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

Claim 0:
1. A receiver system comprising:
a matched filter bank;
decision logic; and
a frequency offset estimator,, wherein:
the matched filter bank comprises an input for receiving data representative of a frequency- or phase-modulated signal;
the decision logic is configured to generate a sequence of demodulated symbol values from outputs of the matched filter bank;
the frequency offset estimator is configured to:
determine a first phase value from a first output of the matched filter bank;
determine 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;
determine 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
generate a frequency offset estimate by 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.