Novel Technique for Wideband Digital Predistortion of Power Amplifiers With an Under-Sampling ADC

Liu, Youjiang; Yan, Jonmei J.; Dabag, Hayg-Taniel; Asbeck, P.M.

doi:10.1109/tmtt.2014.2360398

Cited by 59 publications

(28 citation statements)

References 18 publications

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“…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.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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 this case also, the sampling rate limitation of the feedback path is a serious challenge that needs to be addressed. Thus, it is essential to 20], an under-sampling restoration DPD (USR-DPD) was introduced. The USR-DPD uses an iterative approach to synthesize the predistortion function.…”

Section: Introductionmentioning

confidence: 99%

“…In [19], a spectral extrapolation technique was proposed to extend the correction bandwidth of DPD by means of computationally intensive signal processing algorithms. In [20], an under-sampling restoration DPD (USR-DPD) was introduced. The USR-DPD uses an iterative approach to synthesize the predistortion function.…”

mentioning

confidence: 99%

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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“…There are two possible answers: direct RF-ADC converters operating at GHz sampling-rate or using low-rate ADC with additional recovering algorithms. Research into extending the DPD bandwidth by means of recovering high-rate feedback signal from an under-sampled signal is very active recently [1], [2], [3]. However, many issues arise by employing these methods.…”

Section: Introductionmentioning

confidence: 99%

Generalised digital predistortion of RF power amplifiers with low-rate feedback signal

Wang

Ibrahim

Han

et al. 2016

2016 46th European Microwave Conference (EuMC)

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Abstract-Assuming there is an infinite periodically sinusoidal signal x with known frequency, one can sample x at Nyquist zone or sampling-rate to recover the signal. In terms of digital predistortion (DPD) with modulated signal as input, this paper will show the same concept that theoretically one can sample the feedback signal at arbitrary sampling rate to obtain the same coefficient of DPD or behavioural models as the one calculated from the high sampling rate feedback signal. The performance of a generalised DPD technique using a traditional memory polynomial with low-rate analog-to-digital device(ADC) is experimentally validated. The NMSE and ACPR results indicate the same performance by using an ADC sampling from 100 MHz to 10 MHz.

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Novel Technique for Wideband Digital Predistortion of Power Amplifiers With an Under-Sampling ADC

Cited by 59 publications

References 18 publications

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

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

Generalised digital predistortion of RF power amplifiers with low-rate feedback signal

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