Truly wideband linearization

Katz, A.; Gray, Robert; Dorval, Roger

doi:10.1109/mmm.2009.934688

Cited by 24 publications

(9 citation statements)

References 8 publications

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“…(2). The model presents nonlinear models of TWT amplifiers that are based on a simple two-parameter formula for each of the four aforementioned functions.…”

Section: The Analysis and Compensation Of The Twta Nonlinearitymentioning

confidence: 99%

“…To compensate these nonlinear distortions, many linearization techniques have been proposed, such as feedback, analog predistortion, feedforward, baseband digital predistortion. Among these technique such as baseband prediction, Practical DSP-based linearization systems of baseband predistortion can give a satisfactory IMD correction, but it is hard to reach bandwidth over 100MHz because of its complexity, cost, power consumption, and availability of required DSP components [2], [3]. The feedforward technique is too complex to implement on satellite.…”

Section: Introductionmentioning

confidence: 99%

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New Broadband Predistortion Linearizer Using Balanced Circuits Structure for Satellite TWTAs

2016

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Abstract. The power amplifies is a key component influencing the power efficiency of communication system. The travelling wave tube is widely used in satellite system because of its high efficiency, apposite weight and broadband characteristic, but its strong nonlinear characteristic generates intermodulation distortion, which degrades the data quality of transmitted signal and causes interference in adjacent channels. The analogue predistortion structure using Schottky diodes could improve the linearity well, but parasite element in the Linearizer limits predistortion broadband, reluctant to satisfy the growing high volume data transmission requirement. This paper presents a new balanced structure of Linearizer for the travelling wave tube amplifier. We have analyzed the model of linearizer and the TWTA and used to calculate the intermodulation distortion and optimize the Linearizer nonlinear expansion characteristic. A frequency bandwidth of 1.2 GHz Linearizer has been demonstrated with a K-band TWTA between 19.8 and 21.0 GHz. The measurement result shows that the linearizer delivers about 2~6dB of gain expansion and 20~60 degrees phase shift expansion, and the cascaded LTWTA shows good linearity improvement of 17.8dB at 6dB input power back off point.

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“…(2). The model presents nonlinear models of TWT amplifiers that are based on a simple two-parameter formula for each of the four aforementioned functions.…”

Section: The Analysis and Compensation Of The Twta Nonlinearitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New Broadband Predistortion Linearizer Using Balanced Circuits Structure for Satellite TWTAs

2016

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“…The dataflow node for computing polynomials reads samples coming from the transmitter baseband through an input FIFO and computes the polynomial basis functions using equations (1) and (2). The polynomial weights (u k,p ) are assumed to be precomputed, and since only odd polynomial orders are used, computation of | | does not require square root computations.…”

Section: Polynomial Computationmentioning

confidence: 99%

“…However, these direct conversion transceivers have several imperfections arising from the nonlinearities and non-ideal behavior of analog RF and digital baseband transceiver components. Moreover, power-constrained mobile transmitters drive their transmit power amplifiers close to their saturation regions [2], which results in nonlinear intermodulation distortion that is especially harmful in multi-cluster and carrier aggregation (CA) transmission scenarios [3].…”

Section: Introductionmentioning

confidence: 99%

Low power implementation of digital predistortion filter on a heterogeneous application specific multiprocessor

Ghazi

Boutellier

Abdelaziz

et al. 2014

2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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Power-constrained mobile radio communication transmitters drive their transmit power amplifiers close to their saturation regions, which results in nonlinear intermodulation distortion that is especially harmful in multi-cluster and carrier aggregation transmission scenarios. Digital predistortion is a method for linearizing the transmitter and suppressing the most harmful spurious emissions at the transmitter power amplifier output. This paper describes a programmable implementation of a digital predistortion filter on a heterogeneous Transport Trigger Architecture (TTA) multiprocessor. The predistortion algorithm is based on a parallel Hammerstein polynomial model and the experimental results show that the proposed programmable architecture is capable of linearizing a 20 MHz LTE carrier in realtime with a power consumption that is suitable for mobile devices.

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“…Two types of linearization techniques had been mainly proposed and demonstrated for wireless/microwave transmission: analog and digital predistortion circuits. Digital linearization has been very popular currently for wireless/microwave communications [1], leading to more than 20 dB improvement of spur free dynamic range (SFDR). However, digital linearization is limited to 100 MHz in bandwidth, and typically 20 MHz for wireless communications [1].…”

Section: Introductionmentioning

confidence: 99%

Review of linearization techniques for fiber-wireless systems

Zhang

Shen

Liu

2014

2014 IEEE International Wireless Symposium (IWS 2014)

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Optical and electrical linearization techniques are reviewed for broadband radio over fiber transmission. The optical linearization includes optical mixed polarization and two-wavelength linearization, and the electrical linearization includes analog pre-distortion circuit. The optical linearization leads to more than 10-dB improvement of spur-free dynamic range (SFDR). The analog predistortion circuit that is simple and of low-cost results in about 10 dB improvement of SFDR.Index Terms -RF photonics, radio over fiber, linearization, wireless access networks.

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Truly wideband linearization

Cited by 24 publications

References 8 publications

New Broadband Predistortion Linearizer Using Balanced Circuits Structure for Satellite TWTAs

New Broadband Predistortion Linearizer Using Balanced Circuits Structure for Satellite TWTAs

Low power implementation of digital predistortion filter on a heterogeneous application specific multiprocessor

Review of linearization techniques for fiber-wireless systems

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