Patents by Inventor Pentti Leppanen

Pentti Leppanen 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).

  • Patent number: 5754541
    Abstract: A base station, subscriber terminal, and data transmission method in a CDMA cellular radio network having in each cell at least one base station which communicates on a specified traffic channel with the terminal equipments (Mobile Station) located within its area, the signal of the users being divided in the method into bursts in the time domain. To achieve high traffic capacity together with high-quality connections, the base station monitors the load state of the traffic channel in the data transmission method of the invention and transmits information about the load state of the traffic channel to the terminal equipments. In the method, the number of the bursts transmitted between the terminal equipments and the base stations per time unit is controlled on the basis of the delay state of the bursts and the load state information computed at the base station.
    Type: Grant
    Filed: April 19, 1996
    Date of Patent: May 19, 1998
    Assignees: Nokia Telecommunications Oy, Nokia Mobile Phones Ltd.
    Inventors: Savo Glisic, Ilkka Keskitalo, Pentti Leppanen, Tero Ojanpera, Juha Rapeli, Kari Rikkinen
  • Patent number: 5533013
    Abstract: The invention is a communication method with the equipment belonging to it and its aim is to increase the number of users in a network or cell. Data is transmitted by the method by using a combined CDMA/TDMA or TDMA/CDMA multiple use whereby complementary code sets (complete orthogonal codes or non-interacting codes) are used as spreading codes. In the applications of the method to existing or planned TDMA systems, a CDMA part is added to them, by which a spreading coded CDMA multiple access is used in every time slot of the TDMA frame, in said way, to increase the number of users. The described method does not require any power control methods, nor any multiple access interference cancelling methods to increase network or cell capacity.
    Type: Grant
    Filed: April 11, 1995
    Date of Patent: July 2, 1996
    Assignee: Nokia Mobile Phones Limited
    Inventor: Pentti Leppanen
  • Patent number: 5426670
    Abstract: A circuit arrangement is disclosed for reducing the adverse effects of interference in a signal of interest. The circuit arrangement includes a matched filter for receiving the signal of interest and a median filter coupled to the output of the matched filter. The median filtered output signal of the matched filter is utilized to remove interference, to calculate the threshold level, or to estimate the interference level at the output of the matched filter.
    Type: Grant
    Filed: July 15, 1993
    Date of Patent: June 20, 1995
    Assignee: Nokia Mobile Phones Ltd.
    Inventors: Pentti Leppanen, Jari Iinatti