Patents by Inventor Jarkko Kesti

Jarkko Kesti 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).

  • Waveforms for envelope tracking transmitter
    Patent number: 7551688
    Abstract: A method and device for improving the efficiency of an envelope tracking transmitter in which a power amplifier for coupling modulated signals in a carrier frequency to an antenna for transmission. The transmitter comprises a power supply for providing a supply voltage to the power amplifier, and a computation means for providing a waveform indicative of the envelope of the modulated signal to the power supply in order to modify the supply voltage. A lower limit is imposed to the waveform so that the supply voltage to the power supply is always greater than a predetermined value. Moreover, when information is transmitted in times slots which are started and ended by ramp periods, a constant signal, based on the root-mean-square value of the waveform, is used to modify the waveform so that the supply voltage to the power amplifier includes a constant voltage level in the ramp periods.
    Type: Grant
    Filed: April 18, 2002
    Date of Patent: June 23, 2009
    Assignee: Nokia Corporation
    Inventors: Jorma Matero, Jarkko Kesti
  • Reconfigurable transmitter
    Publication number: 20070014382
    Abstract: A transmission device and method are shown, wherein an amplification is implemented which can be changed between a switched operation mode and linear operation mode as desired, depending on which mode of operation best meets the needs of the radio system in use. This opens the possibility of using the same hardware for different systems.
    Type: Application
    Filed: July 15, 2005
    Publication date: January 18, 2007
    Inventors: Niall Shakeshaft, Esko Jarvinen, Marko Alanen, Vlad Grigore, Jorma Matero, Jarkko Kesti
  • Waveforms for envelope tracking transmitter
    Publication number: 20030198300
    Abstract: A method and device for improving the efficiency of an envelope tracking transmitter in which a power amplifier for coupling modulated signals in a carrier frequency to an antenna for transmission. The transmitter comprises a power supply for providing a supply voltage to the power amplifier, and a computation means for providing a waveform indicative of the envelope of the modulated signal to the power supply in order to modify the supply voltage. A lower limit is imposed to the waveform so that the supply voltage to the power supply is always greater than a predetermined value. Moreover, when information is transmitted in times slots which are started and ended by ramp periods, a constant signal, based on the root-mean-square value of the waveform, is used to modify the waveform so that the supply voltage to the power amplifier includes a constant voltage level in the ramp periods.
    Type: Application
    Filed: April 18, 2002
    Publication date: October 23, 2003
    Applicant: Nokia Corporation
    Inventors: Jorma Matero, Jarkko Kesti