Predistortion With Low Feedback Sampling Rate for Wideband Nonlinear Satellite Downlinks

Liu, Zhijun; Hu, Xin; Liu, Ting; Chen, Rong; Li, Xiuhua; Wang, Weidong

doi:10.1109/lcomm.2019.2943318

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…With the increase of the transmitting power, nonlinear distortion is always introduced by imperfect devices in the FD link. A memory polynomial (MP) model is used to describe the nonlinearity [15], thus the SI with nonlinear distortion can be written as…”

Section: A Effect Of Nonlinear Distortionmentioning

confidence: 99%

A Time-Robust Digital Self-Interference Cancellation in Full-Duplex Radios: Receiver Design and Performance Analysis

Zhao

Guo

et al. 2020

IEEE Access

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In full-duplex radios, precise time synchronization between the received and reconstructed self-interference (SI) is the basis of the effective SI cancellation (SIC). However, due to the impacts of the hardware imperfections and the propagation environment, perfect time synchronization is impossible. More seriously, the time-varying SI propagation channel aggravates the difficulty of time synchronization. To overcome the above problems, a time-robust digital SIC (TR-DSIC) is proposed in this paper, as a novel scheme to address the time synchronization error (timing error). Firstly, by comprehensively considering nonlinear distortion and multipath propagation with different time delays and time-varying gains, a revised general memory polynomial (RGMP) model of the received SI is presented. Then, based on the RGMP model of the received SI, the TR-DSIC is proposed to cancel the SI in the digital domain, which is robust to arbitrary timing error and no need additional processing for it. Finally, the performance of the proposed TR-DSIC is analyzed under imperfect estimations of the polynomial coefficients. The analytical expression of the variance of the estimation error is presented here, and the closed-form expression of the residual SI power introduced by imperfect estimations of the polynomial coefficients is derived. Simulation results reveal that the TR-DSIC is capable of eliminating the influence of arbitrary timing error. Specially, when the maximum timing error is 0.5T s for the SI multipath channel, the TR-DSIC outperforms the traditional DSIC without considering the timing error between the reconstructed and received SI by 5.2 dB. INDEX TERMS Full-duplex, self-interference cancellation, timing error, nonlinear distortion, multipath.

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Section: A Effect Of Nonlinear Distortionmentioning

confidence: 99%

A Time-Robust Digital Self-Interference Cancellation in Full-Duplex Radios: Receiver Design and Performance Analysis

Zhao

Guo

et al. 2020

IEEE Access

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“…Thus, the clustering and warping induced by nonlinear distortion was modeled by utilizing improved loglikelihood ratio computation based on bivariate Gaussian function, and a transmitter‐based predistortion and receiver‐based soft cancellation were combined to minimize nonlinear distortion 12 . To reduce the computation complexity, a digital predistortion method was proposed to compensate for the distortion of the traveling wave tube amplifier (TWTA) and OMUX filter in the satellite channel 13 . The work presented in this article will also be performed based on a TWTA with OFDM as driving signal.…”

Section: Introductionmentioning

confidence: 99%

Theory and experiments of a low sampling frequency broadband digital predistortion with cyclostationarity

Lan

Wang

et al. 2020

Satell Commun Network

Self Cite

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To reduce the sampling rate from analog to digital converter for the feedback loop of digital predistortion (DPD) in a microwave power amplifier (MPA), a model was proposed and used to obtain the formulae for the cyclostationarity of the digital modulation signal, which shows that the nonlinear parameter of the MPA model is only determined by the correlation matrix of the signal and can be estimated with the under-sampled output signal. The output signal of the MPA, similar to a high sampling rate, can be recovered by combining the nonlinear parameter with the input signal. Then the DPD of the MPA is implemented through indirect learning architecture to realize its linearization. A Ka-band traveling wave tube amplifier is used to the circuit for performing a low sampling rate DPD process to validate the rationality of the proposed model and formulae.

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Transmission line fault classification based on spatiotemporal characteristic analysis with global and local discriminant analysis

Zhang,

Wang

2023

Engineering Science and Technology, an International Journal

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Predistortion With Low Feedback Sampling Rate for Wideband Nonlinear Satellite Downlinks

Cited by 4 publications

References 8 publications

A Time-Robust Digital Self-Interference Cancellation in Full-Duplex Radios: Receiver Design and Performance Analysis

A Time-Robust Digital Self-Interference Cancellation in Full-Duplex Radios: Receiver Design and Performance Analysis

Theory and experiments of a low sampling frequency broadband digital predistortion with cyclostationarity

Transmission line fault classification based on spatiotemporal characteristic analysis with global and local discriminant analysis

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