Patent ID: 6366629
Filing Date: 2002-04-02
Classification: H04L,H04N

Abstract:
A method of estimating symbol timing phase and rate offsets in signal samples having repetitive symbol sync sequences representative of a digitally modulated radio frequency signal generated by a transmission system having a transmitter and a receiver with an overall system response implemented with serially coupled transmitter and receiver filters for avoiding system generated intersymbol interference, comprising the steps of:(a) processing the signal samples for producing filtered signal samples within selected subranges of a block of the signal samples containing the symbol sync sequences; (b) generating symbol timing phase and rate offset values using the filtered signal samples in the selected subranges; (c) resampling the filtered signal samples in the selected subranges using an interpolating filter having filter coefficients derived from the symbol timing phase and rate offset values; and (d) repeating steps (b) and (c) with the generating step calculating updated symbol timing phase and rate offset values from the resampled filtered signal samples for deriving updated filter coefficients for the resampling process until a limit value is reached.