Patents Assigned to InterDigital Technology Coporation
  • Patent number: 7813735
    Abstract: A method and apparatus for performing a power efficient cell search in a multi-cell wireless communication system are disclosed. A wireless transmit/receive unit (WTRU) having a memory that stores a cell identification list of prioritized previously top-ranked cell identities (IDs) is used to perform the cell search. A primary synchronization code (PSC) correlation peak location on a received signal is selected. A common pilot channel (CPICH) correlation value is determined by non-coherent integration of a local signal created based on a first cell ID on the cell identification list to the received signal. If the CPICH correlation value is greater than a noise threshold, thus indicating that the first cell ID is a newly found cell ID, or if a last cell ID in the cell identification list is reached, an additional determination is made as to whether there is more than one cell ID on the list having the same timing.
    Type: Grant
    Filed: March 20, 2007
    Date of Patent: October 12, 2010
    Assignee: InterDigital Technology Coporation
    Inventors: Frederic Monfet, Alpaslan Demir, Mark L. Richards
  • Patent number: 7110386
    Abstract: A code division multiple access user equipment is used in receiving a plurality of data signals over a shared spectrum. Each received data signal experiences a similar channel response. A combined signal of the received data signals is received over a shared spectrum. The combined signal is sampled at a multiple of the chip rate. A channel response is estimated. A first element of a spread data vector is determined using the combined signal samples and the estimated channel response. A factor from the first element determination is used to determine remaining elements of the spread data vector. Data of the data signals is estimated using the determined elements of the spread data vector.
    Type: Grant
    Filed: February 21, 2002
    Date of Patent: September 19, 2006
    Assignee: InterDigital Technology Coporation
    Inventors: Parthapratim De, Ariela Zeira, Jung-Lin Pan, Raj Mani Misra
  • Patent number: 6006174
    Abstract: The generation of multipulse excitation codes by digitizing an original speech, partitioning the digitized signal into a number of samples, pre-emphasizing the samples, producing linear predictive reflection coefficients from said samples, quantizing these reflection coefficients, converting the quantized reflection coefficients to spectral coefficients and subjecting the spectral coefficients to pitch analysis to obtain a spectral residual signal.
    Type: Grant
    Filed: October 15, 1997
    Date of Patent: December 21, 1999
    Assignee: InterDigital Technology Coporation
    Inventors: Daniel Lin, Brian M. McCarthy