Patents Assigned to Wirless Facilities, Inc.
  • Patent number: 6359878
    Abstract: A system and method of timing estimation for use in a digital receiver within a communication system. A timing estimation block is provided within a digital receiver, where the input signal is processed at four or more samples per symbol and the estimation block operates in a feedforward manner. The algorithm calculates the timing offset by evaluating the spectral component at the symbol clock frequency. The spectral component is generated using a nonlinearity operation. However, the maximum likelihood non-data-aided timing estimation equation reveals an alternative approximation for the logarithm of the hyperbolic cosine function present in the maximum likelihood equation, which offers an excellent compromise between implementation complexity and variance performance. The estimated timing offset is then fed to a timing correction unit, which calculates the data samples corresponding to the sampling clock phase and removes the redundant samples.
    Type: Grant
    Filed: July 20, 1998
    Date of Patent: March 19, 2002
    Assignee: Wirless Facilities, Inc.
    Inventors: Ismail Lakkis, Deirdre O'Shea, Masood K. Tayebi, Baya Hatim