On linearisation of microwave-transmitter solid-state power amplifiers

O’Dróma, Máirtín; Bertrán, E.; Portilla, J.; Mgebrishvili, N.; Guerrieri, Simona Donati; Montoro, Gabriel; Brazil, T.J.; Magerl, Gottfried

doi:10.1002/mmce.20114

Cited by 12 publications

(6 citation statements)

References 20 publications

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“…The second approach is to use a linearization technique such as predistortion, feed-forward (FF), feedback, and envelope elimination and restoration approaches [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In the first approach, the amplifier is operated at a point further in the linear region, or equivalently, a point with a large power input back-off (IBO).…”

Section: Introductionmentioning

confidence: 99%

“…Although this approach reduces the nonlinear effects substantially, it comes at the expense of decreased power efficiency, which is unfavorable. The second approach is to use a linearization technique such as predistortion, feed-forward (FF), feedback, and envelope elimination and restoration approaches [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Out of these techniques, FF linearization has been the most attractive approach in OFDM systems because of the wideband nature of the analog circuitry used in manipulating the signals in the FF implementation [21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

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Performance of feed‐forward linearizers of power amplifiers in OFDM systems under complex gain errors

Gharaibeh

Al-Zayed

2015

Int J Communication

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Adaptive feed-forward (FF) linearization schemes of power amplifiers provide high distortion cancelation and adjacent channel power ratio (ACPR) reduction. However, FF schemes are very sensitive to imbalances in the circuit parameters used to achieve signal cancelation. In this paper, an FF linearization circuit is analyzed using the orthogonalization of the nonlinear model and considering the effects of complex gain errors in the signal and distortion cancelation loops on the overall performance of the FF linearizer. The analysis enables the effective signal-to-distortion ratio (SDR) and ACPR to be estimated from FF circuit model. It is shown that complex gain errors in the distortion cancelation loop have a more significant effect on in-band distortion than out-of-band distortion, which means that the design of FF linearizers based on ACPR improvement is not optimal.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance of feed‐forward linearizers of power amplifiers in OFDM systems under complex gain errors

Gharaibeh

Al-Zayed

2015

Int J Communication

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“…Performances can be improved by adding a feedback control to deal with external perturbations, parameter variations or operating frequency modifications. Design of conventional feedback requires considering carefully performances in term of gain-bandwidth product and stability [14][15] [16]. The nonlinear IMC is an alternative solution using a model of the nonlinear system to be controlled [17].…”

Section: Introductionmentioning

confidence: 99%

Linearization of radio frequency amplifiers using nonlinear Internal Model Control method

Bachir

Duvanaud

2011

AEU - International Journal of Electronics and Communications

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In the present paper, the nonlinear Internal Model Control (IMC) method is introduced and applied to linearize high frequency Power Amplifiers (PAs). The IMC is based on the description of a process model and of a controller. It is shown that baseband frequency descriptions are suitable for the model and the controller. Their description parameters are derived from input and output modulation signals processed in Cartesian form. Simulation results are given to illustrate the design procedure and to demonstrate the performances of the IMC linearizer.

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“…Efficiency of a power amplifier (PA) is boosted by setting the bias close to its saturation, therein, significant nonlinear distortions occur, thus, linearization techniques that suppress such undesired distortions is obligatory. Because of the availability of the fast digital signal processor, digital predistortion (DPD) has become the most important linearization technique for commercial base station transmitters [1].…”

Section: Introductionmentioning

confidence: 99%

An open-loop digital predistorter based on memory polynomial inverses for linearization of RF power amplifier

Akaiwa

et al. 2011

Int J RF and Microwave Comp Aid Eng

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Digital Predistorter is a cost-effective solution to compensate for the nonlinear distortions appearing in the RF power amplifiers (PAs). The indirect learning scheme is widely implemented because of its flexibility to eliminate the requirement for building a closed-loop real time system, which dramatically reduces the complexity for measurement setup. However, such scheme is sensitive to the measurement noise that may cause biasing in the coefficients estimation. To minimize the influence of measurement noise and simultaneously enable the open-loop implementation, we propose a predistortion technique that first model the PA and then generates predistorted signal iteratively through a feedback configured structure to avoid using the noisy signal when performing the inverse model estimation. Unlike the indirect learning which estimates the postinverse of the PA, our predistortion is based on the preinverse of the PA. Both simulations and measurements show that utilizing the proposed predistortion can obtain adjacent channel power ratio (ACPR) improvement in wideband code division multiple access (WCDMA) signal test compared with the conventional memory polynomial predistortion based on indirect learning.

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On linearisation of microwave-transmitter solid-state power amplifiers

Cited by 12 publications

References 20 publications

Performance of feed‐forward linearizers of power amplifiers in OFDM systems under complex gain errors

Performance of feed‐forward linearizers of power amplifiers in OFDM systems under complex gain errors

Linearization of radio frequency amplifiers using nonlinear Internal Model Control method

An open-loop digital predistorter based on memory polynomial inverses for linearization of RF power amplifier

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