Apparatus, and associated method, for estimating frequency offset of a data symbol communicated in a communication system
AssigneeNokia Corporation
InventorJan C. Olivier
Life of this patent
Estimating the term…
Abstract
Apparatus, and an associated method, for estimating frequency offset introduced upon symbols of a sequence communicated by a sending station to a data destination during operation of a communication system. A received sequence is rotated by multiplying the symbols thereof by offset values selected from a set of offset values. Then, for each rotated sequence, an estimation of a data sequence is made. Noise indicia associated with each estimated data sequence is calculated. And, comparisons are made of the noise indicia associated with each of the estimated data sequences. Responsive to the comparisons, selection is made of the frequency offset that has been introduced upon the data sequence.
Claims20
In a communication system in which a data sequence, formed of initial data symbol values, is communicated upon a communication channel to a receiving station, an improvement of apparatus for estimating, responsive to received data symbol values, received at the receiving station, frequency offset of the received data symbols, said apparatus comprising:
- a first-stage data value determiner coupled to receive indications of the data symbol values received at the receiving station, said first-stage data-value determiner for determining a first, first-stage estimate of the data sequence and at least a second, first-stage estimate of the data sequence;
- a noise indicia calculator coupled to said first-stage data-value determiner, said noise indicia calculator for calculating a noise indicia associated with each first-stage estimate formed by said data-value determiner;
- and
- a selector coupled to receive values of the noise indicia calculated by said noise indicia calculator, said selector for selecting a selected one of first and at least second, first-stage estimates, respectively, to be the frequency offset of the receiving data symbols.
In a method for communicating in a communication system in which a data sequence, formed of initial symbol values, is communicated upon a communication channel to a receiving station, an improvement of a method for estimating, responsive to received symbol values received at the receiving station, a frequency offset of the received symbols of the data sequence, said method comprising:
- determining a first, first-stage estimate of the data sequence and at least a second, first-stage estimate of the data sequence;
- calculating a noise indicia associated with each first-stage estimate formed during said operation of determining;
- and
- selecting a selected one of the first and at least second first-stage estimates, respectively, to be the frequency offset of the data symbols of the data sequence.
Dependencies are inferred from the claim text.