Patents by Inventor Karl Kammeyer

Karl Kammeyer 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).

  • Preamble for estimation and equalization of asymmetries between inphase and quadrature branches in multicarrier transmission systems
    Publication number: 20050180518
    Abstract: Distortions of radio signals transmitted in data blocks in an OFDM method, the distortions being caused by IQ asymmetries, can be estimated and subsequently equalized by means of specific reference data symbols which are transmitted at the transmitter end and may be part of a preamble. The method can be used particularly advantageously in a direct-mixing receiver.
    Type: Application
    Filed: March 8, 2005
    Publication date: August 18, 2005
    Inventors: Lars Brotje, Karl Kammeyer, Volker Kuhn, Sven Vogeler
  • Iterative estimation and equalization of asymmetries between inphase and quadrature branches in multicarrier transmission systems
    Publication number: 20050180534
    Abstract: Distortions of radio signals transmitted in data blocks in an OFDM method, the distortions being caused by transmitter- or receiver-end IQ asymmetries and by channel distortion, can be estimated and equalized by means of an iteration method. The method can be used particularly advantageously in a direct-mixing receiver.
    Type: Application
    Filed: March 8, 2005
    Publication date: August 18, 2005
    Inventors: Lars Brotje, Sven Vogeler, Volker Kuhn, Karl Kammeyer