A novel adaptive predistortion technique for power amplifiers

Antonio, Franklin; Hamdy, W.; Heidmann, P.; Heizer, J.; Kasturi, Nitin; Osés, David; Riddle, C.

doi:10.1109/vetec.1999.780598

Cited by 12 publications

(3 citation statements)

References 1 publication

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“…In the predistortion method [1][2][3][4][5][6], a signal with distortion added beforehand is applied so that the amplitude and phase characteristics are the reverse of the AM/AM and AM/PM characteristics. In particular, the method of realizing the predistortion function by digital signal processing can reduce the equipment size, because the predistorter can be included in the transmitter, and thus the cost can be lowered while the efficiency is improved.…”

Section: Introductionmentioning

confidence: 99%

A digital predistorter for power amplifier with memory effect

Hongo

Miyatani

Okubo

et al. 2006

Electron. Comm. Jpn. Pt. I

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SUMMARYWhen a conventional predistorter compensating the nonlinear distortion in a power amplifier is used, the compensation characteristics deteriorate as the signal bandwidth is increased, to such a degree that the memory effect is no longer negligible. In this paper, it is shown experimentally that the memory effect is caused by fluctuations of the input voltage at low frequency. Measured data are introduced into the simulation. A predistorter that can deal with the memory effect is presented. It is shown by simulation and experiments that the distortion compensation characteristic can be improved.

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Section: Introductionmentioning

confidence: 99%

A digital predistorter for power amplifier with memory effect

Hongo

Miyatani

Okubo

et al. 2006

Electron. Comm. Jpn. Pt. I

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“…By setting a demodulator inside the circuit, distortion compensation data optimization can be strictly planned, and dealing with the aforementioned changes in characteristics becomes possible [5], [6]. A method for updating distortion compensation data was also investigated in which no demodulator is used in the feedback circuit; it focuses on the spectrum distortion emission of the transmission signal [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Simple adaptive baseband predistortion algorithm with perturbation

Nakamura

Watanabe

Maruyama

2004

2004 IEEE Wireless Communications and Networking Conference (IEEE Cat. No.04TH8733)

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This paper proposes a simple algorithm for controlling baseband predistortion in quasi-millimeter wave Fixed Wireless Access (FWA) systems. This algorithm selects the optimal distortion compensation data from multiple sets of distortion compensation data in order to reduce the detected outband emission power. This algorithm has features that prevent severe degradation even though it does not use the strict distortion compensation data update method. The effectiveness of the proposed algorithm is verified by a simulation that uses 64QAM as the modulation scheme; the saturated output power of the AM-AM characteristics is 0.5 dB, the degree of phase shift for the AM-PM characteristic is 5%, and 6 dB back off is used. The simulation results show that the degradation in characteristics based on distortion calculated as distortion compensation data error is approximately 0.

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“…However, the distortion compensation is degraded by change of the amplifier characteristics. In order to resolve this problem, adaptive control methods have been proposed to keep optimum compensation for the changing amplifier characteristics [2][3][4]. Usually, feedforward methods have been used in cellular base stations.…”

Section: Introductionmentioning

confidence: 99%

Performance of an adaptive predistorted power amplifier with peak limited baseband code‐division multiplexed signal

Mizuta¹,

Kawaguchi²,

Akaiwa³

2003

Electron. Comm. Jpn. Pt. I

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SUMMARYIn FDM and CDM systems, the peak-to-average power ratio (PAPR) increases as the number of signals to be multiplexed is increased. When a signal with a large PAPR is incident on a power amplifier, either the out-ofband radiation is increased or the power efficiency is degraded. Methods of resolving these problems are nonlinear distortion compensation techniques, one of which is the predistorter. Another conceivable solution is to suppress the PAPR of the input signal. In this paper, we first study the performance when a limiter is used for the CDM signal in the baseband. By computer simulation, it is shown that the PAPR is suppressed by using a limiter and that the deterioration of the SIR performance is small if the PAPR is more than 6 dB. Next, the characteristics are studied by numerical simulation when a CDM signal with a limiter in the baseband is input to an adaptive predistorter-type distortioncompensated power amplifier. By combining the CDM signal with a limiter in the baseband and the adaptive predistorter-type distortion-compensated power amplifier, it is possible to suppress the out-of-band radiated power and simultaneously increase the power efficiency.

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A novel adaptive predistortion technique for power amplifiers

Cited by 12 publications

References 1 publication

A digital predistorter for power amplifier with memory effect

A digital predistorter for power amplifier with memory effect

Simple adaptive baseband predistortion algorithm with perturbation

Performance of an adaptive predistorted power amplifier with peak limited baseband code‐division multiplexed signal

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