Patent ID: 11962443
Assignee: NORDIC SEMICONDUCTOR ASA
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 19:
20. A method of estimating a frequency offset in a receiver system that is configured to:
provide data representative of a frequency- or phase-modulated signal to a matched filter bank; and
generate a sequence of demodulated symbol values from outputs of the matched filter bank,
the method comprising:
determining a first phase value from a first output of the matched filter bank;
determining a second phase value from a second output of the matched filter bank, wherein the second output is offset from the first output by an offset number, L, of symbol periods;
determining a phase adjustment value from an L-symbol subsequence within the sequence of demodulated symbol values, wherein each of the L symbol values is determined at least in part from a respective one or more values output by the matched filter bank during a time interval from the first output to the second output; and
estimating a frequency offset in dependence on the difference between i) the first phase value plus the phase adjustment value and ii) the second phase value.