Patents by Inventor Ralf Heddergott

Ralf Heddergott 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).

  • Maximum likelihood estimation of the channel coefficients and of the DC offset in a digital baseband signal of a radio receiver using the SAGE algorithm
    Patent number: 7340257
    Abstract: The proposed iterative method concurrently calculates maximum likelihood estimated values for the channel coefficients (h0, . . . , hL; ?h) and the DC offset (d; ?d) on the basis of a training sequence (TSC) in a TDMA mobile communications system. The SAGE algorithm leads to two recursion formulae, by means of which the iterative calculation of estimated values for the channel coefficients (h0, . . . , hL; ?h) and for the DC offset (d; ?d) is provided.
    Type: Grant
    Filed: July 29, 2005
    Date of Patent: March 4, 2008
    Assignee: Infineon Technologies AG
    Inventors: Ralf Heddergott, Claudiu Krakowski, Martin Krüger
  • Method and apparatus for correlative estimation of a mobile radio channel
    Patent number: 7310395
    Abstract: In a method for correlative estimation of a mobile radio channel on the basis of a training sequence (TS) which is transmitted via the mobile radio channel, a sequence of P received symbols is correlated with a subsequence of length P of the training sequence, in order to calculate a first estimated channel coefficient (?0(1)). Furthermore, the same sequence of P received symbols is correlated with at least some of the subsequences of the training sequence (TS) shifted through ±1, ±2, . . . , ±(Lt?1) symbol positions, in order to calculate a number of further estimated channel coefficients (?±1(1),?±2(1), . . . ,?±(Lt?1)(1)).
    Type: Grant
    Filed: April 28, 2004
    Date of Patent: December 18, 2007
    Assignee: Infineon Technologies AG
    Inventors: Martin Krüger, Ralf Heddergott, Claudiu Krakowski
  • Maximum likelihood estimation of the channel coefficients and of the DC offset in a digital baseband signal of a radio receiver using the sage algorithm
    Publication number: 20060052062
    Abstract: The proposed iterative method concurrently calculates maximum likelihood estimated values for the channel coefficients (h0, . . . , hL; ?h) and the DC offset (d; ?d) on the basis of a training sequence (TSC) in a TDMA mobile communications system. The SAGE algorithm leads to two recursion formulae, by means of which the iterative calculation of estimated values for the channel coefficients (ho, . . . , hL; ?h) and for the DC offset (d; ?d) is provided.
    Type: Application
    Filed: July 29, 2005
    Publication date: March 9, 2006
    Inventors: Ralf Heddergott, Claudiu Krakowski, Martin Kruger
  • Method and apparatus for correlative estimation of a mobile radio channel
    Publication number: 20040218703
    Abstract: In a method for correlative estimation of a mobile radio channel on the basis of a training sequence (TS) which is transmitted via the mobile radio channel, a sequence of P received symbols is correlated with a subsequence of length P of the training sequence, in order to calculate a first estimated channel coefficient (ĥ0(1)). Furthermore, the same sequence of P received symbols is correlated with at least some of the subsequences of the training sequence (TS) shifted through ±1, ±2, . . . , ±(Lt−1) symbol positions, in order to calculate a number of further estimated channel coefficients (ĥ±1(1),ĥ±2(1), . . . ,ĥ±(Lt−1)(1)).
    Type: Application
    Filed: April 28, 2004
    Publication date: November 4, 2004
    Inventors: Martin Kruger, Ralf Heddergott, Claudiu Krakowski