Patent ID: 7035364

Claim:
A digital receiver fast frequency and time acquisition system comprising: a first channel select (CS) filter filtering an incoming digital baseband signal; a frame synchronization detector for recognizing a single time synchronization word from the first filtered signal; a coarse symbol time estimator for coarsely determining the symbol time synchronization of the digital signal using the single time synchronization word after the frame synchronization detection; a fine frequency estimator for finely determining the frequency error of the signal using the single time synchronization word after the coarse symbol time estimation for providing a frequency adjustment signal; a mixer for combining the incoming digital baseband signal with the frequency adjustment signal and providing a frequency corrected digital signal; a second CS filter for filtering the frequency corrected digital signal; a fine symbol time estimator for determining symbol timing with greater precision of the filtered signal from the second CS filter using the single time synchronization word; a symbol detector for interpreting the digital signal after the fine symbol time estimation; and wherein the system operates without the use of an automatic frequency control.