Patents by Inventor Panayiotis D. Papadimitriou

Panayiotis D. Papadimitriou 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: 7616609
    Abstract: Apparatus, and an associated method, for designing codes to be used to code data that is communicated in a multi-access communication system. A selected code is designed, based upon an initial code. The selected code that is designed is of characteristics that best optimize channel differentiation to minimize interference between concurrently-communicated data coded by different codewords of the selected code.
    Type: Grant
    Filed: February 11, 2004
    Date of Patent: November 10, 2009
    Assignee: Nokia, Inc.
    Inventors: Panayiotis D. Papadimitriou, Costas N. Georghiades
  • Patent number: 7333575
    Abstract: A receiver, a system, and an associated method, for receiving a radio signal carrying transmitted data that is subject to distortion in the transmission channel. The receiver includes a plurality of stages that perform parallel interference cancellation (PIC) with respect to a received space-time transmit diversity (STTD) signal to establish successively more accurate estimates of the transmitted data, including a receiver first stage being a RAKE-STTD receiver, a second stage including an minimum mean-square error (LMMSE) equalizer, and preferably a third stage also including an LMMSE. Each stage processes the estimates of the transmitted signal provided by the stage preceding it, as well as the received signal, to mitigate or eliminate as much transmission-channel interference as possible and provide a refined estimate for processing by subsequent stages. Improved channel estimation may be achieved by processing the pilot signal in similar fashion as well.
    Type: Grant
    Filed: December 5, 2003
    Date of Patent: February 19, 2008
    Assignee: Nokia Corporation
    Inventors: Panayiotis D. Papadimitriou, Prabodh Varshney
  • Patent number: 7313168
    Abstract: A hybrid receiver, and an associated method, for receiving a radio signal carrying transmitted data that is subject to distortion in the transmission channel. The receiver includes a plurality of stages that perform parallel interference cancellation (PIC) to establish successively more accurate estimates of the transmitted data, including a receiver first stage being either a RAKE receiver or a linear minimum mean-square error (LMMSE) receiver, a second stage including an LMMSE, and preferably a third stage also including an LMMSE. Each stage processes the estimates of the transmitted signal provided by the stage preceding it to mitigate or eliminate as much transmission-channel interference as possible and prove a refined estimate for processing by subsequent stages. Improved channel estimation may be achieved by processing the pilot signal in similar fashion as well.
    Type: Grant
    Filed: March 24, 2003
    Date of Patent: December 25, 2007
    Assignee: Nokia Corporation
    Inventors: Panayiotis D. Papadimitriou, Prabodh Varshney, Mohammad Jaber Borran
  • Publication number: 20040190601
    Abstract: A hybrid receiver, and an associated method, for receiving a radio signal carrying transmitted data that is subject to distortion in the transmission channel. The receiver includes a plurality of stages that perform parallel interference cancellation (PIC) to establish successively more accurate estimates of the transmitted data, including a receiver first stage being either a RAKE receiver or a linear minimum mean-square error (LMMSE) receiver, a second stage including an LMMSE, and preferably a third stage also including an LMMSE. Each stage processes the estimates of the transmitted signal provided by the stage preceding it to mitigate or eliminate as much transmission-channel interference as possible and prove a refined estimate for processing by subsequent stages. Improved channel estimation may be achieved by processing the pilot signal in similar fashion as well.
    Type: Application
    Filed: March 24, 2003
    Publication date: September 30, 2004
    Inventors: Panayiotis D. Papadimitriou, Prabodh Varshney, Mohammad Jaber Borran
  • Publication number: 20040176051
    Abstract: A receiver, a system, and an associated method, for receiving a radio signal carrying transmitted data that is subject to distortion in the transmission channel. The receiver includes a plurality of stages that perform parallel interference cancellation (PIC) with respect to a received space-time transmit diversity (STTD) signal to establish successively more accurate estimates of the transmitted data, including a receiver first stage being a RAKE-STTD receiver, a second stage including an minimum mean-square error (LMMSE) equalizer, and preferably a third stage also including an LMMSE. Each stage processes the estimates of the transmitted signal provided by the stage preceding it, as well as the received signal, to mitigate or eliminate as much transmission-channel interference as possible and prove a refined estimate for processing by subsequent stages. Improved channel estimation may be achieved by processing the pilot signal in similar fashion as well.
    Type: Application
    Filed: December 5, 2003
    Publication date: September 9, 2004
    Inventors: Panayiotis D. Papadimitriou, Prabodh Varshney
  • Publication number: 20030161258
    Abstract: Apparatus, and an associated method, for a multiple-input, multiple-output communication system having M transmit antennas and N receive antennas. Apparatus is provided for the receiving station including processing elements permitting joint interference cancellation and prefiltering of data received at the receiving station. Additional joint encoding apparatus is provided for a sending station of the MIMO communication system together with corresponding decoding apparatus of the receiving station.
    Type: Application
    Filed: February 22, 2002
    Publication date: August 28, 2003
    Inventors: Jianzhong Zhang, Panayiotis D. Papadimitriou, Prabodh Varshney
  • Publication number: 20030081569
    Abstract: A cellular communications system includes a plurality of mobile stations located within at least one cell; a base transceiver station (BTS) for servicing the cell; a base station controller (BSC) coupled to the BTS; and a Call Admission processor coupled to the BTS for receiving a call admission request from mobile stations located in the cell served by the BTS. The processor, which could be co-located with the BSC, grants cellular communications system resources to mobile stations based at least in part on a level of service required by the mobile stations and on a location of the mobile stations within the cell. For a mobile station having a high bandwidth requirement and that is determined to be located at the edge of the cell, the mobile station is preferentially granted system resources by being assigned a plurality of time slots per frame for forming one radio information block, and is operated with a non-convolutional modulation format and with turbo channel coding.
    Type: Application
    Filed: October 25, 2001
    Publication date: May 1, 2003
    Applicant: Nokia Corporation
    Inventors: Thomas A. Sexton, Panayiotis D. Papadimitriou, Hannu Vilpponen, Prabodh Varshney