Patents by Inventor Tharaka Lamahewa

Tharaka Lamahewa 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).

  • Method and an apparatus for estimating a delay spread of a multipath channel
    Patent number: 7957481
    Abstract: Low complex algorithms for estimating a delay spread or a RMS delay spread of a multipath channel using channel estimates are disclosed, leading to low overall power consumption. According to an embodiment of the present invention, a delay spread or a RMS delay spread of the multipath channel is determined based on a metric calculated as a function of channel estimates. In another embodiment, an average signal to noise ratio is taken into consideration in addition to the metric to estimate the delay spread or the RMS delay spread. In a further embodiment, the delay spread or the RMS delay spread of the multipath channel is estimated based on an average signal to noise ratio and on a metric being a function of the slope between subcarrier channel estimates. The present invention further relates to an apparatus for estimating a delay spread or a RMS delay spread of the multipath channel.
    Type: Grant
    Filed: April 26, 2007
    Date of Patent: June 7, 2011
    Assignee: Nanoradio AB
    Inventors: Magnus Nilsbo, Tharaka Lamahewa, Scott Leyonhjelm
  • METHOD AND AN APPARATUS FOR ESTIMATING A DELAY SPREAD OF A MULTIPATH CHANNEL
    Publication number: 20100085865
    Abstract: Low complex algorithms for estimating a delay spread or a RMS delay spread of a multipath channel using channel estimates are disclosed, leading to low overall power consumption. According to an embodiment of the present invention, a delay spread or a RMS delay spread of the multipath channel is determined based on a metric calculated as a function of channel estimates. In another embodiment, an average signal to noise ratio is taken into consideration in addition to the metric to estimate the delay spread or the RMS delay spread. In a further embodiment, the delay spread or the RMS delay spread of the multipath channel is estimated based on an average signal to noise ratio and on a metric being a function of the slope between subcarrier channel estimates. The present invention further relates to an apparatus for estimating a delay spread or a RMS delay spread of the multipath channel.
    Type: Application
    Filed: April 26, 2007
    Publication date: April 8, 2010
    Inventors: Magnus Nilsbo, Tharaka Lamahewa, Scott Leyonhjelm