Method and apparatus for receiver frequency error compensation

摘要

This disclosure presents a receiver apparatus (10) and corresponding method that advantageously use ISI-canceling combining weights, as are generated for ISI suppression in the receiver's data signal combining operations, to suppress the effects of ISI from determinations of receiver frequency error. Such suppression yields more accurate receiver frequency error determination and, correspondingly, improved receiver frequency error compensation.

主权项

1. A method of correcting for receiver frequency error in an inter-symbol interference (ISI) canceling receiver that is configured to generate ISI-canceling combining weights in each reception time slot for combining received signal values in the reception time slot, said method comprising:
de-rotating received signal values for demodulation processing by an amount corresponding to a determined receiver frequency error; calculating phase changes between reception time slots by, for any given pair of current and prior reception time slots, calculating the phase change as a function of the combining weights determined in one of the reception time slots in said given pair and pilot values or corresponding channel estimates for the other one of the reception time slots in said given pair; and determining the receiver frequency error, as used for de-rotating the received signal values, as a function of the calculated phase changes.