A Fast Digital Predistortion Algorithm for Radio-Frequency Power Amplifier Linearization With Loop Delay Compensation

Li, Hao; Kwon, Dong-Hee; Chen, Deming; Chiu, Yun

doi:10.1109/jstsp.2009.2020562

Cited by 45 publications

(23 citation statements)

References 21 publications

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“…In Fig.2, where H[.] represents the transform function of predistortion, the LMS algorithm [8]which estimates the LUT can be expressed as formula (8) and (9).…”

Section: B Digital Baseband Pre-distortion Lookup Tablementioning

confidence: 99%

Improved Technique of PAPR Reduction Combined Pre-distortion in OFDM Systems

Luo¹,

Jian²

2014

Proceedings of the 3rd International Conference on Computer Science and Service System

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Abstract-Orthogonal Frequency Division Multiplexing(OFDM) is an effective parallel multi-carrier transmission scheme. However, this technique has one weakness of a higher transmission signal Peak to Average Power Ratio (PAPR) when the signal is transmitted. To reduce the impact of High Power Amplifier (HPA) nonlinearity on OFDM system, this paper proposes the combination of improved clipping and filtering method and based on digital pre-distortion lookup table reduce the peak to average ratio of OFDM and improve the BER performance of the power amplifier in pre-distortion system and the effectiveness of HPA. The simulation results show there is a certain relationship between the PAPR reduction techniques and HPA linearization techniques.

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“…In Fig.2, where H[.] represents the transform function of predistortion, the LMS algorithm [8]which estimates the LUT can be expressed as formula (8) and (9).…”

Section: B Digital Baseband Pre-distortion Lookup Tablementioning

confidence: 99%

Improved Technique of PAPR Reduction Combined Pre-distortion in OFDM Systems

Luo¹,

Jian²

2014

Proceedings of the 3rd International Conference on Computer Science and Service System

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“…In this section, we compare the implementation complexity of fractional delay estimation of our scheme in frequency domain with that proposed in [3]. The scheme in [3] utilizes a 4-tap FIR interpolation filter with a modified Farrow structure in time domain.…”

Section: Implementation Complexitymentioning

confidence: 99%

“…The scheme in [3] utilizes a 4-tap FIR interpolation filter with a modified Farrow structure in time domain. Table I compares the implementation complexity of these two methods when implemented on a Vitex4 Xilinx FPGA (V4SX55).…”

Section: Implementation Complexitymentioning

confidence: 99%

“…In [2] delay estimation is performed using a covariance-based algorithm, and Lagrange interpolation is adopted to increase the sample rate by 20-30 times of initial sample rate. In [3] a time domain fractional delay estimation, based on 4-tap FIR interpolation filter with a modified Farrow structure, is introduced.…”

Section: Introductionmentioning

confidence: 99%

“…The frequency domain predistorter reduces the required back-off (difference between the average output signal power and 1 dB compression point of PA, P1 dB) at power amplifier output by about 3.5 dB. Also, a simple scheme for fractional delay estimation in OFDM systems is proposed, which has a lower hardware complexity compared to that in [3]. Fig.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Digital predistortion based on frequency domain estimation for OFDM systems with low complexity loop delay compensation

Rahmanian

Nabavi

2012

IEICE Electron. Express

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Digital predistortion is an efficient and robust technique for improving the linearity of power amplifiers. In this paper, we propose a digital predistorter based on frequency domain for OFDM signals, which exhibits superior accuracy against the predistortion in time domain. Simulation results show that, the desired MER can be achieved with fractional delay error as large as 6% of sampling time. It is also shown that since in frequency domain a fractional delay translates to phase rotation, phase rotation estimation and compensation can be performed by a low complexity scheme.

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A low complexity loop‐delay estimation algorithm based on sliding window for power amplifier characterization

Peng

Lv²,

Yang

et al. 2023

Micro & Optical Tech Letters

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It is well known that accurate estimation of the loop delay between the input and output feedback signals is the key to behavioral modeling and digital predistortion of power amplifier. Nevertheless, most of the traditional loopdelay compensation algorithms have the disadvantage of high computational complexity. For the purpose of solving this problem, a loop-delay estimation algorithm based on sliding window has been proposed in this paper, where the first derivative characteristic of the signal is employed to evaluate the correlation between the input and output feedback signals. The simulation and experiment are carried out with different bandwidth signals in this paper. The results show that the proposed algorithm and the traditional cross-correlation-based method could align the input and output feedback signals successfully. But in terms of resource consumption, the proposed algorithm could reduce the multiplier nearly by 100% and the adder by approximately 93.2%.

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A Fast Digital Predistortion Algorithm for Radio-Frequency Power Amplifier Linearization With Loop Delay Compensation

Cited by 45 publications

References 21 publications

Improved Technique of PAPR Reduction Combined Pre-distortion in OFDM Systems

Improved Technique of PAPR Reduction Combined Pre-distortion in OFDM Systems

Digital predistortion based on frequency domain estimation for OFDM systems with low complexity loop delay compensation

A low complexity loop‐delay estimation algorithm based on sliding window for power amplifier characterization

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