Integrated kalman filter-based phase-locked loop and viterbi equalizer

Abstract

A technique for reducing inter-symbol interference, frequency offset, and phase offset in a demodulator of a wireless communications system includes integrating a Kalman filter-based phase-locked loop (PLL) and a Viterbi equalizer. The integrated Kalman filter-based PLL and Viterbi equalizer includes a Kalman filter-based PLL that provides a frequency or phase offset corrected signal to a modified Viterbi equalizer and receives a reference signal for use in determining phase error. In an embodiment, the reference signal is based on an instant decision of the modified Viterbi equalizer rather than waiting for an entire traceback length of time to receive a Maximum Likelihood Sequence Estimation (MLSE) equalized symbol for use as the reference symbol by the Kalman filter-based PLL.

Dependencies are inferred from the claim text.