Broadband power amplifier nonlinearity cancellation in OFDM systems

S. WERNER; F.H. GREGORIO; J. E. COUSSEAU; J.L. FIGUEROA; R.WICHMAN

Acta Technica Napocensis, Electronics and Telecommunications

Technical University of Cluj-Napoca, Faculty of Electronics, Telecommunications and Information Technology

Lugar: Bucarest; Año: 2008 vol. 49 p. 19 - 22

1221-6542

One drawback of OFDM systems is the high peak-to-average power ratio, which imposes strong requirements on the linearity of power amplifiers (PAs). Such linearity requirements translate into high back-off that results in low power efficiency. In order to improve power efficiency, a PA nonlinearity cancellation (PANC) technique is introduced which reduces the nonlinear distortion effects on the received signal. In order to deal with broadband high-power PA (HPA) distortion, the PANC technique employs aWiener-Hammerstein model. Simulation results show that good levels of distortion cancellation are possible for a system with a nonlinear HPA with memory.