Method and apparatus for estimating frequency errors

摘要

A frequency error embodied in a series of values is determined by processing each of two or more selected values with another value in the series, each other value being spaced from its respective selected value by a first spacing, to generate processed values that all comprise substantially the same phase component; combining the processed values to generate a combined value that comprises substantially the same phase component as the processed values; repeating the processing and combining with the same selected values but a second spacing, different from the first spacing, to generate a combined value comprising a different phase component from the combined value generated using the first spacing, reflecting the frequency error; and determining the frequency error in dependence on the combined values generated using the first and second spacings.

主权项

1. A method for wireless communication, the method comprising:
at a receiver, receiving a series of values, each output in the series comprising a different phase component from the one preceding it because of an unknown phase component introduced by a time-varying, rotation element due to a frequency error between a transmitter and the receiver; processing each of two or more selected values with another value in the series, each other value being spaced from its respective selected value by a first spacing, to generate a series of processed values that all comprise the same phase component; combining the series of processed values using differential coherent combining to generate a series of combined values that comprises the same phase component as the series of processed values; repeating the processing and combining with the same selected values but a second spacing, different from the first spacing, to generate a series of combined values comprising a different phase component from the series of combined values generated using the first spacing, reflecting the frequency error; and determining the frequency error in dependence on the series of combined values generated using the first and second spacings.