Nonlinearity estimation in power amplifiers based on subsampled temporal data

In this paper we apply subsampling techniques to capture the temporal input-output relationship of RF power amplifiers. This approach avoids the distortion introduced by the upconverter and downconverter stages. We develop polynomial models with memory from the available data and evaluate their performance by estimating device parameters such as adjacent channel power ratio and AM-AM curves. The estimated parameters show good agreement with the empirical ones.

[1]  Wlodzimierz Greblicki,et al.  Nonlinearity estimation in Hammerstein systems based on ordered observations , 1996, IEEE Trans. Signal Process..

[2]  J. A. Wepman,et al.  Analog-to-digital converters and their applications in radio receivers , 1995, IEEE Commun. Mag..

[3]  Muhammad Taher Abuelma'atti,et al.  Frequency-Dependent Nonlinear Quadrature Model for TWT Amplifiers , 1984, IEEE Trans. Commun..

[4]  W.H. Tranter,et al.  Simulation of communication systems , 1994, IEEE Communications Magazine.

[5]  Jacques Sombrin,et al.  Neural network modeling and identification of nonlinear channels with memory: algorithms, applications, and analytic models , 1998, IEEE Trans. Signal Process..

[6]  M. S. Heutmaker.  The error vector and power amplifier distortion , 1997, Proceedings of 1997 Wireless Communications Conference.

[7]  Adel A. M. Saleh,et al.  Frequency-Independent and Frequency-Dependent Nonlinear Models of TWT Amplifiers , 1981, IEEE Trans. Commun..

[8]  Rodney G. Vaughan,et al.  The theory of bandpass sampling , 1991, IEEE Trans. Signal Process..

[9]  Rodnay Zaks,et al.  A/D and D/A conversion , 1978, Microprocess..

[10]  Michael S . Heutmaker,et al.  Envelope Distortion Models with Memory Improve the Prediction of Spectral Regrowth for Some RF Amplifiers , 1996, 48th ARFTG Conference Digest.

[11]  H. B. Poza,et al.  A wideband data link computer simulation model , 1978 .

[12]  W.E. Stark,et al.  Nonlinear effects of power amplification on multicarrier spread spectrum systems , 1998, 1998 IEEE MTT-S International Microwave Symposium Digest (Cat. No.98CH36192).

[13]  C. J. Clark,et al.  Time-domain envelope measurement technique with application to wideband power amplifier modeling , 1998 .