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  • Systems and methods for improving reference signals for spatially multiplexed cellular systems
    Patent number: 8116691
    Abstract: A method for using a numerical method to design reference signals for multiple input multiple output (MIMO) systems is described. An input multiple input multiple output signal is determined. A nearest tight frame to one or more given structured vectors is obtained. One or more structured vectors from the nearest tight frame are obtained. The one or more structured vectors are projected onto the space of circulant matrices. One or more classes of matrices associated with reference signals are outputted.
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: February 14, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventor: John M. Kowalski
  • Apparatus and method for channel estimation in a mobile communication system
    Patent number: 8045451
    Abstract: An apparatus and a method for estimating a Channel Impulse Response (CIR) with respect to a location where a power of a channel exists are provided to enhance a channel estimator in a mobile communication system. The apparatus includes a CIR searcher for selecting a CIR group that is a region where a channel power exists, a CIR estimation part for estimating a CIR of the selected CIR group, and a Discrete Fourier Transform (DFT) for performing a DFT on the estimated CIR.
    Type: Grant
    Filed: July 1, 2009
    Date of Patent: October 25, 2011
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Sung-Soo Kim, Jeong-Soon Park, Huiqiang Zhou