The Christian Doppler Laboratory for Nonlinear Signal Processing addresses fundamental research questions arising from signal processing applications which are challenging due to their nonlinear aspects. We deliver theoretical analyses, develop and optimize new algorithms and, through their implementation, build awareness for their complexity, robustness, accuracy, and power consumption trade-offs. The Laboratory plays a leading role in the solution of signal processing problems where conventional methods fail. By entering into industrial partnerships, it thrives from and supports the bidirectional exchange of know-how and people between nonlinear science and the sweeping digital signal processing revolution. The Christian Doppler Laboratory is hosted by the
SPSC Lab at TU Graz and receives support from the Christian Doppler Research Association and its industrial cooperation partners Infineon Technologies Villach and Austrian Research Centers ARC Vienna (now Austrian Institute of Technology AIT). In 2007, it was among the first labs to open an international branch at Leibniz University Hannover, headed by Ilona Rolfes who brings her specific competence in radio-frequency engineering to the industrial collaborations.

The research modules of the laboratory are:

• Identification and equalization of nonlinearities in digital subscriber lines (xDSL)
• Digital correction of analog signal processing errors in fast time-interleaved analog-to-digital converters
• Digital predistortion of RF power amplifiers for UMTS Base-Stations
• Ultra Wideband Communications (UWB)
• Digital synthesizers for gigahertz-range fast frequency-hopping systems (all-digital phase locked loops)
• Reconfigurable radio frontends for wireless multistandard terminals with integrated antennas (implemented at the international branch in at Leibniz University Hannover/Germany)