a linear manner. Any nonlinear behavior in the transmitter will distort the transmitted signal and hence corrupt the transmitted data. Radio frequency power amplifiers (RFPAs) are the most nonlinear and power consuming blocks in a transmitter's architecture. Therefore, special measures are taken to increase an RFPA linearity and efficiency. Significant research efforts have led to highly efficient RFPA architectures [1]- [7]. These architectures require linearization procedures to ensure compliance with the mandatory and well regulated linearity requirements of...

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A Technique to Extend the Bandwidth of an RF Power Amplifier Test Bed

Cited by 35 publications

References 7 publications

Noise impact on the identification of digital predistorter parameters in the indirect learning architecture

Noise impact on the identification of digital predistorter parameters in the indirect learning architecture

Experimental testbed for PA characterization and pre-distortion with relaxed sampling rate requirements

Extending the Characterization Bandwidth of Dynamic Nonlinear Transmitters With Application to Digital Predistortion

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