Patents by Inventor Jussi H. Vepsalainen

Jussi H. Vepsalainen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Signal predistortion in radio transmitter
    Patent number: 7742748
    Abstract: A transmission signal to be transmitted from a radio transmitter is predistorted in order to compensate for the signal distortion caused by a power amplifier. The transmission signal and a signal modeling a power supply voltage applied to the power amplifier are compared with distortion properties of the power amplifier using these signals. The distortion information is comprised in an amplitude distortion lookup table and a phase distortion lookup table. Transmission signal and power supply signal values are associated with envelope and phase predistortion information comprised in the respective lookup tables and the envelope and the phase of the transmission signal is predistorted accordingly.
    Type: Grant
    Filed: January 25, 2007
    Date of Patent: June 22, 2010
    Assignee: Nokia Corporation
    Inventors: Jorma Matero, Marko J. Alanen, Jussi H. Vepsäläinen, Jaako Maunuksela
  • Signal predistortion in radio transmitter
    Publication number: 20080139140
    Abstract: A transmission signal to be transmitted from a radio transmitter is predistorted in order to compensate for the signal distortion caused by a power amplifier. The transmission signal and a signal modeling a power supply voltage applied to the power amplifier are compared with distortion properties of the power amplifier using these signals. The distortion information is comprised in an amplitude distortion lookup table and a phase distortion lookup table. Transmission signal and power supply signal values are associated with envelope and phase predistortion information comprised in the respective lookup tables and the envelope and the phase of the transmission signal is predistorted accordingly.
    Type: Application
    Filed: January 25, 2007
    Publication date: June 12, 2008
    Inventors: Jorma Matero, Marko J. Alanen, Jussi H. Vepsalainen, Jaako Maunuksela