Systems and methods for improving timing phase estimation
Systems and methods are provided for performing the required phase calculation in a telecommunications system in order to optimize system performance more quickly and with reduced complexity as compared to prior approaches to solving this problem. In accordance with the preferred exemplary embodiment of the present invention, the phase delay of the precursor EQ is utilized for estimating the entire DFE phase shift by calculating the estimation exclusively based on an output of the precursor EQ this estimation is then used for adjusting the timing phase based on the phase estimation.
1. A method of determining a desired timing phase in a communications device comprising the steps of:
establishing a normal connection and saving all converged precursor fractionally spaced equalizer coefficients from the normal connection;
estimating a subsequent entire DFE phase shift by calculating the estimation exclusively based on an output of a precursor equalizer using the saved converged precursor fractionally spaced equalizer coefficients; and
adjusting the timing phase based on the phase estimation.
2. A communications device allowing optimal timing phase comprising a digital signal processor including:
a precursor equalizer providing a signal for phase estimation;
a timing interpolator coupled to the precursor equalizer;
a postcursor equalizer;
an adder coupled to the outputs of the precursor equalizer, timing interpolator and postcursor equalizer; and
a summing device providing a DFE output coupled to the adder, wherein the digital signal processor saves all converged precursor fractionally spaced equalizer coefficients from a normal connection and estimates a DFE phase shift by calculating the estimation exclusively based on the precursor equalizer output using the saved converged precursor fractionally spaced equalizer coefficients; and adjusts the timing phase based on the phase estimation.