A tunable pre-distorter for linearization of solid state power amplifier in mobile wireless OFDM

One of the major problems posed by orthogonal frequency division multiplexing (OFDM) is its high peak-to-average-power ratio (PAPR), which seriously limits the power efficiency of the solid state power amplifier (SSPA) because of the nonlinear distortion caused by high PAPR. In the present paper, we describe an analytical design approach that uses a sparse and yet accurate model for the pre-distorter (PD) based on the SSPA characteristics. Furthermore, the PD configuration is self-tuning, i.e., it can automatically re-adjust itself by tracking changes in the SSPA characteristics with very few (typically two) training symbols.

[1]  Yong Soo Cho,et al.  An adaptive data predistorter for compensation of nonlinear distortion in OFDM systems , 1997, IEEE Trans. Commun..

[2]  Byung Moo Lee,et al.  Adaptive Predistorters for Linearization of High-Power Amplifiers in OFDM Wireless Communications , 2006 .

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

[4]  Yong Soo Cho,et al.  On compensating nonlinear distortions of an OFDM system using an efficient adaptive predistorter , 1999, IEEE Trans. Commun..

[5]  Edward J. Powers,et al.  A compensation scheme for nonlinear distortion in OFDM systems , 2000, Globecom '00 - IEEE. Global Telecommunications Conference. Conference Record (Cat. No.00CH37137).

[6]  Taewon Hwang,et al.  An adaptive pre-distorter for the compensation of HPA nonlinearity , 2000, IEEE Trans. Broadcast..

[7]  Americo Brajal,et al.  Compensation of nonlinear distortions for orthogonal multicarrier schemes using predistortion , 1994, 1994 IEEE GLOBECOM. Communications: The Global Bridge.

[8]  C. Rapp,et al.  Effects of HPA-Nonlinearity on a 4-DPSK/OFDM-Signal for a Digital Sound Broadcasting System. , 1991 .

[9]  Joseph R. Cavallaro,et al.  Enhanced power efficiency of mobile OFDM radio using predistortion and post-compensation , 2002, Proceedings IEEE 56th Vehicular Technology Conference.

[10]  R.J.P. de Figueiredo,et al.  Adaptive input-power processing for mitigation of PAPR in OFDM , 2005, 2005 IEEE 7th CAS Symposium on Emerging Technologies: Circuits and Systems for 4G Mobile Wireless Communications.