Fully orthogonal multi-carrier predistortion linearization for RF power amplifiers

Yang, Xi; Roblin, Patrick; Chaillot, D.; Mutha, Shashank; Strahler, Jeff; Kim, Jiwoo; Ismail, Mohammed; Wood, John; Volakis, John L.

doi:10.1109/mwsym.2009.5165887

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…The fifth-order intermodulation introduces additional spurious bands at and . In [3] and [4], an orthogonal two-band frequency-selective linearization scheme was introduced and demonstrated. In that algorithm, the linearization of an amplifier with third-order nonlinearities relied on six complex coefficients to compensate for the in-band and interband (IMD) distortion independently.…”

Section: A Two-band Casementioning

confidence: 99%

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A Generalized Architecture for the Frequency- Selective Digital Predistortion Linearization Technique

Kim

Roblin

Chaillot

et al. 2013

IEEE Trans. Microwave Theory Techn.

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Abstract-This paper presents a new architecture for the frequency-selective digital predistortion (DPD) for two-and three-band power amplifier (PA) linearization. Also, largely spaced-signal DPD using a digital intermediate frequency (IF) technique is demonstrated. The algorithm used accounts for differential memory effects up to fifth order for bands that can be arbitrarily spaced. The simulation and experimental studies are performed using various signal sets; two-and three-band multitone signals with various tone spacing, band separation, and complementary cumulative distribution function. An improvement of 10 dB over third-order linearization is demonstrated in simulation for more than 20 dB of adjacent channel power ratio reduction. The test signal and the linearization algorithm were implemented on a field-programmable gate array. The linearization algorithm was applied to an RF amplifier at 700-900 MHz. For the two-band case, more than 15 dB on the in-band, 13 dB on the third, and 5 dB on the fifth intermodulation distortion (IMD) cancellation were achieved. For the three-band case, more than 12 dB of IMD cancellation was observed. For largely spaced signal DPD, more than 15 dB of IMD cancellation was achieved. In the three-band case, the linearization of intermodulation byproducts overlapping with the in-band distortion is found to be of critical importance.Index Terms-Digital predistortion (DPD), memory effect, multiband linearization, power amplifier (PA).

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Section: A Two-band Casementioning

confidence: 99%

“…In [4], an incremental progress was reported, in which an orthogonal condition was added to the algorithm. With this feature, the in-band and interband linearization could be successfully tuned independently.…”

mentioning

confidence: 99%

A Generalized Architecture for the Frequency- Selective Digital Predistortion Linearization Technique

Kim

Roblin

Chaillot

et al. 2013

IEEE Trans. Microwave Theory Techn.

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“…A significant body of research exists on pre-distortion techniques developed for multi-carrier aggregate signals [7]- [10]. These techniques, most of which are based upon stochastic averages of signal ensembles, are less relevant to this work due to the easier ability to proactively sculpt singlecarrier waveforms through pre-distortion techniques.…”

Section: Introductionmentioning

confidence: 99%

Evaluating HPA Effects on Chaotic Sequence Spread Spectrum Detectability

Bowler,

Michaels

2023

IEEE Access

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Digital chaotic sequence spread spectrum (CSSS) communication systems provide a number of advantages for secure communications due to the apparent bandlimited Gaussian noise-like signal characteristics and the non-repeating nature of the underlying chipping sequence. The Rayleigh magnitude distribution of the signal represents a challenge, however, for transmission through linear highpower amplifiers (HPA), both due to the high peak-to-average power ratio (PAPR) and the impacts of selective signal compression on the tails of the time-domain Gaussian signals, which becomes observable by cyclostationary low probability of detection (LPD) metrics. This paper first provides an analysis of HPA compression effects on a single-carrier CSSS signal to understand the HPA-induced artifacts when pushed into compression. This work also defines and evaluates time-domain pre-distortion techniques for memoryless HPAs, validating those formulations through Matlab simulations and live measurements of predistorted CSSS signals transmitted through physical HPAs. Unlike computationally expensive statistical models used to predistort multi-carrier waveforms, this technique is shown to be a computationally efficient method to minimize the increased likelihood of adversarial detection of single-carrier waveforms. The proposed pre-distortion techniques are measured as achieving an average of 3.35 dB in improvements for linear operating range, enabling transmission of CSSS waveforms at an HPA backoff of 4.80 dB without adversely affecting kurtosis-based signal detectability.

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A new architecture for frequency-selective digital predistortion linearization for RF power amplifiers

Kim

Roblin

Yang

et al. 2012

2012 IEEE/MTT-S International Microwave Symposium Digest

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Fully orthogonal multi-carrier predistortion linearization for RF power amplifiers

Cited by 4 publications

References 4 publications

A Generalized Architecture for the Frequency- Selective Digital Predistortion Linearization Technique

A Generalized Architecture for the Frequency- Selective Digital Predistortion Linearization Technique

Evaluating HPA Effects on Chaotic Sequence Spread Spectrum Detectability

A new architecture for frequency-selective digital predistortion linearization for RF power amplifiers

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